B Michon; A B Kuzmenko; M K Tran; B McElfresh; S Komiya; S Ono; S Uchida; D van der Marel Spectral weight of hole-doped cuprates across the pseudogap critical point Journal Article Phys. Rev. Research, 3 , pp. 043125, 2021. @article{PhysRevResearch.3.043125, title = {Spectral weight of hole-doped cuprates across the pseudogap critical point}, author = {B Michon and A B Kuzmenko and M K Tran and B McElfresh and S Komiya and S Ono and S Uchida and D van der Marel}, url = {https://link.aps.org/doi/10.1103/PhysRevResearch.3.043125}, doi = {10.1103/PhysRevResearch.3.043125}, year = {2021}, date = {2021-11-01}, journal = {Phys. Rev. Research}, volume = {3}, pages = {043125}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Dirk van der Marel Tantalates Transcend Titanates Journal Article Journal Club for Condensed Matter Physics, 2021. @article{vanderMarel2021, title = {Tantalates Transcend Titanates}, author = {Dirk van der Marel }, editor = {Journal Club for Condensed Matter Physics}, url = {https://www.condmatjclub.org/uploads/2021/05/JCCM_May_2021_01.pdf}, doi = {https://doi.org/10.36471/JCCM_May_2021_01}, year = {2021}, date = {2021-06-01}, journal = {Journal Club for Condensed Matter Physics}, abstract = {Dirk van der Marel reports on recent additions to the numerous angels dancing on the head of a pin in the problem of superconductivity in lightly doped layers of SrTiO(3) and KTaO(3) which are near a ferroelectric quantum critical point at zero doping.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Dirk van der Marel reports on recent additions to the numerous angels dancing on the head of a pin in the problem of superconductivity in lightly doped layers of SrTiO(3) and KTaO(3) which are near a ferroelectric quantum critical point at zero doping. |
D Valentinis; J Zaanen; D van der Marel Propagation of shear stress in strongly interacting metallic Fermi liquids enhances transmission of terahertz radiation Journal Article Scientific Reports, 11 (1), 2021. @article{Valentinis2021, title = {Propagation of shear stress in strongly interacting metallic Fermi liquids enhances transmission of terahertz radiation}, author = {D Valentinis and J Zaanen and D van der Marel}, url = {https://doi.org/10.1038/s41598-021-86356-2}, doi = {10.1038/s41598-021-86356-2}, year = {2021}, date = {2021-03-29}, journal = {Scientific Reports}, volume = {11}, number = {1}, publisher = {Springer Science and Business Media LLC}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
H Meley; M Tran; J Teyssier; J A Krieger; T Prokscha; A Suter; Z Salman; M Viret; D van der Marel; S Gariglio Strain tuning of interorbital correlations in LaVO3 thin films Journal Article Physical Review B, 103 (12), 2021. @article{Meley2021, title = {Strain tuning of interorbital correlations in LaVO3 thin films}, author = {H Meley and M Tran and J Teyssier and J A Krieger and T Prokscha and A Suter and Z Salman and M Viret and D van der Marel and S Gariglio}, url = {https://doi.org/10.1103/physrevb.103.125112}, doi = {10.1103/physrevb.103.125112}, year = {2021}, date = {2021-03-05}, journal = {Physical Review B}, volume = {103}, number = {12}, publisher = {American Physical Society (APS)}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
M K Tran; A Akrap; J Levallois; J Teyssier; P Schouwink; C Besnard; P Lerch; J W Allen; M Greenblatt; D van der Marel Pressure-induced structural transitions triggering dimensional crossover in the lithium purple bronze Li0.9Mo6O17 Journal Article Physical Review B, 103 (23), 2021. @article{Tran2021, title = {Pressure-induced structural transitions triggering dimensional crossover in the lithium purple bronze Li0.9Mo6O17}, author = {M K Tran and A Akrap and J Levallois and J Teyssier and P Schouwink and C Besnard and P Lerch and J W Allen and M Greenblatt and D van der Marel}, url = {https://doi.org/10.1103/physrevb.103.235124}, doi = {10.1103/physrevb.103.235124}, year = {2021}, date = {2021-01-14}, journal = {Physical Review B}, volume = {103}, number = {23}, publisher = {American Physical Society (APS)}, abstract = {Open Data on https://yareta.unige.ch/#/home/detail/12b05553-51b5-4833-a590-801bf3352db5}, keywords = {}, pubstate = {published}, tppubtype = {article} } Open Data on https://yareta.unige.ch/#/home/detail/12b05553-51b5-4833-a590-801bf3352db5 |
I Ardizzone; J Teyssier; I Crassee; A B Kuzmenko; D G Mazzone; D J Gawryluk; M Medarde; D van der Marel Raman spectroscopic evidence for multiferroicity in rare earth nickelate single crystals Journal Article Physical Review Research, 3 (3), 2021. @article{Ardizzone2021, title = {Raman spectroscopic evidence for multiferroicity in rare earth nickelate single crystals}, author = {I Ardizzone and J Teyssier and I Crassee and A B Kuzmenko and D G Mazzone and D J Gawryluk and M Medarde and D van der Marel}, url = {https://doi.org/10.1103/physrevresearch.3.033007}, doi = {10.1103/physrevresearch.3.033007}, year = {2021}, date = {2021-01-01}, journal = {Physical Review Research}, volume = {3}, number = {3}, publisher = {American Physical Society (APS)}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
I Ardizzone; M Zingl; J Teyssier; H U R Strand; O Peil; J Fowlie; A B Georgescu; S Catalano; N Bachar; A B Kuzmenko; M Gibert; J -M Triscone; A Georges; D van der Marel Optical properties of LaNiO3 films tuned from compressive to tensile strain Journal Article Phys. Rev. B, 102 , pp. 155148, 2020. @article{Ardizzone2020, title = {Optical properties of LaNiO3 films tuned from compressive to tensile strain}, author = {I Ardizzone and M Zingl and J Teyssier and H U R Strand and O Peil and J Fowlie and A B Georgescu and S Catalano and N Bachar and A B Kuzmenko and M Gibert and J -M Triscone and A Georges and D van der Marel}, url = {https://link.aps.org/doi/10.1103/PhysRevB.102.155148}, doi = {10.1103/PhysRevB.102.155148}, year = {2020}, date = {2020-10-01}, journal = {Phys. Rev. B}, volume = {102}, pages = {155148}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
G. Scheerer; M. Boselli; D. Pulmannova; C. W. Rischau; A. Waelchli; S. Gariglio; E. Giannini; D. van der Marel; J.-M. Triscone Ferroelectricity, Superconductivity, and SrTiO3—Passions of K.A. Müller Journal Article Condensed Matter, 5 (4), pp. 60, 2020, ISSN: 2410-3896. @article{Scheerer2020, title = {Ferroelectricity, Superconductivity, and SrTiO3—Passions of K.A. Müller}, author = {G. Scheerer and M. Boselli and D. Pulmannova and C. W. Rischau and A. Waelchli and S. Gariglio and E. Giannini and D. van der Marel and J.-M. Triscone}, url = {http://dx.doi.org/10.3390/condmat5040060}, doi = {10.3390/condmat5040060}, issn = {2410-3896}, year = {2020}, date = {2020-10-01}, journal = {Condensed Matter}, volume = {5}, number = {4}, pages = {60}, publisher = {MDPI AG}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A Delhomme; D Vaclavkova; A Slobodeniuk; M Orlita; M Potemski; D M Basko; K Watanabe; T Taniguchi; D Mauro; C Barreteau; E Giannini; A F Morpurgo; N Ubrig; C Faugeras Flipping exciton angular momentum with chiral phonons in MoSe2/WSe2 heterobilayers Journal Article 2D Materials, 7 (4), pp. 041002, 2020. @article{Delhomme2020, title = {Flipping exciton angular momentum with chiral phonons in MoSe2/WSe2 heterobilayers}, author = {A Delhomme and D Vaclavkova and A Slobodeniuk and M Orlita and M Potemski and D M Basko and K Watanabe and T Taniguchi and D Mauro and C Barreteau and E Giannini and A F Morpurgo and N Ubrig and C Faugeras}, url = {https://doi.org/10.1088%2F2053-1583%2Faba567}, doi = {10.1088/2053-1583/aba567}, year = {2020}, date = {2020-08-01}, journal = {2D Materials}, volume = {7}, number = {4}, pages = {041002}, publisher = {IOP Publishing}, abstract = {Optical selection rules in monolayers of transition metal dichalcogenides and of their heterostructures are determined by the conservation of the z-component of the total angular momentum— JZ=LZ+SZ – associated with the C3 rotational lattice symmetry which assumes half integer values corresponding, modulo 3, to distinct states. Here we show, based on polarization resolved and low temperature magneto-optical spectroscopy experiments, that the conservation of the total angular momentum in these systems leads to a very efficient exciton-phonon interaction when the coupling is mediated through chiral phonons. We identify these phonons as the Γ point E” modes which despite carrying angular momentum ± 1 are able to induce an excitonic spin-flip of thanks to the C3 symmetry. These experiments reveal the crucial role of electron-phonon interaction in the carrier dynamics of group 6 transition metal dichalcogenides.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Optical selection rules in monolayers of transition metal dichalcogenides and of their heterostructures are determined by the conservation of the z-component of the total angular momentum— JZ=LZ+SZ – associated with the C3 rotational lattice symmetry which assumes half integer values corresponding, modulo 3, to distinct states. Here we show, based on polarization resolved and low temperature magneto-optical spectroscopy experiments, that the conservation of the total angular momentum in these systems leads to a very efficient exciton-phonon interaction when the coupling is mediated through chiral phonons. We identify these phonons as the Γ point E” modes which despite carrying angular momentum ± 1 are able to induce an excitonic spin-flip of thanks to the C3 symmetry. These experiments reveal the crucial role of electron-phonon interaction in the carrier dynamics of group 6 transition metal dichalcogenides. |
K. Wang; B. Xu; C. W. Rischau; N. Bachar ; B. Michon; J. Teyssier ; Y. Qiu; T. Ohtsuki; Bing Cheng; N. P. Armitage; S. Nakatsuji; D. van der Marel Unconventional free charge in the correlated semimetal Nd2Ir2O7 Journal Article Nature Physics, 2020. @article{Wang2020, title = {Unconventional free charge in the correlated semimetal Nd2Ir2O7}, author = {K. Wang and B. Xu and C. W. Rischau and N. Bachar and B. Michon and J. Teyssier and Y. Qiu and T. Ohtsuki and Bing Cheng and N. P. Armitage and S. Nakatsuji and D. van der Marel }, url = {https://www.nature.com/articles/s41567-020-0955-0}, doi = {https://doi.org/10.1038/s41567-020-0955-0}, year = {2020}, date = {2020-06-29}, journal = {Nature Physics}, abstract = {Nd2Ir2O7 is a correlated semimetal with the pyrochlore structure, in which competing spin–orbit coupling and electron–electron interactions are believed to induce a time-reversal symmetry-broken Weyl semimetal phase characterized by pairs of topologically protected Dirac points at the Fermi energy. However, the emergent properties in these materials are far from clear, and exotic new states of matter have been conjectured. Here, we demonstrate optically that, at low temperatures, the free carrier spectral weight is proportional to T2, where T is the temperature, as expected for massless Dirac electrons. However, we do not observe the corresponding T3 term in the specific heat. That the system is not in a Fermi liquid state is further corroborated by the charge carrier scattering rate approaching critical damping and the progressive opening of a correlation-induced gap at low temperatures. These observations cannot be reconciled within the framework of band theory of electron-like quasiparticles and point towards the effective decoupling of the charge transport from the single particle sector.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Nd2Ir2O7 is a correlated semimetal with the pyrochlore structure, in which competing spin–orbit coupling and electron–electron interactions are believed to induce a time-reversal symmetry-broken Weyl semimetal phase characterized by pairs of topologically protected Dirac points at the Fermi energy. However, the emergent properties in these materials are far from clear, and exotic new states of matter have been conjectured. Here, we demonstrate optically that, at low temperatures, the free carrier spectral weight is proportional to T2, where T is the temperature, as expected for massless Dirac electrons. However, we do not observe the corresponding T3 term in the specific heat. That the system is not in a Fermi liquid state is further corroborated by the charge carrier scattering rate approaching critical damping and the progressive opening of a correlation-induced gap at low temperatures. These observations cannot be reconciled within the framework of band theory of electron-like quasiparticles and point towards the effective decoupling of the charge transport from the single particle sector. |
Andrea Amoretti; Martina Meinero; Daniel K Brattan; Federico Caglieris; Enrico Giannini; Marco Affronte; Christian Hess; Bernd Buechner; Nicodemo Magnoli; Marina Putti Hydrodynamical description for magneto-transport in the strange metal phase of Bi-2201 Journal Article Phys. Rev. Research, 2 , pp. 023387, 2020. @article{Amoretti2020, title = {Hydrodynamical description for magneto-transport in the strange metal phase of Bi-2201}, author = {Andrea Amoretti and Martina Meinero and Daniel K Brattan and Federico Caglieris and Enrico Giannini and Marco Affronte and Christian Hess and Bernd Buechner and Nicodemo Magnoli and Marina Putti}, url = {https://link.aps.org/doi/10.1103/PhysRevResearch.2.023387}, doi = {10.1103/PhysRevResearch.2.023387}, year = {2020}, date = {2020-06-01}, journal = {Phys. Rev. Research}, volume = {2}, pages = {023387}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Gen Long; Hugo Henck; Marco Gibertini; Dumitru Dumcenco; Zhe Wang; Takashi Taniguchi; Kenji Watanabe; Enrico Giannini; Alberto F Morpurgo Persistence of Magnetism in Atomically Thin MnPS3 Crystals Journal Article Nano Letters, 20 (4), pp. 2452–2459, 2020, ISBN: 1530-6984. @article{Long2020, title = {Persistence of Magnetism in Atomically Thin MnPS3 Crystals}, author = {Gen Long and Hugo Henck and Marco Gibertini and Dumitru Dumcenco and Zhe Wang and Takashi Taniguchi and Kenji Watanabe and Enrico Giannini and Alberto F Morpurgo}, url = {https://doi.org/10.1021/acs.nanolett.9b05165}, doi = {10.1021/acs.nanolett.9b05165}, isbn = {1530-6984}, year = {2020}, date = {2020-04-08}, booktitle = {Nano Letters}, journal = {Nano Letters}, volume = {20}, number = {4}, pages = {2452--2459}, publisher = {American Chemical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Diego Mauro; Hugo Henck; Marco Gibertini; Michele Filippone; Enrico Giannini; Ignacio Gutierrez; Alberto F Morpurgo Multi-frequency Shubnikov-de Haas oscillations in topological semimetal Pt2HgSe3 Journal Article 2D Materials, 7 (2), pp. 025042, 2020. @article{Mauro2020b, title = {Multi-frequency Shubnikov-de Haas oscillations in topological semimetal Pt2HgSe3}, author = {Diego Mauro and Hugo Henck and Marco Gibertini and Michele Filippone and Enrico Giannini and Ignacio Gutierrez and Alberto F Morpurgo}, url = {https://doi.org/10.1088%2F2053-1583%2Fab7689}, doi = {10.1088/2053-1583/ab7689}, year = {2020}, date = {2020-03-01}, journal = {2D Materials}, volume = {7}, number = {2}, pages = {025042}, publisher = {IOP Publishing}, abstract = {Monolayer jacutingaite (Pt2HgSe3) has been recently identified as a candidate quantum spin Hall system with a 0.5 eV band gap, but no transport measurements have been performed so far on this material, neither in monolayer nor in the bulk. By using a dedicated high-pressure technique, we grow crystals enabling the exfoliation of 50-100 nm thick layers and the realization of devices for controlled transport experiments. Magnetoresistance measurements indicate that jacutingaite is a semimetal, exhibiting Shubnikov-de Haas (SdH) resistance oscillations with a multi-frequency spectrum. We adapt the Lifshitz-Kosevich formula to analyze quantitatively the SdH resistance oscillations in the presence of multiple frequencies, and find that the experimental observations are overall reproduced well by band structure ab-initio calculations for bulk jacutingaite. Together with the relatively high electron mobility extracted from the experiments (≈ 2000 cm2/V−1s−1, comparable to what is observed in WTe2 crystals of the same thickness), our results indicate that monolayer jacutingaite should provide an excellent platform to investigate transport in 2D quantum spin Hall systems.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Monolayer jacutingaite (Pt2HgSe3) has been recently identified as a candidate quantum spin Hall system with a 0.5 eV band gap, but no transport measurements have been performed so far on this material, neither in monolayer nor in the bulk. By using a dedicated high-pressure technique, we grow crystals enabling the exfoliation of 50-100 nm thick layers and the realization of devices for controlled transport experiments. Magnetoresistance measurements indicate that jacutingaite is a semimetal, exhibiting Shubnikov-de Haas (SdH) resistance oscillations with a multi-frequency spectrum. We adapt the Lifshitz-Kosevich formula to analyze quantitatively the SdH resistance oscillations in the presence of multiple frequencies, and find that the experimental observations are overall reproduced well by band structure ab-initio calculations for bulk jacutingaite. Together with the relatively high electron mobility extracted from the experiments (≈ 2000 cm2/V−1s−1, comparable to what is observed in WTe2 crystals of the same thickness), our results indicate that monolayer jacutingaite should provide an excellent platform to investigate transport in 2D quantum spin Hall systems. |
I Cucchi; A Marrazzo; E Cappelli; S Ricc`o; F Y Bruno; S Lisi; M Hoesch; T K Kim; C Cacho; C Besnard; E Giannini; N Marzari; M Gibertini; F Baumberger; A Tamai Bulk and Surface Electronic Structure of the Dual-Topology Semimetal Pt2HgSe3 Journal Article Phys. Rev. Lett., 124 , pp. 106402, 2020. @article{Cucchi2020, title = {Bulk and Surface Electronic Structure of the Dual-Topology Semimetal Pt2HgSe3}, author = {I Cucchi and A Marrazzo and E Cappelli and S Ricc`o and F Y Bruno and S Lisi and M Hoesch and T K Kim and C Cacho and C Besnard and E Giannini and N Marzari and M Gibertini and F Baumberger and A Tamai}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.124.106402}, doi = {10.1103/PhysRevLett.124.106402}, year = {2020}, date = {2020-03-01}, journal = {Phys. Rev. Lett.}, volume = {124}, pages = {106402}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Bojja Aditya Reddy; Evgeniy Ponomarev; Ignacio Gutiérrez-Lezama; Nicolas Ubrig; Céline Barreteau; Enrico Giannini; Alberto F Morpurgo Synthetic Semimetals with van der Waals Interfaces Journal Article Nano Letters, 20 (2), pp. 1322–1328, 2020, ISBN: 1530-6984. @article{Reddy2020, title = {Synthetic Semimetals with van der Waals Interfaces}, author = {Bojja Aditya Reddy and Evgeniy Ponomarev and Ignacio Gutiérrez-Lezama and Nicolas Ubrig and Céline Barreteau and Enrico Giannini and Alberto F Morpurgo}, url = {https://doi.org/10.1021/acs.nanolett.9b04810}, doi = {10.1021/acs.nanolett.9b04810}, isbn = {1530-6984}, year = {2020}, date = {2020-02-12}, booktitle = {Nano Letters}, journal = {Nano Letters}, volume = {20}, number = {2}, pages = {1322--1328}, publisher = {American Chemical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Aleksandra V Zabuga; Marcelle I Arrigo; Jérémie Teyssier; Sébastien R Mouchet; Kanto Nishikawa; Masafumi Matsui; Miguel Vences; Michel C Milinkovitch Translucent in air and iridescent in water: structural analysis of a salamander egg sac Journal Article Soft Matter, pp. -, 2020. @article{C9SM02151E, title = {Translucent in air and iridescent in water: structural analysis of a salamander egg sac}, author = {Aleksandra V Zabuga and Marcelle I Arrigo and Jérémie Teyssier and Sébastien R Mouchet and Kanto Nishikawa and Masafumi Matsui and Miguel Vences and Michel C Milinkovitch}, url = {http://dx.doi.org/10.1039/C9SM02151E}, doi = {10.1039/C9SM02151E}, year = {2020}, date = {2020-01-01}, journal = {Soft Matter}, pages = {-}, publisher = {The Royal Society of Chemistry}, abstract = {Females of some Asian salamanders of the genus Hynobius deposit in streams their eggs embedded in a translucent envelope called an ‘egg sac’. The edges of the envelope exhibit a spectacular blue-to-yellow iridescent glow, which instantaneously disappears when the sac is removed from water. First, our scanning electron microscopy analyses reveal that the inner surface of the 100 μm-thick envelope displays striations (length scale of about 3 μm), which are themselves covered by much smaller (190 ± 30 nm) and quasi-periodic corrugations. The latter could constitute a surface diffraction grating generating iridescence by light interference. Second, our transmission electron microscopy and focused-ion-beam scanning electron microscopy analyses show that the bulk of the egg sac wall is composed of meandering fibres with a quasi-periodic modulation of 190 ± 60 nm along the thickness of the envelope, generating a photonic crystal. Third, Fourier power analyses of 450 electron microscopy images with varying incident angles indicate that changing the surrounding medium from water to air shifts most of the backscattered power spectrum to the ultraviolet range, hence, explaining that the egg sac loses visible iridescence when removed out of the water. Fourth, the results of our photography and optical spectroscopy experiments of submerged and emerged egg sacs rule out the possibility that the iridescence is due to a thin film or a multilayer, whereas the observed non-specular response is compatible with the backscattering expected from surface diffraction gratings and volumetric photonic crystals with spatial 1D modulation. Finally, although we mention several potential biological functions of the egg sac structural colours and iridescence, we emphasise that these optical properties might be the by-products of the envelope material internal structure selected during evolution for its mechanical properties.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Females of some Asian salamanders of the genus Hynobius deposit in streams their eggs embedded in a translucent envelope called an ‘egg sac’. The edges of the envelope exhibit a spectacular blue-to-yellow iridescent glow, which instantaneously disappears when the sac is removed from water. First, our scanning electron microscopy analyses reveal that the inner surface of the 100 μm-thick envelope displays striations (length scale of about 3 μm), which are themselves covered by much smaller (190 ± 30 nm) and quasi-periodic corrugations. The latter could constitute a surface diffraction grating generating iridescence by light interference. Second, our transmission electron microscopy and focused-ion-beam scanning electron microscopy analyses show that the bulk of the egg sac wall is composed of meandering fibres with a quasi-periodic modulation of 190 ± 60 nm along the thickness of the envelope, generating a photonic crystal. Third, Fourier power analyses of 450 electron microscopy images with varying incident angles indicate that changing the surrounding medium from water to air shifts most of the backscattered power spectrum to the ultraviolet range, hence, explaining that the egg sac loses visible iridescence when removed out of the water. Fourth, the results of our photography and optical spectroscopy experiments of submerged and emerged egg sacs rule out the possibility that the iridescence is due to a thin film or a multilayer, whereas the observed non-specular response is compatible with the backscattering expected from surface diffraction gratings and volumetric photonic crystals with spatial 1D modulation. Finally, although we mention several potential biological functions of the egg sac structural colours and iridescence, we emphasise that these optical properties might be the by-products of the envelope material internal structure selected during evolution for its mechanical properties. |
D Matera; M Bonura; R v Cern'y; S McKeown Walker; F Buta; D LeBoeuf; X Chaud; E Giannini; C Senatore High-field superconductivity in C-doped MgB2 bulk samples prepared by a rapid synthesis route Journal Article Scientific Reports, 10 (1), pp. 17656, 2020, ISBN: 2045-2322. @article{cite-key, title = {High-field superconductivity in C-doped MgB2 bulk samples prepared by a rapid synthesis route}, author = {D Matera and M Bonura and R {v C}ern{'y} and S McKeown Walker and F Buta and D LeBoeuf and X Chaud and E Giannini and C Senatore}, url = {https://doi.org/10.1038/s41598-020-74300-9}, doi = {10.1038/s41598-020-74300-9}, isbn = {2045-2322}, year = {2020}, date = {2020-01-01}, journal = {Scientific Reports}, volume = {10}, number = {1}, pages = {17656}, abstract = {The upper critical field sets the thermodynamic limit to superconductivity. A big gap is present between the upper-critical-field values measured in MgB2 polycrystalline bulk superconductors and those of thin films, where values as high as ~ 50 T have been achieved at 4.2 K. Filling this gap would unlock the potential of MgB2 for magnet applications. This work presents the results of an extensive experimental campaign on MgB2 bulk samples, which has been guided by a Design of Experiment. We modeled the dependence of the upper critical field on the main synthesis parameters and established a new record (~ 35 T at 4.2 K) preparing C-doped bulk samples by a non-conventional rapid-synthesis route. This value appears to be an upper boundary for the upper critical field in bulk samples. Structural disorder in films seems to act selectively on one of the two bands where superconductivity in MgB2 takes place: this enhances the upper critical field while reducing the critical temperature only by few Kelvins. On the other hand, the critical temperature in bulk samples decreases monotonically when structural disorder increases, and this imposes a limit to the maximum achievable upper critical field.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The upper critical field sets the thermodynamic limit to superconductivity. A big gap is present between the upper-critical-field values measured in MgB2 polycrystalline bulk superconductors and those of thin films, where values as high as ~ 50 T have been achieved at 4.2 K. Filling this gap would unlock the potential of MgB2 for magnet applications. This work presents the results of an extensive experimental campaign on MgB2 bulk samples, which has been guided by a Design of Experiment. We modeled the dependence of the upper critical field on the main synthesis parameters and established a new record (~ 35 T at 4.2 K) preparing C-doped bulk samples by a non-conventional rapid-synthesis route. This value appears to be an upper boundary for the upper critical field in bulk samples. Structural disorder in films seems to act selectively on one of the two bands where superconductivity in MgB2 takes place: this enhances the upper critical field while reducing the critical temperature only by few Kelvins. On the other hand, the critical temperature in bulk samples decreases monotonically when structural disorder increases, and this imposes a limit to the maximum achievable upper critical field. |
Dumitru Dumcenco; Enrico Giannini Growth of van der Waals magnetic semiconductor materials Journal Article Journal of Crystal Growth, 548 , pp. 125799, 2020, ISSN: 0022-0248. @article{Dumcenco2020, title = {Growth of van der Waals magnetic semiconductor materials}, author = {Dumitru Dumcenco and Enrico Giannini}, url = {http://www.sciencedirect.com/science/article/pii/S0022024820303225}, doi = {https://doi.org/10.1016/j.jcrysgro.2020.125799}, issn = {0022-0248}, year = {2020}, date = {2020-01-01}, journal = {Journal of Crystal Growth}, volume = {548}, pages = {125799}, abstract = {Magnetic order in two-dimensional semiconducting layered materials is extremely rare. This has recently triggered a great interest in a variety of layered magnetic compounds, determining whether their magnetic properties can be retained down to monolayer thickness. The most promising systems are the binary MX3 and ternary MYZ3 compounds, where M is a metal, X is a halogen element, Y = Si, Ge or P, and Z is a chalcogen. The transition metal incorporates the magnetism, by a partially filled d-shell, thus enabling ferroic responses for enhanced functionalities. In most of these systems, the phase diagrams are not known and the crystal growth process is made challenging by the high fugacity of some elements and the high reaction temperature needed. We review the recent progress in crystal growth of various compounds of these families, namely CrI3, CrCl3, CrSiTe3, CrGeTe3, MnPS3 and MnPSe3, for which we used different growth techniques, such as melt growth, physical vapor transport and chemical vapor transport. The growth parameters are summarized and discussed. The characterization of the materials is focusing on the determination of the crystal structure, chemical composition and magnetic properties. In some cases, exfoliated flakes of these crystals have been successfully used for nano-device fabrication.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Magnetic order in two-dimensional semiconducting layered materials is extremely rare. This has recently triggered a great interest in a variety of layered magnetic compounds, determining whether their magnetic properties can be retained down to monolayer thickness. The most promising systems are the binary MX3 and ternary MYZ3 compounds, where M is a metal, X is a halogen element, Y = Si, Ge or P, and Z is a chalcogen. The transition metal incorporates the magnetism, by a partially filled d-shell, thus enabling ferroic responses for enhanced functionalities. In most of these systems, the phase diagrams are not known and the crystal growth process is made challenging by the high fugacity of some elements and the high reaction temperature needed. We review the recent progress in crystal growth of various compounds of these families, namely CrI3, CrCl3, CrSiTe3, CrGeTe3, MnPS3 and MnPSe3, for which we used different growth techniques, such as melt growth, physical vapor transport and chemical vapor transport. The growth parameters are summarized and discussed. The characterization of the materials is focusing on the determination of the crystal structure, chemical composition and magnetic properties. In some cases, exfoliated flakes of these crystals have been successfully used for nano-device fabrication. |
Á. Pásztor; A. Scarfato; C. Barreteau; E. Giannini; C. Renner Dimensional cross-over of the charge density wave order parameter in thin exfoliated 1T-VSe2 Journal Article 2D Materials, 4 (4), pp. 041005, 2019. @article{Pásztor2019, title = {Dimensional cross-over of the charge density wave order parameter in thin exfoliated 1T-VSe2}, author = {Á. Pásztor and A. Scarfato and C. Barreteau and E. Giannini and C. Renner}, url = {https://doi.org/10.1088%2F2053-1583%2Faa86de}, doi = {10.1088/2053-1583/aa86de}, year = {2019}, date = {2019-09-04}, journal = {2D Materials}, volume = {4}, number = {4}, pages = {041005}, abstract = {Isolating single unit-cell thin layers from the bulk matrix of layered compounds offers tremendous opportunities to design novel functional electronic materials. However, a comprehensive thickness dependence study is paramount to harness the electronic properties of such atomic foils and their stacking into synthetic heterostructures. Here we show that a dimensional crossover and quantum confinement with reducing thickness result in a striking non-monotonic evolution of the charge density wave transition temperature in VSe2. Our conclusion is drawn from a direct derivation of the local order parameter and transition temperature from the real space charge modulation amplitude imaged by scanning tunnelling microscopy. This study lifts the disagreement of previous independent transport measurements. We find that thickness can be a non-trivial tuning parameter and demonstrate the importance of considering a finite thickness range to accurately characterize its influence.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Isolating single unit-cell thin layers from the bulk matrix of layered compounds offers tremendous opportunities to design novel functional electronic materials. However, a comprehensive thickness dependence study is paramount to harness the electronic properties of such atomic foils and their stacking into synthetic heterostructures. Here we show that a dimensional crossover and quantum confinement with reducing thickness result in a striking non-monotonic evolution of the charge density wave transition temperature in VSe2. Our conclusion is drawn from a direct derivation of the local order parameter and transition temperature from the real space charge modulation amplitude imaged by scanning tunnelling microscopy. This study lifts the disagreement of previous independent transport measurements. We find that thickness can be a non-trivial tuning parameter and demonstrate the importance of considering a finite thickness range to accurately characterize its influence. |
T. Jaouen; B. Hildebrand; M. L. Mottas; I. M. Di Giovannantonio; P. Ruffieux; M. Rumo; C. W. Nicholson; E. Razzoli; C. Barreteau; A. Ubaldini; E. Giannini; F. Vanini; H. Beck; C. Monney; P. Aebi Phase separation in the vicinity of Fermi surface hot spots Journal Article Physical Review B, 100 (7), pp. 075152, 2019. @article{Jaouen2019, title = {Phase separation in the vicinity of Fermi surface hot spots}, author = {T. Jaouen and B. Hildebrand and M. L. Mottas and I. M. Di Giovannantonio and P. Ruffieux and M. Rumo and C. W. Nicholson and E. Razzoli and C. Barreteau and A. Ubaldini and E. Giannini and F. Vanini and H. Beck and C. Monney and P. Aebi}, url = {https://link.aps.org/doi/10.1103/PhysRevB.100.075152}, doi = {10.1103/PhysRevB.100.075152}, year = {2019}, date = {2019-08-11}, journal = {Physical Review B}, volume = {100}, number = {7}, pages = {075152}, abstract = {Spatially inhomogeneous electronic states are expected to be key ingredients for the emergence of superconducting phases in quantum materials hosting charge-density waves (CDWs). Prototypical materials are transition-metal dichalcogenides (TMDCs) and among them, 1T−TiSe2 exhibiting intertwined CDW and superconducting states under Cu intercalation, pressure, or electrical gating. Although it has been recently proposed that the emergence of superconductivity relates to CDW fluctuations and the development of spatial inhomogeneities in the CDW order, the fundamental mechanism underlying such a phase separation (PS) is still missing. Using angle-resolved photoemission spectroscopy and variable-temperature scanning tunneling microscopy, we report on the phase diagram of the CDW in 1T−TiSe2 as a function of Ti self-doping, an overlooked degree of freedom inducing CDW texturing. We find an intrinsic tendency towards electronic PS in the vicinity of Fermi surface (FS) “hot spots,” i.e., locations with band crossings close to, but not at the Fermi level. We therefore demonstrate an intimate relationship between the FS topology and the emergence of spatially textured electronic phases which is expected to be generalizable to many doped CDW compounds.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Spatially inhomogeneous electronic states are expected to be key ingredients for the emergence of superconducting phases in quantum materials hosting charge-density waves (CDWs). Prototypical materials are transition-metal dichalcogenides (TMDCs) and among them, 1T−TiSe2 exhibiting intertwined CDW and superconducting states under Cu intercalation, pressure, or electrical gating. Although it has been recently proposed that the emergence of superconductivity relates to CDW fluctuations and the development of spatial inhomogeneities in the CDW order, the fundamental mechanism underlying such a phase separation (PS) is still missing. Using angle-resolved photoemission spectroscopy and variable-temperature scanning tunneling microscopy, we report on the phase diagram of the CDW in 1T−TiSe2 as a function of Ti self-doping, an overlooked degree of freedom inducing CDW texturing. We find an intrinsic tendency towards electronic PS in the vicinity of Fermi surface (FS) “hot spots,” i.e., locations with band crossings close to, but not at the Fermi level. We therefore demonstrate an intimate relationship between the FS topology and the emergence of spatially textured electronic phases which is expected to be generalizable to many doped CDW compounds. |
D. van der Marel; F. Barantani; C. W. Rischau Possible mechanism for superconductivity in doped SrTiO3 Journal Article Physical Review Research, 1 (1), pp. 013003, 2019. @article{vanderMarel2019b, title = {Possible mechanism for superconductivity in doped SrTiO3}, author = {D. van der Marel and F. Barantani and C. W. Rischau}, url = {https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.1.013003}, doi = {https://doi.org/10.1103/PhysRevResearch.1.013003}, year = {2019}, date = {2019-08-09}, journal = {Physical Review Research}, volume = {1}, number = {1}, pages = {013003}, abstract = {The soft ferroelectric phonon in SrTiO3 observed with optical spectroscopy has an extraordinarily strong spectral weight which is much stronger than expected in the limit of a perfectly ionic compound. This “charged phonon” effect in SrTiO3 is caused by the close-to-covalent character of the Ti-O ionic bond and implies a strong coupling between the soft ferroelectric phonon and the interband transitions across the 3-eV gap of SrTiO3. We demonstrate that this coupling leads, in addition to the charged phonon effect, to a pairing interaction involving the exchange of two transverse optical phonons. This process owes its relevance to the strong electron-phonon coupling and to the fact that the interaction mediated by a single transverse optical phonon vanishes at low electron density. We use the experimental soft phonon spectral weight to calculate the strength of the biphonon mediated pairing interaction in the electron-doped material and show that it is of the correct magnitude when compared to the experimental value of the superconducting critical temperature. Biphonon exchange is therefore an important pairing mechanism at low doping, and may be the key to understanding the occurrence of superconductivity in doped SrTiO3 and other low electron density materials.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The soft ferroelectric phonon in SrTiO3 observed with optical spectroscopy has an extraordinarily strong spectral weight which is much stronger than expected in the limit of a perfectly ionic compound. This “charged phonon” effect in SrTiO3 is caused by the close-to-covalent character of the Ti-O ionic bond and implies a strong coupling between the soft ferroelectric phonon and the interband transitions across the 3-eV gap of SrTiO3. We demonstrate that this coupling leads, in addition to the charged phonon effect, to a pairing interaction involving the exchange of two transverse optical phonons. This process owes its relevance to the strong electron-phonon coupling and to the fact that the interaction mediated by a single transverse optical phonon vanishes at low electron density. We use the experimental soft phonon spectral weight to calculate the strength of the biphonon mediated pairing interaction in the electron-doped material and show that it is of the correct magnitude when compared to the experimental value of the superconducting critical temperature. Biphonon exchange is therefore an important pairing mechanism at low doping, and may be the key to understanding the occurrence of superconductivity in doped SrTiO3 and other low electron density materials. |
Ievgeniia O Nedoliuk; Sheng Hu; Andre K Geim; Alexey B Kuzmenko Colossal infrared and terahertz magneto-optical activity in a two-dimensional Dirac material Journal Article NATURE NANOTECHNOLOGY, 14 (8), pp. 756-761, 2019, ISSN: 1748-3387. @article{ISI:000478794700014, title = {Colossal infrared and terahertz magneto-optical activity in a two-dimensional Dirac material}, author = {Ievgeniia O Nedoliuk and Sheng Hu and Andre K Geim and Alexey B Kuzmenko}, doi = {10.1038/s41565-019-0489-8}, issn = {1748-3387}, year = {2019}, date = {2019-08-01}, journal = {NATURE NANOTECHNOLOGY}, volume = {14}, number = {8}, pages = {756-761}, publisher = {NATURE PUBLISHING GROUP}, address = {MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND}, abstract = {When two-dimensional electron gases (2DEGs) are exposed to a magnetic field, they resonantly absorb electromagnetic radiation via electronic transitions between Landau levels(1). In 2DEGs with a Dirac spectrum, such as graphene, theory predicts an exceptionally high infrared magneto-absorption, even at zero doping(2-5). However, the measured Landau-level magneto-optical effects in graphene have been much weaker than expected(2,6-12) because of imperfections in the samples available for such experiments. Here, we measure magneto-transmission and Faraday rotation in high-mobility encapsulated monolayer graphene using a custom-designed set-up for magneto-infrared microspectroscopy. Our results show strongly enhanced magneto-optical activity in the infrared and terahertz ranges, characterized by absorption of light near to the 50% maximum allowed, 100% magnetic circular dichroism and high Faraday rotation. Considering that sizeable effects have been already observed at routinely achievable magnetic fields, our findings demonstrate the potential of magnetic tuning in 2D Dirac materials for long-wavelength optoelectronics and plasmonics.}, keywords = {}, pubstate = {published}, tppubtype = {article} } When two-dimensional electron gases (2DEGs) are exposed to a magnetic field, they resonantly absorb electromagnetic radiation via electronic transitions between Landau levels(1). In 2DEGs with a Dirac spectrum, such as graphene, theory predicts an exceptionally high infrared magneto-absorption, even at zero doping(2-5). However, the measured Landau-level magneto-optical effects in graphene have been much weaker than expected(2,6-12) because of imperfections in the samples available for such experiments. Here, we measure magneto-transmission and Faraday rotation in high-mobility encapsulated monolayer graphene using a custom-designed set-up for magneto-infrared microspectroscopy. Our results show strongly enhanced magneto-optical activity in the infrared and terahertz ranges, characterized by absorption of light near to the 50% maximum allowed, 100% magnetic circular dichroism and high Faraday rotation. Considering that sizeable effects have been already observed at routinely achievable magnetic fields, our findings demonstrate the potential of magnetic tuning in 2D Dirac materials for long-wavelength optoelectronics and plasmonics. |
W Luo; M. Boselli; J M Poumirol; I Ardizzone; J Teyssier; D van der Marel; S Gariglio; J M Triscone; A B Kuzmenko High sensitivity variable-temperature infrared nanoscopy of conducting oxide interfaces Journal Article Nature Communications, 10 (1), pp. 2774, 2019. @article{Luo2019, title = {High sensitivity variable-temperature infrared nanoscopy of conducting oxide interfaces}, author = {W Luo and M. Boselli and J M Poumirol and I Ardizzone and J Teyssier and D van der Marel and S Gariglio and J M Triscone and A B Kuzmenko}, url = {https://doi.org/10.1038/s41467-019-10672-5}, doi = {10.1038/s41467-019-10672-5}, year = {2019}, date = {2019-06-24}, journal = {Nature Communications}, volume = {10}, number = {1}, pages = {2774}, abstract = {Probing the local transport properties of two-dimensional electron systems (2DES) confined at buried interfaces requires a non-invasive technique with a high spatial resolution operating in a broad temperature range. In this paper, we investigate the scattering-type scanning near field optical microscopy as a tool for studying the conducting LaAlO3/SrTiO3 interface from room temperature down to 6 K. We show that the near-field optical signal, in particular its phase component, is highly sensitive to the transport properties of the electron system present at the interface. Our modeling reveals that such sensitivity originates from the interaction of the AFM tip with coupled plasmon–phonon modes with a small penetration depth. The model allows us to quantitatively correlate changes in the optical signal with the variation of the 2DES transport properties induced by cooling and by electrostatic gating. To probe the spatial resolution of the technique, we image conducting nano-channels written in insulating heterostructures with a voltage-biased tip of an atomic force microscope.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Probing the local transport properties of two-dimensional electron systems (2DES) confined at buried interfaces requires a non-invasive technique with a high spatial resolution operating in a broad temperature range. In this paper, we investigate the scattering-type scanning near field optical microscopy as a tool for studying the conducting LaAlO3/SrTiO3 interface from room temperature down to 6 K. We show that the near-field optical signal, in particular its phase component, is highly sensitive to the transport properties of the electron system present at the interface. Our modeling reveals that such sensitivity originates from the interaction of the AFM tip with coupled plasmon–phonon modes with a small penetration depth. The model allows us to quantitatively correlate changes in the optical signal with the variation of the 2DES transport properties induced by cooling and by electrostatic gating. To probe the spatial resolution of the technique, we image conducting nano-channels written in insulating heterostructures with a voltage-biased tip of an atomic force microscope. |
L. Thiel; Z. Wang; M. A. Tschudin; D. Rohner; I. Gutierrez-Lezama; N. Ubrig; M. Gibertini; E. Giannini; A. F. Morpurgo; P. Maletinsky Probing magnetism in 2D materials at the nanoscale with single-spin microscopy Journal Article Science, 364 (6444), pp. 973-976, 2019. @article{Thiel2019, title = {Probing magnetism in 2D materials at the nanoscale with single-spin microscopy}, author = {L. Thiel and Z. Wang and M. A. Tschudin and D. Rohner and I. Gutierrez-Lezama and N. Ubrig and M. Gibertini and E. Giannini and A. F. Morpurgo and P. Maletinsky}, url = {https://science.sciencemag.org/content/364/6444/973}, doi = {10.1126/science.aav6926}, year = {2019}, date = {2019-06-07}, journal = {Science}, volume = {364}, number = {6444}, pages = {973-976}, abstract = {The discovery of ferromagnetism in two-dimensional (2D) van der Waals (vdW) crystals has generated widespread interest. Making further progress in this area requires quantitative knowledge of the magnetic properties of vdW magnets at the nanoscale. We used scanning single-spin magnetometry based on diamond nitrogen-vacancy centers to image the magnetization, localized defects, and magnetic domains of atomically thin crystals of the vdW magnet chromium(III) iodide (CrI3). We determined the magnetization of CrI3 monolayers to be ≈16 Bohr magnetons per square nanometer, with comparable values in samples with odd numbers of layers; however, the magnetization vanishes when the number of layers is even. We also found that structural modifications can induce switching between ferromagnetic and antiferromagnetic interlayer ordering. These results demonstrate the benefit of using single-spin scanning magnetometry to study the magnetism of 2D vdW magnets.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The discovery of ferromagnetism in two-dimensional (2D) van der Waals (vdW) crystals has generated widespread interest. Making further progress in this area requires quantitative knowledge of the magnetic properties of vdW magnets at the nanoscale. We used scanning single-spin magnetometry based on diamond nitrogen-vacancy centers to image the magnetization, localized defects, and magnetic domains of atomically thin crystals of the vdW magnet chromium(III) iodide (CrI3). We determined the magnetization of CrI3 monolayers to be ≈16 Bohr magnetons per square nanometer, with comparable values in samples with odd numbers of layers; however, the magnetization vanishes when the number of layers is even. We also found that structural modifications can induce switching between ferromagnetic and antiferromagnetic interlayer ordering. These results demonstrate the benefit of using single-spin scanning magnetometry to study the magnetism of 2D vdW magnets. |
M. Spera; A. Scarfato; E. Giannini; C. Renner Energy-dependent spatial texturing of charge order in 1T-CuxTiSe2 Journal Article Physical Review B, 99 (15), pp. 155133, 2019. @article{Spera2019, title = {Energy-dependent spatial texturing of charge order in 1T-CuxTiSe2}, author = {M. Spera and A. Scarfato and E. Giannini and C. Renner}, year = {2019}, date = {2019-04-18}, journal = {Physical Review B}, volume = {99}, number = {15}, pages = {155133}, abstract = {We report a detailed study of the microscopic effects of Cu intercalation on the charge density wave (CDW) in 1T−CuxTiSe2. Scanning tunneling microscopy and spectroscopy reveal a unique, Cu-driven spatial texturing of the charge-ordered phase, with the appearance of energy-dependent CDW patches and sharp π-phase shift domain walls (πDWs). The energy and doping dependencies of the patchwork are directly linked to the inhomogeneous potential landscape due to the Cu intercalants. They imply a CDW gap with unusual features, including a large amplitude, the opening below the Fermi level, and a shift to higher binding energy with electron doping. Unlike the patchwork, the πDWs occur independently of the intercalated Cu distribution. They remain atomically sharp throughout the investigated phase diagram and occur in both superconducting and nonsuperconducting specimens. These results provide unique atomic-scale insight into the CDW ground state, questioning the existence of incommensurate CDW domain walls and contributing to understanding its formation mechanism and interplay with superconductivity.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We report a detailed study of the microscopic effects of Cu intercalation on the charge density wave (CDW) in 1T−CuxTiSe2. Scanning tunneling microscopy and spectroscopy reveal a unique, Cu-driven spatial texturing of the charge-ordered phase, with the appearance of energy-dependent CDW patches and sharp π-phase shift domain walls (πDWs). The energy and doping dependencies of the patchwork are directly linked to the inhomogeneous potential landscape due to the Cu intercalants. They imply a CDW gap with unusual features, including a large amplitude, the opening below the Fermi level, and a shift to higher binding energy with electron doping. Unlike the patchwork, the πDWs occur independently of the intercalated Cu distribution. They remain atomically sharp throughout the investigated phase diagram and occur in both superconducting and nonsuperconducting specimens. These results provide unique atomic-scale insight into the CDW ground state, questioning the existence of incommensurate CDW domain walls and contributing to understanding its formation mechanism and interplay with superconductivity. |
M.-L. Mottas; T. Jaouen; B. Hildebrand; M. Rumo; F. Vanini; E. Razzoli; E. Giannini; C. Barreteau; D. R. Bowler; C. Monney; H. Beck; and P. Aebi Semimetal-to-semiconductor transition and charge-density-wave suppression in 1T−TiSe2−xSx single crystals Journal Article Physical Review B, 99 (15), pp. 155103, 2019. @article{Mottas2019, title = {Semimetal-to-semiconductor transition and charge-density-wave suppression in 1T−TiSe2−xSx single crystals}, author = {M.-L. Mottas and T. Jaouen and B. Hildebrand and M. Rumo and F. Vanini and E. Razzoli and E. Giannini and C. Barreteau and D. R. Bowler and C. Monney and H. Beck and and P. Aebi}, url = {https://link.aps.org/doi/10.1103/PhysRevB.99.155103}, doi = {10.1103/PhysRevB.99.155103}, year = {2019}, date = {2019-04-01}, journal = {Physical Review B}, volume = {99}, number = {15}, pages = {155103}, abstract = {The transition-metal dichalcogenide 1T−TiSe2 is a quasi-two-dimensional layered material with a phase transition towards a commensurate charge-density wave (CDW) at a critical temperature Tc≈200K. The relationship between the origin of the CDW instability and the semimetallic or semiconducting character of the normal state, i.e., with the nonreconstructed Fermi-surface topology, remains elusive. By combining angle-resolved photoemission spectroscopy (ARPES), scanning tunneling microscopy (STM), and density functional theory (DFT) calculations, we investigate 1T−TiSe2−xSx single crystals. Using STM, we first show that the long-range phase-coherent CDW state is stable against S substitutions with concentrations, at least, up to x=0.34. The ARPES measurements then reveal a slow but continuous decrease in the overlap between the electron and the hole (e−h) bands of the semimetallic normal state well reproduced by DFT and related to slight reductions of both the CDW order parameter and Tc. Our DFT calculations further predict a semimetal-to-semiconductor transition of the normal state at a higher critical S concentration of xc=0.9±0.1 that coincides with a suppressed CDW state in TiSeS as measured with STM. Finally, we rationalize the x dependence of the e−h band overlap in terms of isovalent substitution-induced competing chemical pressure and charge localization effects. Our study highlights the key role of the e−h band overlap for the CDW instability.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The transition-metal dichalcogenide 1T−TiSe2 is a quasi-two-dimensional layered material with a phase transition towards a commensurate charge-density wave (CDW) at a critical temperature Tc≈200K. The relationship between the origin of the CDW instability and the semimetallic or semiconducting character of the normal state, i.e., with the nonreconstructed Fermi-surface topology, remains elusive. By combining angle-resolved photoemission spectroscopy (ARPES), scanning tunneling microscopy (STM), and density functional theory (DFT) calculations, we investigate 1T−TiSe2−xSx single crystals. Using STM, we first show that the long-range phase-coherent CDW state is stable against S substitutions with concentrations, at least, up to x=0.34. The ARPES measurements then reveal a slow but continuous decrease in the overlap between the electron and the hole (e−h) bands of the semimetallic normal state well reproduced by DFT and related to slight reductions of both the CDW order parameter and Tc. Our DFT calculations further predict a semimetal-to-semiconductor transition of the normal state at a higher critical S concentration of xc=0.9±0.1 that coincides with a suppressed CDW state in TiSeS as measured with STM. Finally, we rationalize the x dependence of the e−h band overlap in terms of isovalent substitution-induced competing chemical pressure and charge localization effects. Our study highlights the key role of the e−h band overlap for the CDW instability. |
O. Shcherban; L. Akselrud; E. Giannini; R. Gladyshevskii Refinement of the Modulated Structures of Pb-Free and Pb-Doped Bi-2223 HTSC Journal Article Acta Physica Polonica A, 133 (4), pp. 1027-1029, 2019. @article{Shcherban2019, title = {Refinement of the Modulated Structures of Pb-Free and Pb-Doped Bi-2223 HTSC}, author = {O. Shcherban and L. Akselrud and E. Giannini and R. Gladyshevskii}, url = {http://psjd.icm.edu.pl/psjd/element/bwmeta1.element.bwnjournal-article-appv133n4p62kz}, year = {2019}, date = {2019-04-01}, journal = {Acta Physica Polonica A}, volume = {133}, number = {4}, pages = {1027-1029}, abstract = {The incommensurate modulated structures of Pb-free and Pb-doped Bi-2223 phases were refined on single-crystal X-ray diffraction data. }, keywords = {}, pubstate = {published}, tppubtype = {article} } The incommensurate modulated structures of Pb-free and Pb-doped Bi-2223 phases were refined on single-crystal X-ray diffraction data. |
Dirk van der Marel Time to respond (Commentary) Online Journal Club for Condensed Matter Physics 2019. @online{vanderMarel2019, title = {Time to respond (Commentary)}, author = {Dirk van der Marel}, url = {https://www.condmatjclub.org/uploads/2019/01/JCCM_January_2019_01.pdf}, year = {2019}, date = {2019-01-01}, organization = {Journal Club for Condensed Matter Physics}, abstract = {Dirk van der Marel writes on some fascinating new technical developments on wideband spectroscopy far far below the diffraction limit and developments following from it including transient spectroscopy.}, keywords = {}, pubstate = {published}, tppubtype = {online} } Dirk van der Marel writes on some fascinating new technical developments on wideband spectroscopy far far below the diffraction limit and developments following from it including transient spectroscopy. |
I. Cucchi; I. Gutierrez-Lezama; E. Cappelli; S. M. Walker; F. Y. Bruno; G. Tenasini; L. Wang; N. Ubrig; C. Barreteau; E. Giannini; M. Gibertini; A. Tamai; A. F. Morpurgo; F. Baumberger Microfocus Laser–Angle-Resolved Photoemission on Encapsulated Mono-, Bi-, and Few-Layer 1T′-WTe2 Journal Article Nano Letters, 19 (1), pp. 554-560, 2018. @article{Cucchi2018, title = {Microfocus Laser–Angle-Resolved Photoemission on Encapsulated Mono-, Bi-, and Few-Layer 1T′-WTe2}, author = {I. Cucchi and I. Gutierrez-Lezama and E. Cappelli and S. M. Walker and F. Y. Bruno and G. Tenasini and L. Wang and N. Ubrig and C. Barreteau and E. Giannini and M. Gibertini and A. Tamai and A. F. Morpurgo and F. Baumberger}, doi = {https://doi.org/10.1021/acs.nanolett.8b04534}, year = {2018}, date = {2018-12-20}, journal = {Nano Letters}, volume = {19}, number = {1}, pages = {554-560}, abstract = {Two-dimensional crystals of semi-metallic van der Waals materials hold much potential for the realization of novel phases, as exemplified by the recent discoveries of a polar metal in few-layer 1T′-WTe2 and of a quantum spin Hall state in monolayers of the same material. Understanding these phases is particularly challenging because little is known from experiments about the momentum space electronic structure of ultrathin crystals. Here, we report direct electronic structure measurements of exfoliated mono-, bi-, and few-layer 1T′-WTe2 by laser-based microfocus angle-resolved photoemission. This is achieved by encapsulating with monolayer graphene a flake of WTe2 comprising regions of different thickness. Our data support the recent identification of a quantum spin Hall state in monolayer 1T′-WTe2 and reveal strong signatures of the broken inversion symmetry in the bilayer. We finally discuss the sensitivity of encapsulated samples to contaminants following exposure to ambient atmosphere.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Two-dimensional crystals of semi-metallic van der Waals materials hold much potential for the realization of novel phases, as exemplified by the recent discoveries of a polar metal in few-layer 1T′-WTe2 and of a quantum spin Hall state in monolayers of the same material. Understanding these phases is particularly challenging because little is known from experiments about the momentum space electronic structure of ultrathin crystals. Here, we report direct electronic structure measurements of exfoliated mono-, bi-, and few-layer 1T′-WTe2 by laser-based microfocus angle-resolved photoemission. This is achieved by encapsulating with monolayer graphene a flake of WTe2 comprising regions of different thickness. Our data support the recent identification of a quantum spin Hall state in monolayer 1T′-WTe2 and reveal strong signatures of the broken inversion symmetry in the bilayer. We finally discuss the sensitivity of encapsulated samples to contaminants following exposure to ambient atmosphere. |
S Borroni; J Teyssier; P Piekarz; A B Kuzmenko; A M Oleifmmode acuteselse śfi; J Lorenzana; F Carbone Light scattering from the critical modes of the Verwey transition in magnetite Journal Article Phys. Rev. B, 98 , pp. 184301, 2018. @article{PhysRevB.98.184301, title = {Light scattering from the critical modes of the Verwey transition in magnetite}, author = {S Borroni and J Teyssier and P Piekarz and A B Kuzmenko and A M Oleifmmode acute{s}else śfi{} and J Lorenzana and F Carbone}, url = {https://link.aps.org/doi/10.1103/PhysRevB.98.184301}, doi = {10.1103/PhysRevB.98.184301}, year = {2018}, date = {2018-11-01}, journal = {Phys. Rev. B}, volume = {98}, pages = {184301}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Alsu Gazizulina; Diana Lucia Quintero-Castro; Dirk Wulferding; Jeremie Teyssier; Karel Prokes; Fabiano Yokaichiya; Andreas Schilling Tuning the orbital-lattice fluctuations in the mixed spin-dimer system Ba3-xSrxCr2O8 Journal Article Phys. Rev. B, 98 , pp. 144115, 2018. @article{PhysRevB.98.144115, title = {Tuning the orbital-lattice fluctuations in the mixed spin-dimer system Ba3-xSrxCr2O8}, author = {Alsu Gazizulina and Diana Lucia Quintero-Castro and Dirk Wulferding and Jeremie Teyssier and Karel Prokes and Fabiano Yokaichiya and Andreas Schilling}, url = {https://link.aps.org/doi/10.1103/PhysRevB.98.144115}, doi = {10.1103/PhysRevB.98.144115}, year = {2018}, date = {2018-10-01}, journal = {Phys. Rev. B}, volume = {98}, pages = {144115}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
K Wang; N Bachar; J Teyssier; W Luo; C W Rischau; G Scheerer; A de la Torre; R S Perry; F Baumberger; D van der Marel Mott transition and collective charge pinning in electron doped Sr2IrO4 Journal Article Phys. Rev. B, 98 , pp. 045107, 2018. @article{PhysRevB.98.045107, title = {Mott transition and collective charge pinning in electron doped Sr2IrO4}, author = {K Wang and N Bachar and J Teyssier and W Luo and C W Rischau and G Scheerer and A de la Torre and R S Perry and F Baumberger and D van der Marel}, url = {https://link.aps.org/doi/10.1103/PhysRevB.98.045107}, doi = {10.1103/PhysRevB.98.045107}, year = {2018}, date = {2018-07-01}, journal = {Phys. Rev. B}, volume = {98}, pages = {045107}, publisher = {American Physical Society}, abstract = {We studied the in-plane dynamic and static charge conductivity of electron doped Sr2IrO4 using optical spectroscopy and DC transport measurements. The optical conductivity indicates that the pristine material is an indirect semiconductor with a direct Mott gap of 0.55 eV. Upon substitution of 2% La per formula unit the Mott gap is suppressed except in a small fraction of the material (15%) where the gap survives, and overall the material remains insulating. Instead of a zero energy mode (or Drude peak) we observe a soft collective mode (SCM) with a broad maximum at 40meV. Doping to 10% increases the strength of the SCM, and a zero-energy mode occurs together with metallic DC conductivity. Further increase of the La substitution doesn't change the spectral weight integral up to 3 eV. It does however result in a transfer of the SCM spectral weight to the zero-energy mode, with a corresponding reduction of the DC resistivity for all temperatures from 4 to 300 K. The presence of a zero-energy mode signals that at least part of the Fermi surface remains ungapped at low temperatures, whereas the SCM appears to be caused by pinning a collective frozen state involving part of the doped electrons.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We studied the in-plane dynamic and static charge conductivity of electron doped Sr2IrO4 using optical spectroscopy and DC transport measurements. The optical conductivity indicates that the pristine material is an indirect semiconductor with a direct Mott gap of 0.55 eV. Upon substitution of 2% La per formula unit the Mott gap is suppressed except in a small fraction of the material (15%) where the gap survives, and overall the material remains insulating. Instead of a zero energy mode (or Drude peak) we observe a soft collective mode (SCM) with a broad maximum at 40meV. Doping to 10% increases the strength of the SCM, and a zero-energy mode occurs together with metallic DC conductivity. Further increase of the La substitution doesn't change the spectral weight integral up to 3 eV. It does however result in a transfer of the SCM spectral weight to the zero-energy mode, with a corresponding reduction of the DC resistivity for all temperatures from 4 to 300 K. The presence of a zero-energy mode signals that at least part of the Fermi surface remains ungapped at low temperatures, whereas the SCM appears to be caused by pinning a collective frozen state involving part of the doped electrons. |
Z. Wang; I. Gutiérrez-Lezama; N. Ubrig; M. Kroner; M. Gibertini; T. Taniguchi; K. Watanabe; A. Imamoğlu; E. Giannini; A. F. Morpurgo Very large tunneling magnetoresistance in layered magnetic semiconductor CrI3 Journal Article Nature Communications, 9 (1), pp. 2516, 2018. @article{Wang2018, title = {Very large tunneling magnetoresistance in layered magnetic semiconductor CrI3}, author = {Z. Wang and I. Gutiérrez-Lezama and N. Ubrig and M. Kroner and M. Gibertini and T. Taniguchi and K. Watanabe and A. Imamoğlu and E. Giannini and A. F. Morpurgo}, doi = {10.1038/s41467-018-04953-8}, year = {2018}, date = {2018-06-28}, journal = {Nature Communications}, volume = {9}, number = {1}, pages = {2516}, abstract = {Magnetic layered van der Waals crystals are an emerging class of materials giving access to new physical phenomena, as illustrated by the recent observation of 2D ferromagnetism in Cr2Ge2Te6 and CrI3. Of particular interest in semiconductors is the interplay between magnetism and transport, which has remained unexplored. Here we report magneto-transport measurements on exfoliated CrI3 crystals. We find that tunneling conduction in the direction perpendicular to the crystalline planes exhibits a magnetoresistance as large as 10,000%. The evolution of the magnetoresistance with magnetic field and temperature reveals that the phenomenon originates from multiple transitions to different magnetic states, whose possible microscopic nature is discussed on the basis of all existing experimental observations. This observed dependence of the conductance of a tunnel barrier on its magnetic state is a phenomenon that demonstrates the presence of a strong coupling between transport and magnetism in magnetic van der Waals semiconductors.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Magnetic layered van der Waals crystals are an emerging class of materials giving access to new physical phenomena, as illustrated by the recent observation of 2D ferromagnetism in Cr2Ge2Te6 and CrI3. Of particular interest in semiconductors is the interplay between magnetism and transport, which has remained unexplored. Here we report magneto-transport measurements on exfoliated CrI3 crystals. We find that tunneling conduction in the direction perpendicular to the crystalline planes exhibits a magnetoresistance as large as 10,000%. The evolution of the magnetoresistance with magnetic field and temperature reveals that the phenomenon originates from multiple transitions to different magnetic states, whose possible microscopic nature is discussed on the basis of all existing experimental observations. This observed dependence of the conductance of a tunnel barrier on its magnetic state is a phenomenon that demonstrates the presence of a strong coupling between transport and magnetism in magnetic van der Waals semiconductors. |
Tamagnone Michele; Slipchenko Tetiana M.; Moldovan Clara; Liu Peter Q.; Centeno Alba; Hasani Hamed; Zurutuza Amaia; Ionescu Adrian M.; Martin-Moreno Luis; Faist Jérôme; Mosig Juan R.; Kuzmenko Alexey B.; Poumirol Jean-Marie Magnetoplasmonic enhancement of Faraday rotation in patterned graphene metasurfaces Journal Article Phys. Rev. B, 97 (24), pp. 241410, 2018. @article{Michele2018, title = {Magnetoplasmonic enhancement of Faraday rotation in patterned graphene metasurfaces}, author = {Tamagnone Michele and Slipchenko Tetiana M. and Moldovan Clara and Liu Peter Q. and Centeno Alba and Hasani Hamed and Zurutuza Amaia and Ionescu Adrian M. and Martin-Moreno Luis and Faist Jérôme and Mosig Juan R. and Kuzmenko Alexey B. and Poumirol Jean-Marie}, url = {https://link.aps.org/doi/10.1103/PhysRevB.97.241410}, doi = {10.1103/PhysRevB.97.241410}, year = {2018}, date = {2018-06-26}, journal = {Phys. Rev. B}, volume = {97}, number = {24}, pages = {241410}, abstract = {Faraday rotation is a fundamental property present in all nonreciprocal optical elements. In the THz range, graphene displays strong Faraday rotation; unfortunately, it is limited to frequencies below the cyclotron resonance. Here, we show experimentally that in specifically designed metasurfaces, magnetoplasmons can be used to circumvent this limitation. We find excellent agreement between theory and experiment and provide physical insights and predictions on these phenomena. Finally, we demonstrate strong tunability in these metasurfaces using electric and magnetic field biasing.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Faraday rotation is a fundamental property present in all nonreciprocal optical elements. In the THz range, graphene displays strong Faraday rotation; unfortunately, it is limited to frequencies below the cyclotron resonance. Here, we show experimentally that in specifically designed metasurfaces, magnetoplasmons can be used to circumvent this limitation. We find excellent agreement between theory and experiment and provide physical insights and predictions on these phenomena. Finally, we demonstrate strong tunability in these metasurfaces using electric and magnetic field biasing. |
Liang Yang; Jing Tian; Henry Giddens; Jean-Marie Poumirol; JingBo Wu; Alexey B. Kuzmenko; Yang Hao Magnetically tunable graphene-based reflector under linear polarized incidence at room temperature Journal Article Applied Physics Letters, 112 (15), pp. 151103, 2018. @article{Yang2018, title = {Magnetically tunable graphene-based reflector under linear polarized incidence at room temperature}, author = {Liang Yang and Jing Tian and Henry Giddens and Jean-Marie Poumirol and JingBo Wu and Alexey B. Kuzmenko and Yang Hao}, url = {https://aip.scitation.org/doi/abs/10.1063/1.5022774}, doi = {10.1063/1.5022774}, year = {2018}, date = {2018-06-13}, journal = {Applied Physics Letters}, volume = {112}, number = {15}, pages = {151103}, abstract = {At the terahertz spectrum, the 2D material graphene has diagonal and Hall conductivities in the presence of a magnetic field. These peculiar properties provide graphene-based structures with a magnetically tunable response to electromagnetic waves. In this work, the absolute reflection intensity was measured for a graphene-based reflector illuminated by linearly polarized incident waves at room temperature, which demonstrated the intensity modulation depth (IMD) under different magnetostatic biases by up to 15%. Experimental data were fitted and analyzed by a modified equivalent circuit model. In addition, as an important phenomenon of the graphene gyrotropic response, Kerr rotation is discussed according to results achieved from full-wave simulations. It is concluded that the IMD is reduced for the best Kerr rotation in the proposed graphene-based reflector.}, keywords = {}, pubstate = {published}, tppubtype = {article} } At the terahertz spectrum, the 2D material graphene has diagonal and Hall conductivities in the presence of a magnetic field. These peculiar properties provide graphene-based structures with a magnetically tunable response to electromagnetic waves. In this work, the absolute reflection intensity was measured for a graphene-based reflector illuminated by linearly polarized incident waves at room temperature, which demonstrated the intensity modulation depth (IMD) under different magnetostatic biases by up to 15%. Experimental data were fitted and analyzed by a modified equivalent circuit model. In addition, as an important phenomenon of the graphene gyrotropic response, Kerr rotation is discussed according to results achieved from full-wave simulations. It is concluded that the IMD is reduced for the best Kerr rotation in the proposed graphene-based reflector. |
D. Matera; M. Bonura; C. Barth; A. Fete; R. Černý; E. Giannini; C. Senatore Rapid synthesis of MgB2 by inductive heating Journal Article IEEE Transactions on Applied Superconductivity, 28 (4), pp. 1-5, 2018. @article{Matera2018, title = {Rapid synthesis of MgB2 by inductive heating}, author = {D. Matera and M. Bonura and C. Barth and A. Fete and R. Černý and E. Giannini and C. Senatore}, doi = {10.1109/TASC.2018.2798299}, year = {2018}, date = {2018-06-10}, journal = {IEEE Transactions on Applied Superconductivity}, volume = {28}, number = {4}, pages = {1-5}, abstract = {The effect of a rapid internal magnesium diffusion synthesis on the electrical, magnetic, and microstructural properties of binary MgB 2 bulk samples has been investigated. We have used a laboratory-made induction furnace to reduce the reaction time, typically of many hours, to few minutes. We report a comparison between two samples reacted at the same temperature with the induction furnace and with a commercial resistance oven. We have observed that the critical temperature and the width of the superconducting transition are not affected by the heat treatment. The induction heating leads to an increase of the critical current density at high fields, correlated with an enhancement of the upper critical field. This paper exposes the potentiality of the proposed fast process, which allows tuning the parameters of the heat treatment in ranges that would not be accessible with traditional ovens. The technique can be scaled for the preparation of wires and powders.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The effect of a rapid internal magnesium diffusion synthesis on the electrical, magnetic, and microstructural properties of binary MgB 2 bulk samples has been investigated. We have used a laboratory-made induction furnace to reduce the reaction time, typically of many hours, to few minutes. We report a comparison between two samples reacted at the same temperature with the induction furnace and with a commercial resistance oven. We have observed that the critical temperature and the width of the superconducting transition are not affected by the heat treatment. The induction heating leads to an increase of the critical current density at high fields, correlated with an enhancement of the upper critical field. This paper exposes the potentiality of the proposed fast process, which allows tuning the parameters of the heat treatment in ranges that would not be accessible with traditional ovens. The technique can be scaled for the preparation of wires and powders. |
B. Hildebrand, T. Jaouen, M.-L. Mottas, G. Monney, C. Barreteau, E. Giannini, D. R. Bowler, P. Aebi: “”, Local Real-Space View of the Achiral 1T-TiSe2 2 x 2 x 2 Charge Density Wave Journal Article Physical Review Letters, 120 (13), pp. 136404, 2018. @article{Hildebrand2018, title = {Local Real-Space View of the Achiral 1T-TiSe2 2 x 2 x 2 Charge Density Wave}, author = {B. Hildebrand, T. Jaouen, M.-L. Mottas, G. Monney, C. Barreteau, E. Giannini, D. R. Bowler, P. Aebi: “”,}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.120.136404}, doi = {10.1103/PhysRevLett.120.136404}, year = {2018}, date = {2018-03-30}, journal = {Physical Review Letters}, volume = {120}, number = {13}, pages = {136404}, abstract = {The transition metal dichalcogenide 1T−TiSe2-two-dimensional layered material undergoing a commensurate 2×2×2 charge density wave (CDW) transition with a weak periodic lattice distortion (PLD) below ≈200 K. Scanning tunneling microscopy (STM) combined with intentionally introduced interstitial Ti atoms allows us to go beyond the usual spatial resolution of STM and to intimately probe the three-dimensional character of the PLD. Furthermore, the inversion-symmetric achiral nature of the CDW in the z direction is revealed, contradicting the claimed existence of helical CDW stacking and associated chiral order. This study paves the way to a simultaneous real-space probing of both charge and structural reconstructions in CDW compounds}, keywords = {}, pubstate = {published}, tppubtype = {article} } The transition metal dichalcogenide 1T−TiSe2-two-dimensional layered material undergoing a commensurate 2×2×2 charge density wave (CDW) transition with a weak periodic lattice distortion (PLD) below ≈200 K. Scanning tunneling microscopy (STM) combined with intentionally introduced interstitial Ti atoms allows us to go beyond the usual spatial resolution of STM and to intimately probe the three-dimensional character of the PLD. Furthermore, the inversion-symmetric achiral nature of the CDW in the z direction is revealed, contradicting the claimed existence of helical CDW stacking and associated chiral order. This study paves the way to a simultaneous real-space probing of both charge and structural reconstructions in CDW compounds |
G Gäumann; I Crassee; N Numan; M Tamagnone; J R Mosig; J-M Poumirol; J-P Wolf; T Feurer Nonlinear THz spectroscopy and simulation of gated graphene Journal Article Journal of Physics Communications, 2 (6), pp. 065016, 2018. @article{2399-6528-2-6-065016, title = {Nonlinear THz spectroscopy and simulation of gated graphene}, author = {G Gäumann and I Crassee and N Numan and M Tamagnone and J R Mosig and J-M Poumirol and J-P Wolf and T Feurer}, url = {http://stacks.iop.org/2399-6528/2/i=6/a=065016}, year = {2018}, date = {2018-01-01}, journal = {Journal of Physics Communications}, volume = {2}, number = {6}, pages = {065016}, abstract = {We studied the nonlinear optical properties of single layer graphene using high terahertz (THz) fields. With the use of a back gate and cooling down the sample to cryogenic temperatures we are able to spectrally probe the nonlinear THz properties of intrinsic to highly doped graphene. The carrier density strongly affects the nonlinear properties of graphene; in the low doping and high THz field regime, an increase of the transmission on the order of 4% is found in our experiments. At higher doping levels we observe a larger relative nonlinear response: the larger the doping in the single layer the larger the relative field induced increase in transmission becomes. In all experiments, the THz field is opposing the effect of the gate, but field effects are never larger than the doping effects. We use the thermodynamical model for a hot electron gas also used by Mics et al (2015 Nat. Commun. 6 7655) to simulate our data and study the effects of doping on the nonlinear properties of single layer graphene. We find that the highest carrier temperatures are obtained in low doped graphene. The model shows a good qualitative agreement with our data for high doping levels. Nevertheless our results demonstrate the limitation of the model for low doping levels. Our results are a road map for further explorations for the control of nonlinear light–matter interaction and functionalization of graphene layers in active THz devices in which carrier temperature and saturable absorption play a role.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We studied the nonlinear optical properties of single layer graphene using high terahertz (THz) fields. With the use of a back gate and cooling down the sample to cryogenic temperatures we are able to spectrally probe the nonlinear THz properties of intrinsic to highly doped graphene. The carrier density strongly affects the nonlinear properties of graphene; in the low doping and high THz field regime, an increase of the transmission on the order of 4% is found in our experiments. At higher doping levels we observe a larger relative nonlinear response: the larger the doping in the single layer the larger the relative field induced increase in transmission becomes. In all experiments, the THz field is opposing the effect of the gate, but field effects are never larger than the doping effects. We use the thermodynamical model for a hot electron gas also used by Mics et al (2015 Nat. Commun. 6 7655) to simulate our data and study the effects of doping on the nonlinear properties of single layer graphene. We find that the highest carrier temperatures are obtained in low doped graphene. The model shows a good qualitative agreement with our data for high doping levels. Nevertheless our results demonstrate the limitation of the model for low doping levels. Our results are a road map for further explorations for the control of nonlinear light–matter interaction and functionalization of graphene layers in active THz devices in which carrier temperature and saturable absorption play a role. |
D. van der Marel Order on command Journal Article Physics, 10 (127), 2017. @article{vanderMarel2017, title = {Order on command}, author = {D. van der Marel}, url = {https://physics.aps.org/articles/v10/127}, doi = {10.1103/Physics.10.127}, year = {2017}, date = {2017-11-27}, journal = {Physics}, volume = {10}, number = {127}, abstract = {A current of electrons with aligned spins can be used to modify magnetic order and superconductivity in an iron-based superconductor. }, keywords = {}, pubstate = {published}, tppubtype = {article} } A current of electrons with aligned spins can be used to modify magnetic order and superconductivity in an iron-based superconductor. |
D. Valentinis; S. Gariglio; A. Fête; J.-M. Triscone; C. Berthod; D. van der Marel Modulation of the superconducting critical temperature due to quantum confinement at the LaAlO3/SrTiO3 interface Journal Article Physical Review B, 96 , pp. 094518, 2017. @article{Valentinis2017, title = {Modulation of the superconducting critical temperature due to quantum confinement at the LaAlO3/SrTiO3 interface}, author = {D. Valentinis and S. Gariglio and A. Fête and J.-M. Triscone and C. Berthod and D. van der Marel}, editor = {APS}, url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.094518}, doi = {10.1103/PhysRevB.96.094518}, year = {2017}, date = {2017-09-18}, journal = {Physical Review B}, volume = {96}, pages = {094518}, abstract = {Superconductivity develops in bulk doped SrTiO3 and at the LaAlO3/SrTiO3 interface with a dome-shaped density dependence of the critical temperature Tc, despite different dimensionalities and geometries. We propose that the Tc dome of LaAlO3/SrTiO3 is a shape resonance due to quantum confinement of superconducting bulk SrTiO3. We substantiate this interpretation by comparing the exact solutions of a three-dimensional and quasi-two-dimensional two-band BCS gap equation. This comparison highlights the role of heavy bands for Tc in both geometries. For bulk SrTiO3, we extract the density dependence of the pairing interaction from the fit to experimental data. We apply quantum confinement in a square potential well of finite depth and calculate Tc in the confined configuration. We compare the calculated Tc to transport experiments and provide an explanation as to why the optimal Tc’s are so close to each other in two-dimensional interfaces and the three-dimensional bulk material. }, keywords = {}, pubstate = {published}, tppubtype = {article} } Superconductivity develops in bulk doped SrTiO3 and at the LaAlO3/SrTiO3 interface with a dome-shaped density dependence of the critical temperature Tc, despite different dimensionalities and geometries. We propose that the Tc dome of LaAlO3/SrTiO3 is a shape resonance due to quantum confinement of superconducting bulk SrTiO3. We substantiate this interpretation by comparing the exact solutions of a three-dimensional and quasi-two-dimensional two-band BCS gap equation. This comparison highlights the role of heavy bands for Tc in both geometries. For bulk SrTiO3, we extract the density dependence of the pairing interaction from the fit to experimental data. We apply quantum confinement in a square potential well of finite depth and calculate Tc in the confined configuration. We compare the calculated Tc to transport experiments and provide an explanation as to why the optimal Tc’s are so close to each other in two-dimensional interfaces and the three-dimensional bulk material. |
Borroni, S.; Baldini, E.; Katukuri, V. M.; Mann, A.; Parlinski, K.; Legut, D.; Arrell, C.; van Mourik, F.; Teyssier, J.; Kozlowski, A.; Piekarz, P.; Yazyev, O. V.; Oleifmmode, A. M.; Lorenzana, J.; Carbone, F. Coherent generation of symmetry-forbidden phonons by light-induced electron-phonon interactions in magnetite Journal Article Phys. Rev. B, 96 , pp. 104308, 2017. @article{PhysRevB.96.104308, title = {Coherent generation of symmetry-forbidden phonons by light-induced electron-phonon interactions in magnetite}, author = {Borroni, S. and Baldini, E. and Katukuri, V. M. and Mann, A. and Parlinski, K. and Legut, D. and Arrell, C. and van Mourik, F. and Teyssier, J. and Kozlowski, A. and Piekarz, P. and Yazyev, O. V. and Oleifmmode, A. M. and Lorenzana, J. and Carbone, F.}, url = {https://link.aps.org/doi/10.1103/PhysRevB.96.104308}, doi = {10.1103/PhysRevB.96.104308}, year = {2017}, date = {2017-09-01}, journal = {Phys. Rev. B}, volume = {96}, pages = {104308}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Baldini E.; Mann A.; Benfatto L.; Cappelluti E.; Acocella A.; Silkin V. M.; Eremeev S. V.; Kuzmenko A. B.; Borroni S.; Tan T.; Xi X. X.; Zerbetto F.; Merlin R.; Carbone F. Real-Time Observation of Phonon-Mediated σ-π Interband Scattering in MgB2 Journal Article Phys. Rev. Lett., 119 (9), pp. 097002, 2017. @article{E.2017, title = {Real-Time Observation of Phonon-Mediated σ-π Interband Scattering in MgB2}, author = {Baldini E. and Mann A. and Benfatto L. and Cappelluti E. and Acocella A. and Silkin V. M. and Eremeev S. V. and Kuzmenko A. B. and Borroni S. and Tan T. and Xi X. X. and Zerbetto F. and Merlin R. and Carbone F.}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.119.097002}, doi = {10.1103/PhysRevLett.119.097002}, year = {2017}, date = {2017-08-31}, journal = {Phys. Rev. Lett.}, volume = {119}, number = {9}, pages = {097002}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ubrig Nicolas; Jo Sanghyun; Philippi Marc; Costanzo Davide; Berger Helmuth; Kuzmenko Alexey B; Morpurgo Alberto F Microscopic Origin of the Valley Hall Effect in Transition Metal Dichalcogenides Revealed by Wavelength-Dependent Mapping Journal Article Nano Letters, 17 (9), pp. 5719-5725, 2017, ISSN: 1530-6984. @article{Nicolas2017, title = {Microscopic Origin of the Valley Hall Effect in Transition Metal Dichalcogenides Revealed by Wavelength-Dependent Mapping}, author = {Ubrig Nicolas and Jo Sanghyun and Philippi Marc and Costanzo Davide and Berger Helmuth and Kuzmenko Alexey B and Morpurgo Alberto F}, url = {https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.7b02666}, doi = {10.1021/acs.nanolett.7b02666}, issn = {1530-6984}, year = {2017}, date = {2017-08-27}, journal = {Nano Letters}, volume = {17}, number = {9}, pages = {5719-5725}, abstract = {The band structure of many semiconducting monolayer transition metal dichalcogenides (TMDs) possesses two degenerate valleys with equal and opposite Berry curvature. It has been predicted that, when illuminated with circularly polarized light, interband transitions generate an unbalanced nonequilibrium population of electrons and holes in these valleys, resulting in a finite Hall voltage at zero magnetic field when a current flows through the system. This is the so-called valley Hall effect that has recently been observed experimentally. Here, we show that this effect is mediated by photogenerated neutral excitons and charged trions and not by interband transitions generating independent electrons and holes. We further demonstrate an experimental strategy, based on wavelength dependent spatial mapping of the Hall voltage, which allows the exciton and trion contributions to the valley Hall effect to be discriminated in the measurement. These results represent a significant step forward in our understanding of the microscopic origin of photoinduced valley Hall effect in semiconducting transition metal dichalcogenides and demonstrate experimentally that composite quasi-particles, such as trions, can also possess a finite Berry curvature.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The band structure of many semiconducting monolayer transition metal dichalcogenides (TMDs) possesses two degenerate valleys with equal and opposite Berry curvature. It has been predicted that, when illuminated with circularly polarized light, interband transitions generate an unbalanced nonequilibrium population of electrons and holes in these valleys, resulting in a finite Hall voltage at zero magnetic field when a current flows through the system. This is the so-called valley Hall effect that has recently been observed experimentally. Here, we show that this effect is mediated by photogenerated neutral excitons and charged trions and not by interband transitions generating independent electrons and holes. We further demonstrate an experimental strategy, based on wavelength dependent spatial mapping of the Hall voltage, which allows the exciton and trion contributions to the valley Hall effect to be discriminated in the measurement. These results represent a significant step forward in our understanding of the microscopic origin of photoinduced valley Hall effect in semiconducting transition metal dichalcogenides and demonstrate experimentally that composite quasi-particles, such as trions, can also possess a finite Berry curvature. |
A. Tamai; Q. S. Wu; I. Cucchi; F. Y. Bruno; S. Riccò; T. K. Kim; M. Hoesch; C. Barreteau; E. Giannini; C. Besnard; A. A. Soluyanov; F. Baumberger Fermi Arcs and Their Topological Character in the Candidate Type-II Weyl Semimetal MoTe2 Journal Article Physical Review X, 6 (3), pp. 031021, 2017. @article{Tamai2017, title = {Fermi Arcs and Their Topological Character in the Candidate Type-II Weyl Semimetal MoTe2}, author = {A. Tamai and Q. S. Wu and I. Cucchi and F. Y. Bruno and S. Riccò and T. K. Kim and M. Hoesch and C. Barreteau and E. Giannini and C. Besnard and A. A. Soluyanov and F. Baumberger}, doi = {10.1103/PhysRevX.6.031021}, year = {2017}, date = {2017-08-17}, journal = {Physical Review X}, volume = {6}, number = {3}, pages = {031021}, abstract = {We report a combined experimental and theoretical study of the candidate type-II Weyl semimetal MoTe2. Using laser-based angle-resolved photoemission, we resolve multiple distinct Fermi arcs on the inequivalent top and bottom (001) surfaces. All surface states observed experimentally are reproduced by an electronic structure calculation for the experimental crystal structure that predicts a topological Weyl semimetal state with eight type-II Weyl points. We further use systematic electronic structure calculations simulating different Weyl point arrangements to discuss the robustness of the identified Weyl semimetal state and the topological character of Fermi arcs in MoTe2.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We report a combined experimental and theoretical study of the candidate type-II Weyl semimetal MoTe2. Using laser-based angle-resolved photoemission, we resolve multiple distinct Fermi arcs on the inequivalent top and bottom (001) surfaces. All surface states observed experimentally are reproduced by an electronic structure calculation for the experimental crystal structure that predicts a topological Weyl semimetal state with eight type-II Weyl points. We further use systematic electronic structure calculations simulating different Weyl point arrangements to discuss the robustness of the identified Weyl semimetal state and the topological character of Fermi arcs in MoTe2. |
Ruppen, J.; Teyssier, J.; Ardizzone, I.; Peil, O. E.; Catalano, S.; Gibert, M.; Triscone, J.-M.; Georges, A.; van der Marel, D. Impact of antiferromagnetism on the optical properties of rare-earth nickelates Journal Article Phys. Rev. B, 96 , pp. 045120, 2017. @article{PhysRevB.96.045120, title = {Impact of antiferromagnetism on the optical properties of rare-earth nickelates}, author = {Ruppen, J. and Teyssier, J. and Ardizzone, I. and Peil, O. E. and Catalano, S. and Gibert, M. and Triscone, J.-M. and Georges, A. and van der Marel, D.}, url = {https://link.aps.org/doi/10.1103/PhysRevB.96.045120}, doi = {10.1103/PhysRevB.96.045120}, year = {2017}, date = {2017-07-01}, journal = {Phys. Rev. B}, volume = {96}, pages = {045120}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. Matera; M. Bonura; E. Giannini; C. Senatore Electrical Connectivity in MgB2: The Role of Precursors and Processing Routes in Controlling Voids and Detrimental Secondary Phases C Journal Article IEEE Transactions on Applied Superconductivity, 27 (4), pp. 1-6, 2017. @article{Matera2017, title = {Electrical Connectivity in MgB2: The Role of Precursors and Processing Routes in Controlling Voids and Detrimental Secondary Phases C}, author = {D. Matera and M. Bonura and E. Giannini and C. Senatore}, doi = {10.1109/TASC.2017.2654545}, year = {2017}, date = {2017-06-01}, journal = {IEEE Transactions on Applied Superconductivity}, volume = {27}, number = {4}, pages = {1-6}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Manisha Chhikara; Iaroslav Gaponenko; Patrycja Paruch; Alexey B Kuzmenko Effect of uniaxial strain on the optical Drude scattering in graphene Journal Article 2D Materials, 4 (2), pp. 025081, 2017. @article{Chhikara2017, title = {Effect of uniaxial strain on the optical Drude scattering in graphene}, author = {Manisha Chhikara and Iaroslav Gaponenko and Patrycja Paruch and Alexey B Kuzmenko}, url = {https://doi.org/10.1088%2F2053-1583%2Faa6c10}, doi = {10.1088/2053-1583/aa6c10}, year = {2017}, date = {2017-04-28}, journal = {2D Materials}, volume = {4}, number = {2}, pages = {025081}, abstract = {Graphene is a mechanically robust 2D material promising for flexible optoelectronic applications. However, its electromagnetic properties under strain are experimentally poorly understood. Here we present the far-infrared transmission spectra of large-area chemical-vapor deposited monolayer graphene on a polyethylene terephthalate substrate subjected to uniaxial strain. The effective strain value is calibrated using the Raman spectroscopy and corrected for a relaxation of wrinkles and folds seen directly by atomic-force microscopy. We find that while the Drude weight and the Fermi level remain constant, the scattering rate increases by more than 10% per 1% of applied strain, showing a high level of reproducibility during strain cycling. As a result, the electronic mobility and optical absorption of graphene at terahertz and lower frequencies appear to also be sensitive to strain, which opens pathways to control these key parameters mechanically. We suggest that such a functionality can be potentially used in flexible optoelectronic and microelectromechanical systems based on graphene. By combining our findings with existing theoretical models, we discuss the possible mechanisms of strain-controlled Drude scattering.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Graphene is a mechanically robust 2D material promising for flexible optoelectronic applications. However, its electromagnetic properties under strain are experimentally poorly understood. Here we present the far-infrared transmission spectra of large-area chemical-vapor deposited monolayer graphene on a polyethylene terephthalate substrate subjected to uniaxial strain. The effective strain value is calibrated using the Raman spectroscopy and corrected for a relaxation of wrinkles and folds seen directly by atomic-force microscopy. We find that while the Drude weight and the Fermi level remain constant, the scattering rate increases by more than 10% per 1% of applied strain, showing a high level of reproducibility during strain cycling. As a result, the electronic mobility and optical absorption of graphene at terahertz and lower frequencies appear to also be sensitive to strain, which opens pathways to control these key parameters mechanically. We suggest that such a functionality can be potentially used in flexible optoelectronic and microelectromechanical systems based on graphene. By combining our findings with existing theoretical models, we discuss the possible mechanisms of strain-controlled Drude scattering. |
B. Hildebrand; T. Jaoue; C. Didiot; E. Razzoli; G. Monney; M.-L. Mottas, F. Vanini; C. Barreteau; A. Ubaldini; E. Giannini; H. Berger; D. R. Bowler; P. Aebi Local resilience of the 1T-TiSe2 charge density wave to Ti self-doping Journal Article Physical Review B, 95 (8), pp. 081104, 2017. @article{Hildebrand2017, title = {Local resilience of the 1T-TiSe2 charge density wave to Ti self-doping}, author = {B. Hildebrand and T. Jaoue and C. Didiot and E. Razzoli and G. Monney and M.-L. Mottas, F. Vanini and C. Barreteau and A. Ubaldini and E. Giannini and H. Berger and D. R. Bowler and P. Aebi}, doi = {10.1103/PhysRevB.95.081104}, year = {2017}, date = {2017-02-02}, journal = {Physical Review B}, volume = {95}, number = {8}, pages = {081104}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J.-M. Poumirol; P. Q. Liu; T. M. Slipchenko; A. Y. Nikitin; L. Martin-Moreno; J. Faist; A. B. Kuzmenko Electrically controlled terahertz magneto-optical phenomena in continuous and patterned graphene Journal Article Nature Communications, 8 (14626), 2017. @article{Poumirol2017, title = {Electrically controlled terahertz magneto-optical phenomena in continuous and patterned graphene}, author = {J.-M. Poumirol and P. Q. Liu and T. M. Slipchenko and A. Y. Nikitin and L. Martin-Moreno and J. Faist and A. B. Kuzmenko}, editor = {Nature}, url = {http://www.nature.com/articles/ncomms14626}, doi = {10.1038/ncomms14626}, year = {2017}, date = {2017-01-18}, journal = {Nature Communications}, volume = {8}, number = {14626}, abstract = {The magnetic circular dichroism and the Faraday rotation are the fundamental phenomena of great practical importance arising from the breaking of the time reversal symmetry by a magnetic field. In most materials, the strength and the sign of these effects can be only controlled by the field value and its orientation. Furthermore, the terahertz range is lacking materials having the ability to affect the polarization state of the light in a non-reciprocal manner. Here we demonstrate, using broadband terahertz magneto-electro-optical spectroscopy, that in graphene both the magnetic circular dichroism and the Faraday rotation can be modulated in intensity, tuned in frequency and, importantly, inverted using only electrostatic doping at a fixed magnetic field. In addition, we observe strong magneto-plasmonic resonances in a patterned array of graphene antidots, which potentially allows exploiting these magneto-optical phenomena in a broad THz range.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The magnetic circular dichroism and the Faraday rotation are the fundamental phenomena of great practical importance arising from the breaking of the time reversal symmetry by a magnetic field. In most materials, the strength and the sign of these effects can be only controlled by the field value and its orientation. Furthermore, the terahertz range is lacking materials having the ability to affect the polarization state of the light in a non-reciprocal manner. Here we demonstrate, using broadband terahertz magneto-electro-optical spectroscopy, that in graphene both the magnetic circular dichroism and the Faraday rotation can be modulated in intensity, tuned in frequency and, importantly, inverted using only electrostatic doping at a fixed magnetic field. In addition, we observe strong magneto-plasmonic resonances in a patterned array of graphene antidots, which potentially allows exploiting these magneto-optical phenomena in a broad THz range. |
I. Crassee; F. Borondics; M. K. Tran; G. Autès; A. Magrez; P. Bugnon; H. Berger; J. Teyssier; O. V. Yazyev; M. Orlita; A. Akrap BiTeCl and BiTeBr: A comparative high-pressure optical study Journal Article Physical Review B, 95 , pp. 045201, 2017. @article{Crassee2017, title = {BiTeCl and BiTeBr: A comparative high-pressure optical study}, author = {I. Crassee and F. Borondics and M. K. Tran and G. Autès and A. Magrez and P. Bugnon and H. Berger and J. Teyssier and O. V. Yazyev and M. Orlita and A. Akrap}, editor = {APS}, url = {http://journals.aps.org/prb/abstract/10.1103/PhysRevB.95.045201}, doi = {10.1103/PhysRevB.95.045201}, year = {2017}, date = {2017-01-10}, journal = {Physical Review B}, volume = {95}, pages = {045201}, abstract = {We here report a detailed high-pressure infrared transmission study of BiTeCl and BiTeBr. We follow the evolution of two band transitions: the optical excitation β between two Rashba-split conduction bands, and the absorption γ across the band gap. In the low-pressure range, p<4 GPa, for both compounds β is approximately constant with pressure and γ decreases, in agreement with band structure calculations. In BiTeCl, a clear pressure-induced phase transition at 6 GPa leads to a different ground state. For BiTeBr, the pressure evolution is more subtle, and we discuss the possibility of closing and reopening of the band gap. Our data is consistent with a potential Weyl phase in BiTeBr at 5–6 GPa, followed by the onset of a structural phase transition above 7 GPa.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We here report a detailed high-pressure infrared transmission study of BiTeCl and BiTeBr. We follow the evolution of two band transitions: the optical excitation β between two Rashba-split conduction bands, and the absorption γ across the band gap. In the low-pressure range, p<4 GPa, for both compounds β is approximately constant with pressure and γ decreases, in agreement with band structure calculations. In BiTeCl, a clear pressure-induced phase transition at 6 GPa leads to a different ground state. For BiTeBr, the pressure evolution is more subtle, and we discuss the possibility of closing and reopening of the band gap. Our data is consistent with a potential Weyl phase in BiTeBr at 5–6 GPa, followed by the onset of a structural phase transition above 7 GPa. |
A.M. Novello; M. Spera; A. Scarfato; A. Ubaldini; E. Giannini; D.R. Bowler; C. Renner Stripe and short range order in the charge density wave of 1T-CuxTiSe2 Journal Article Physical Review Letters, 118 (1), pp. 017002, 2017. @article{Novello2017, title = {Stripe and short range order in the charge density wave of 1T-CuxTiSe2}, author = {A.M. Novello and M. Spera and A. Scarfato and A. Ubaldini and E. Giannini and D.R. Bowler and C. Renner}, doi = {10.1103/PhysRevLett.118.017002}, year = {2017}, date = {2017-01-03}, journal = {Physical Review Letters}, volume = {118}, number = {1}, pages = {017002}, abstract = {We study the impact of Cu intercalation on the charge density wave (CDW) in 1T−CuxTiSe2 by scanning tunneling microscopy and spectroscopy. Cu atoms, identified through density functional theory modeling, are found to intercalate randomly on the octahedral site in the van der Waals gap and to dope delocalized electrons near the Fermi level. While the CDW modulation period does not depend on Cu content, we observe the formation of charge stripe domains at low Cu content (x<0.02) and a breaking up of the commensurate order into 2×2 domains at higher Cu content. The latter shrink with increasing Cu concentration and tend to be phase shifted. These findings invalidate a proposed excitonic pairing as the primary CDW formation mechanism in this material. }, keywords = {}, pubstate = {published}, tppubtype = {article} } We study the impact of Cu intercalation on the charge density wave (CDW) in 1T−CuxTiSe2 by scanning tunneling microscopy and spectroscopy. Cu atoms, identified through density functional theory modeling, are found to intercalate randomly on the octahedral site in the van der Waals gap and to dope delocalized electrons near the Fermi level. While the CDW modulation period does not depend on Cu content, we observe the formation of charge stripe domains at low Cu content (x<0.02) and a breaking up of the commensurate order into 2×2 domains at higher Cu content. The latter shrink with increasing Cu concentration and tend to be phase shifted. These findings invalidate a proposed excitonic pairing as the primary CDW formation mechanism in this material. |
N. Bachar; D. Stricker; S. Muleady; K. Wang; J. A. Mydosh; Y. K. Huang; D. van der Marel Detailed optical spectroscopy of hybridization gap and hidden-order transition in high-quality URu2Si2 single crystals Journal Article Physical Review B, 94 , pp. 235101, 2016. @article{Bachar2016, title = {Detailed optical spectroscopy of hybridization gap and hidden-order transition in high-quality URu2Si2 single crystals}, author = {N. Bachar and D. Stricker and S. Muleady and K. Wang and J. A. Mydosh and Y. K. Huang and D. van der Marel}, editor = {APS}, url = {http://journals.aps.org/prb/abstract/10.1103/PhysRevB.94.235101}, doi = {10.1103/PhysRevB.94.235101}, year = {2016}, date = {2016-12-01}, journal = {Physical Review B}, volume = {94}, pages = {235101}, abstract = {We present a detailed temperature and frequency dependence of the optical conductivity measured on clean high-quality single crystals of URu2Si2 of ac− and ab-plane surfaces. Our data demonstrate the itinerant character of the narrow 5f bands, becoming progressively coherent as the temperature is lowered below a crossover temperature T∗∼75 K. T∗ is higher than in previous reports as a result of a different sample preparation, which minimizes residual strain. We furthermore present the density-response (energy-loss) function of this compound, and determine the energies of the heavy-fermion plasmons with a− and c-axis polarization. Our observation of a suppression of optical conductivity below 50 meV along both the a and c axes, along with a heavy-fermion plasmon at 18 meV, points toward the emergence of a band of coherent charge carriers crossing the Fermi energy and the emergence of a hybridization gap on part of the Fermi surface. The evolution towards coherent itinerant states is accelerated below the hidden order temperature THO=17.5 K. In the hidden order phase the low-frequency optical conductivity shows a single gap at ∼6.5 meV, which closes at THO.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We present a detailed temperature and frequency dependence of the optical conductivity measured on clean high-quality single crystals of URu2Si2 of ac− and ab-plane surfaces. Our data demonstrate the itinerant character of the narrow 5f bands, becoming progressively coherent as the temperature is lowered below a crossover temperature T∗∼75 K. T∗ is higher than in previous reports as a result of a different sample preparation, which minimizes residual strain. We furthermore present the density-response (energy-loss) function of this compound, and determine the energies of the heavy-fermion plasmons with a− and c-axis polarization. Our observation of a suppression of optical conductivity below 50 meV along both the a and c axes, along with a heavy-fermion plasmon at 18 meV, points toward the emergence of a band of coherent charge carriers crossing the Fermi energy and the emergence of a hybridization gap on part of the Fermi surface. The evolution towards coherent itinerant states is accelerated below the hidden order temperature THO=17.5 K. In the hidden order phase the low-frequency optical conductivity shows a single gap at ∼6.5 meV, which closes at THO. |
A. Stucky; G. W. Scheerer; Z. Ren; D. Jaccard; J.-M. Poumirol; C. Barreteau; E. Giannini; D. van der Marel Isotope effect in superconducting n-doped SrTiO3 Journal Article Scientific Reports, 6 (37582), 2016. @article{Stucky2016, title = {Isotope effect in superconducting n-doped SrTiO3}, author = {A. Stucky and G. W. Scheerer and Z. Ren and D. Jaccard and J.-M. Poumirol and C. Barreteau and E. Giannini and D. van der Marel}, editor = {Nature}, url = {http://www.nature.com/articles/srep37582}, doi = {10.1038/srep37582}, year = {2016}, date = {2016-11-28}, journal = {Scientific Reports}, volume = {6}, number = {37582}, abstract = {We report the influence on the superconducting critical temperature Tc in doped SrTiO3 of the substitution of the natural 16O atoms by the heavier isotope 18O. We observe that for a wide range of doping this substitution causes a strong (~50%) enhancement of Tc. Also the magnetic critical field Hc2 is increased by a factor ~2. Such a strong impact on Tc and Hc2, with a sign opposite to conventional superconductors, is unprecedented. The observed effect could be the consequence of strong coupling of the doped electrons to lattice vibrations (phonons), a notion which finds support in numerous optical and photo-emission studies. The unusually large size of the observed isotope effect supports a recent model for superconductivity in these materials based on strong coupling to the ferroelectric soft modes of SrTiO3.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We report the influence on the superconducting critical temperature Tc in doped SrTiO3 of the substitution of the natural 16O atoms by the heavier isotope 18O. We observe that for a wide range of doping this substitution causes a strong (~50%) enhancement of Tc. Also the magnetic critical field Hc2 is increased by a factor ~2. Such a strong impact on Tc and Hc2, with a sign opposite to conventional superconductors, is unprecedented. The observed effect could be the consequence of strong coupling of the doped electrons to lattice vibrations (phonons), a notion which finds support in numerous optical and photo-emission studies. The unusually large size of the observed isotope effect supports a recent model for superconductivity in these materials based on strong coupling to the ferroelectric soft modes of SrTiO3. |
L. Wang; I. Gutiérrez-Lezama; C. Barreteau; D.-K. Ki; E. Giannini; A. F. Morpurgo Direct observation of a long-range field effect from gate tuning of nonlocal conductivity Journal Article Physical Review Letters, 117 (17), pp. 176601, 2016. @article{Wang2016, title = {Direct observation of a long-range field effect from gate tuning of nonlocal conductivity}, author = {L. Wang and I. Gutiérrez-Lezama and C. Barreteau and D.-K. Ki and E. Giannini and A. F. Morpurgo}, doi = {10.1103/PhysRevLett.117.176601}, year = {2016}, date = {2016-10-19}, journal = {Physical Review Letters}, volume = {117}, number = {17}, pages = {176601}, abstract = {We report the direct observation of a long-range field effect in WTe2 devices, leading to large gate-induced changes of transport through crystals much thicker than the electrostatic screening length. The phenomenon—which manifests itself very differently from the conventional field effect—originates from the nonlocal nature of transport in the devices that are thinner than the carrier mean free path. We reproduce theoretically the gate dependence of the measured classical and quantum magnetotransport, and show that the phenomenon is caused by the gate tuning of the bulk carrier mobility by changing the scattering at the surface. Our results demonstrate experimentally the possibility to gate tune the electronic properties deep in the interior of conducting materials, avoiding limitations imposed by electrostatic screening.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We report the direct observation of a long-range field effect in WTe2 devices, leading to large gate-induced changes of transport through crystals much thicker than the electrostatic screening length. The phenomenon—which manifests itself very differently from the conventional field effect—originates from the nonlocal nature of transport in the devices that are thinner than the carrier mean free path. We reproduce theoretically the gate dependence of the measured classical and quantum magnetotransport, and show that the phenomenon is caused by the gate tuning of the bulk carrier mobility by changing the scattering at the surface. Our results demonstrate experimentally the possibility to gate tune the electronic properties deep in the interior of conducting materials, avoiding limitations imposed by electrostatic screening. |
A. Akrap; M. Hakl; S. Tchoumakov; I. Crassee; J. Kuba; M. O. Goerbig; C. C. Homes; O. Caha; J. Novák; F. Teppe; W. Desrat; S. Koohpayeh; L. Wu; N. P. Armitage; A. Nateprov; E. Arushanov; Q. D. Gibson; R. J. Cava; D. van der Marel; B. A. Piot; C. Faugeras; G. Martinez; M. Potemski; M. Orlita Magneto-Optical Signature of Massless Kane Electrons in Cd3As2 Journal Article Physical Review Letters, 117 , pp. 136401, 2016. @article{Akrap2016, title = {Magneto-Optical Signature of Massless Kane Electrons in Cd3As2}, author = {A. Akrap and M. Hakl and S. Tchoumakov and I. Crassee and J. Kuba and M. O. Goerbig and C. C. Homes and O. Caha and J. Novák and F. Teppe and W. Desrat and S. Koohpayeh and L. Wu and N. P. Armitage and A. Nateprov and E. Arushanov and Q. D. Gibson and R. J. Cava and D. van der Marel and B. A. Piot and C. Faugeras and G. Martinez and M. Potemski and M. Orlita}, editor = {APS}, url = {http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.117.136401}, doi = {10.1103/PhysRevLett.117.136401}, year = {2016}, date = {2016-09-21}, journal = {Physical Review Letters}, volume = {117}, pages = {136401}, abstract = {We report on optical reflectivity experiments performed on Cd3As2 over a broad range of photon energies and magnetic fields. The observed response clearly indicates the presence of 3D massless charge carriers. The specific cyclotron resonance absorption in the quantum limit implies that we are probing massless Kane electrons rather than symmetry-protected 3D Dirac particles. The latter may appear at a smaller energy scale and are not directly observed in our infrared experiments.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We report on optical reflectivity experiments performed on Cd3As2 over a broad range of photon energies and magnetic fields. The observed response clearly indicates the presence of 3D massless charge carriers. The specific cyclotron resonance absorption in the quantum limit implies that we are probing massless Kane electrons rather than symmetry-protected 3D Dirac particles. The latter may appear at a smaller energy scale and are not directly observed in our infrared experiments. |
F. Y. Bruno; A. Tamai; Q. S. Wu; I. Cucchi; C. Barreteau; A. de la Torre; S. McKeown Walker; S. Riccò; Z. Wang; T. K. Kim; M. Hoesch; M. Shi; N. C. Plumb; E. Giannini; A. A. Soluyanov; F. Baumberger Observation of large topologically trivial Fermi arcs in the candidate type-II Weyl semimetal WTe2 Journal Article Physical Review B, 94 (12), pp. 121112, 2016. @article{Bruno2016, title = {Observation of large topologically trivial Fermi arcs in the candidate type-II Weyl semimetal WTe2}, author = {F. Y. Bruno and A. Tamai and Q. S. Wu and I. Cucchi and C. Barreteau and A. de la Torre and S. McKeown Walker and S. Riccò and Z. Wang and T. K. Kim and M. Hoesch and M. Shi and N. C. Plumb and E. Giannini and A. A. Soluyanov and F. Baumberger}, doi = {10.1103/PhysRevB.94.121112}, year = {2016}, date = {2016-09-14}, journal = {Physical Review B}, volume = {94}, number = {12}, pages = {121112}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel Optical properties of correlated electrons Book Chapter van den E. Pavarini E. Koch, Brink J; Editors, Sawatzky G A (Ed.): 6 , Chapter 11, Forschungszentrum Jülich , Forschungszentrum Jülich, Zentralbibliothek, Verlag D-52425 Jülich (DE) , 2016, ISBN: 978-3-95806-159-0. @inbook{vanderMarel2016b, title = {Optical properties of correlated electrons}, author = {D. van der Marel}, editor = {E. Pavarini, E. Koch, J. van den Brink and G. A. Sawatzky Editors }, url = {https://www.cond-mat.de/events/correl16/manuscripts/correl16.pdf}, isbn = {978-3-95806-159-0}, year = {2016}, date = {2016-09-12}, volume = {6}, publisher = {Forschungszentrum Jülich }, address = {Forschungszentrum Jülich, Zentralbibliothek, Verlag D-52425 Jülich (DE) }, chapter = {11}, series = {Modeling and Simulation}, keywords = {}, pubstate = {published}, tppubtype = {inbook} } |
J. Levallois; M. K. Tran; D. Pouliot; C. N. Presura; L. H. Greene; J. N. Eckstein; J. Uccelli; E. Giannin; G. D. Gu; A. J. Leggett; D. van der Marel Temperature-Dependent Ellipsometry Measurements of Partial Coulomb Energy in Superconducting Cuprates Journal Article Phys. Rev. X, 6 , pp. 031027, 2016. @article{PhysRevX.6.031027, title = {Temperature-Dependent Ellipsometry Measurements of Partial Coulomb Energy in Superconducting Cuprates}, author = {J. Levallois and M. K. Tran and D. Pouliot and C. N. Presura and L. H. Greene and J. N. Eckstein and J. Uccelli and E. Giannin and G. D. Gu and A. J. Leggett and D. van der Marel}, editor = {APS}, url = {http://link.aps.org/doi/10.1103/PhysRevX.6.031027 http://archive-ouverte.unige.ch/unige:87479}, doi = {10.1103/PhysRevX.6.031027}, year = {2016}, date = {2016-08-24}, journal = {Phys. Rev. X}, volume = {6}, pages = {031027}, publisher = {American Physical Society}, abstract = {We performed an experimental study of the temperature and doping dependence of the energy-loss function of the bilayer and trilayer bismuth cuprates family. The primary aim is to obtain information on the energy stored in the Coulomb interaction between the conduction electrons, on the temperature dependence thereof, and on the change of Coulomb interaction when Cooper pairs are formed. We performed temperature-dependent ellipsometry measurements on several Bi2Sr2CaCu2O8−x single crystals: underdoped with Tc=60, 70, and 83 K; optimally doped with Tc=91 K; overdoped with Tc=84, 81, 70, and 58 K; as well as optimally doped Bi2Sr2Ca2Cu3O10+x with Tc=110 K. Our first observation is that, as the temperature drops through Tc, the loss function in the range up to 2 eV displays a change of temperature dependence as compared to the temperature dependence in the normal state. This effect at—or close to—Tc depends strongly on doping, with a sign change for weak overdoping. The size of the observed change in Coulomb energy, using an extrapolation with reasonable assumptions about its q dependence, is about the same size as the condensation energy that has been measured in these compounds. Our results therefore lend support to the notion that the Coulomb energy is an important factor for stabilizing the superconducting phase. Because of the restriction to small momentum, our observations do not exclude a possible significant contribution to the condensation energy of the Coulomb energy associated with the region of q around (π,π).}, keywords = {}, pubstate = {published}, tppubtype = {article} } We performed an experimental study of the temperature and doping dependence of the energy-loss function of the bilayer and trilayer bismuth cuprates family. The primary aim is to obtain information on the energy stored in the Coulomb interaction between the conduction electrons, on the temperature dependence thereof, and on the change of Coulomb interaction when Cooper pairs are formed. We performed temperature-dependent ellipsometry measurements on several Bi2Sr2CaCu2O8−x single crystals: underdoped with Tc=60, 70, and 83 K; optimally doped with Tc=91 K; overdoped with Tc=84, 81, 70, and 58 K; as well as optimally doped Bi2Sr2Ca2Cu3O10+x with Tc=110 K. Our first observation is that, as the temperature drops through Tc, the loss function in the range up to 2 eV displays a change of temperature dependence as compared to the temperature dependence in the normal state. This effect at—or close to—Tc depends strongly on doping, with a sign change for weak overdoping. The size of the observed change in Coulomb energy, using an extrapolation with reasonable assumptions about its q dependence, is about the same size as the condensation energy that has been measured in these compounds. Our results therefore lend support to the notion that the Coulomb energy is an important factor for stabilizing the superconducting phase. Because of the restriction to small momentum, our observations do not exclude a possible significant contribution to the condensation energy of the Coulomb energy associated with the region of q around (π,π). |
D. Valentinis; D. van der Marel; C. Berthod Rise and fall of shape resonances in thin films of BCS superconductors Journal Article Physical Review B, 94 (054516), 2016. @article{Valentinis2016b, title = {Rise and fall of shape resonances in thin films of BCS superconductors}, author = {D. Valentinis and D. van der Marel and C. Berthod}, editor = {APS}, url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.94.054516}, doi = {10.1103/PhysRevB.94.054516}, year = {2016}, date = {2016-08-23}, journal = {Physical Review B}, volume = {94}, number = {054516}, abstract = {The confinement of a superconductor in a thin film changes its Fermi-level density of states and is expected to change its critical temperature Tc. Previous calculations have reported large discontinuities of Tc when the chemical potential coincides with a subband edge. By solving the BCS gap equation exactly, we show that such discontinuities are artifacts and that Tc is a continuous function of the film thickness. We also find that Tc is reduced in thin films compared with the bulk if the confinement potential is lower than a critical value, while for stronger confinement Tc increases with decreasing film thickness, reaches a maximum, and eventually drops to zero. Our numerical results are supported by several exact solutions. We finally interpret experimental data for ultrathin lead thin films in terms of a thickness-dependent effective mass.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The confinement of a superconductor in a thin film changes its Fermi-level density of states and is expected to change its critical temperature Tc. Previous calculations have reported large discontinuities of Tc when the chemical potential coincides with a subband edge. By solving the BCS gap equation exactly, we show that such discontinuities are artifacts and that Tc is a continuous function of the film thickness. We also find that Tc is reduced in thin films compared with the bulk if the confinement potential is lower than a critical value, while for stronger confinement Tc increases with decreasing film thickness, reaches a maximum, and eventually drops to zero. Our numerical results are supported by several exact solutions. We finally interpret experimental data for ultrathin lead thin films in terms of a thickness-dependent effective mass. |
C. W. Rischau; A. Ubaldini; E. Giannini; C. J. van der Beek Charge puddles in a completely compensated topological insulator Journal Article New Journal of Physics, 18 (7), pp. 073024, 2016. @article{Rischau2016, title = {Charge puddles in a completely compensated topological insulator}, author = {C. W. Rischau and A. Ubaldini and E. Giannini and C. J. van der Beek}, url = {https://doi.org/10.1088%2F1367-2630%2F18%2F7%2F073024}, doi = {10.1088/1367-2630/18/7/073024}, year = {2016}, date = {2016-07-12}, journal = {New Journal of Physics}, volume = {18}, number = {7}, pages = {073024}, abstract = {Compensation of intrinsic charges is widely used to reduce the bulk conductivity of 3D topological insulators (TIs). Here we use low temperature electron irradiation-induced defects paired with in situ electrical transport measurements to fine-tune the degree of compensation in Bi2Te3. The coexistence of electrons and holes at the point of optimal compensation can only be explained by bulk carriers forming charge puddles. These need to be considered to understand the electric transport in compensated TI samples, irrespective of the method of compensation.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Compensation of intrinsic charges is widely used to reduce the bulk conductivity of 3D topological insulators (TIs). Here we use low temperature electron irradiation-induced defects paired with in situ electrical transport measurements to fine-tune the degree of compensation in Bi2Te3. The coexistence of electrons and holes at the point of optimal compensation can only be explained by bulk carriers forming charge puddles. These need to be considered to understand the electric transport in compensated TI samples, irrespective of the method of compensation. |
Pieter J. de Visser; Julien Levallois; Michaël K. Tran; Jean-Marie Poumirol; Ievgeniia O. Nedoliuk; Jérémie Teyssier; Ctirad Uher; Dirk van der Marel; Alexey B. Kuzmenko Suppressed Magnetic Circular Dichroism and Valley-Selective Magnetoabsorption due to the Effective Mass Anisotropy in Bismuth Journal Article Physical Review Letters, 117 (017402), 2016. @article{deVisser2016, title = {Suppressed Magnetic Circular Dichroism and Valley-Selective Magnetoabsorption due to the Effective Mass Anisotropy in Bismuth}, author = {Pieter J. de Visser and Julien Levallois and Michaël K. Tran and Jean-Marie Poumirol and Ievgeniia O. Nedoliuk and Jérémie Teyssier and Ctirad Uher and Dirk van der Marel and Alexey B. Kuzmenko}, editor = {APS}, url = {http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.117.017402}, doi = {http://dx.doi.org/10.1103/PhysRevLett.117.017402}, year = {2016}, date = {2016-06-29}, journal = {Physical Review Letters}, volume = {117}, number = {017402}, abstract = {We measure the far-infrared reflectivity and Kerr angle spectra on a high-quality crystal of pure semimetallic bismuth as a function of magnetic field, from which we extract the conductivity for left- and right-handed circular polarizations. The high spectral resolution allows us to separate the intraband Landau level transitions for electrons and holes. The hole transition exhibits 100% magnetic circular dichroism; it appears only for one polarization as expected for a circular cyclotron orbit. However, the dichroism for electron transitions is reduced to only 13±1%, which is quantitatively explained by the large effective mass anisotropy of the electron pockets of the Fermi surface. This observation is a signature of the mismatch between the metric experienced by the photons and the electrons. It allows for a contactless measurement of the effective mass anisotropy and provides a direction towards valley polarized magnetooptical pumping with elliptically polarized light.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We measure the far-infrared reflectivity and Kerr angle spectra on a high-quality crystal of pure semimetallic bismuth as a function of magnetic field, from which we extract the conductivity for left- and right-handed circular polarizations. The high spectral resolution allows us to separate the intraband Landau level transitions for electrons and holes. The hole transition exhibits 100% magnetic circular dichroism; it appears only for one polarization as expected for a circular cyclotron orbit. However, the dichroism for electron transitions is reduced to only 13±1%, which is quantitatively explained by the large effective mass anisotropy of the electron pockets of the Fermi surface. This observation is a signature of the mismatch between the metric experienced by the photons and the electrons. It allows for a contactless measurement of the effective mass anisotropy and provides a direction towards valley polarized magnetooptical pumping with elliptically polarized light. |
D. van der Marel Quantum-matter physics: Quasiparticles on a collision course Journal Article Nature, 533 , pp. 186–187, 2016, ISSN: ISSN: 0028-0836. @article{vanderMarel2016, title = {Quantum-matter physics: Quasiparticles on a collision course}, author = {D. van der Marel}, editor = {Nature}, url = {http://www.nature.com/nature/journal/v533/n7602/full/533186a.html}, doi = {10.1038/533186a}, issn = {ISSN: 0028-0836}, year = {2016}, date = {2016-05-12}, journal = {Nature}, volume = {533}, pages = {186–187}, abstract = {Emergent quanta of momentum and charge, called quasiparticles, govern many of the properties of materials. The development of a quasiparticle collider promises to reveal fundamental insights into these peculiar entities.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Emergent quanta of momentum and charge, called quasiparticles, govern many of the properties of materials. The development of a quasiparticle collider promises to reveal fundamental insights into these peculiar entities. |
M. Tamagnone; C. Moldovan; J.-M. Poumirol; A. B. Kuzmenko; A. M. Ionescu and J. R. Mosig; J. Perruisseau-Carrier Near optimal graphene terahertz non-reciprocal isolator Journal Article Nature Communications, 7 (11216), 2016. @article{Tamagnone2016, title = {Near optimal graphene terahertz non-reciprocal isolator}, author = {M. Tamagnone and C. Moldovan and J.-M. Poumirol and A. B. Kuzmenko and A. M. Ionescu and J. R. Mosig and J. Perruisseau-Carrier}, editor = {Nature}, url = {http://www.nature.com/ncomms/2016/160406/ncomms11216/abs/ncomms11216.html}, doi = {10.1038/ncomms11216}, year = {2016}, date = {2016-04-06}, journal = {Nature Communications}, volume = {7}, number = {11216}, abstract = {Isolators, or optical diodes, are devices enabling unidirectional light propagation by using non-reciprocal optical materials, namely materials able to break Lorentz reciprocity. The realization of isolators at terahertz frequencies is a very important open challenge made difficult by the intrinsically lossy propagation of terahertz radiation in current non-reciprocal materials. Here we report the design, fabrication and measurement of a terahertz non-reciprocal isolator for circularly polarized waves based on magnetostatically biased monolayer graphene, operating in reflection. The device exploits the non-reciprocal optical conductivity of graphene and, in spite of its simple design, it exhibits almost 20 dB of isolation and only 7.5 dB of insertion loss at 2.9 THz. Operation with linearly polarized light can be achieved using quarter-wave plates as polarization converters. These results demonstrate the superiority of graphene with respect to currently used terahertz non-reciprocal materials and pave the way to a novel class of optimal non-reciprocal devices.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Isolators, or optical diodes, are devices enabling unidirectional light propagation by using non-reciprocal optical materials, namely materials able to break Lorentz reciprocity. The realization of isolators at terahertz frequencies is a very important open challenge made difficult by the intrinsically lossy propagation of terahertz radiation in current non-reciprocal materials. Here we report the design, fabrication and measurement of a terahertz non-reciprocal isolator for circularly polarized waves based on magnetostatically biased monolayer graphene, operating in reflection. The device exploits the non-reciprocal optical conductivity of graphene and, in spite of its simple design, it exhibits almost 20 dB of isolation and only 7.5 dB of insertion loss at 2.9 THz. Operation with linearly polarized light can be achieved using quarter-wave plates as polarization converters. These results demonstrate the superiority of graphene with respect to currently used terahertz non-reciprocal materials and pave the way to a novel class of optimal non-reciprocal devices. |
J. Teyssier; E. Giannini; A. Stucky; R. Černý; M. V. Eremin; D. van der Marel Jahn-Teller induced nematic orbital order in tetragonal Sr2VO4 Journal Article Physical Review B, 93 (125138), 2016. @article{Teyssier2016, title = {Jahn-Teller induced nematic orbital order in tetragonal Sr2VO4}, author = {J. Teyssier and E. Giannini and A. Stucky and R. Černý and M. V. Eremin and D. van der Marel}, editor = {APS}, url = {http://journals.aps.org/prb/pdf/10.1103/PhysRevB.93.125138}, doi = {10.1103/PhysRevB.93.125138}, year = {2016}, date = {2016-03-24}, journal = {Physical Review B}, volume = {93}, number = {125138}, abstract = {Using high resolution x-ray diffraction (XRD) on high purity powders, we resolved the structure and ab symmetry of the intriguing compound Sr2VO4 from room temperature down to 20 K to an unprecedented level of accuracy. Upon cooling, this set of data unambiguously reveals a second-order phase transition lowering the symmetry from tetragonal to orthorhombic at a temperature Tc2=136 K. The observation of an orthorhombic distortion of the ab plane is attributed to nematic phase formation supported by local Jahn-Teller (JT) dynamical instability. At TN=105 K, spins order and at Tc1=100 K the tetragonal structure is recovered with an elongated c axis.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Using high resolution x-ray diffraction (XRD) on high purity powders, we resolved the structure and ab symmetry of the intriguing compound Sr2VO4 from room temperature down to 20 K to an unprecedented level of accuracy. Upon cooling, this set of data unambiguously reveals a second-order phase transition lowering the symmetry from tetragonal to orthorhombic at a temperature Tc2=136 K. The observation of an orthorhombic distortion of the ab plane is attributed to nematic phase formation supported by local Jahn-Teller (JT) dynamical instability. At TN=105 K, spins order and at Tc1=100 K the tetragonal structure is recovered with an elongated c axis. |
C. Barreteau; B. Michon; C. Besnard; E. Giannini High-pressure melt growth and transport properties of SiP, SiAs, GeP, and GeAs 2D layered semiconductors Journal Article Journal of Crystal Growth, 443 , pp. 75-80, 2016. @article{Barreteau2016, title = {High-pressure melt growth and transport properties of SiP, SiAs, GeP, and GeAs 2D layered semiconductors}, author = {C. Barreteau and B. Michon and C. Besnard and E. Giannini}, editor = {Elsevier}, url = {http://www.sciencedirect.com/science/article/pii/S0022024816300914?np=y}, doi = {10.1016/j.jcrysgro.2016.03.019}, year = {2016}, date = {2016-03-07}, journal = {Journal of Crystal Growth}, volume = {443}, pages = {75-80}, abstract = {Silicon and Germanium monopnictides SiP, SiAs, GeP and GeAs form a family of 2D layered semiconductors. We have succeeded in growing bulk single crystals of these compounds by melt-growth under high pressure (0.5-1 GPa) in a cubic anvil hot press. Large (mm-size), shiny, micaceous crystals of GeP, GeAs and SiAs were obtained, and could be exfoliated into 2D flakes. Small and brittle crystals of SiP were yielded by this method. High-pressure sintered polycrystalline SiP and GeAs have also been successfully used as a precursor in the Chemical Vapor Transport growth of these crystals in the presence of I2 as a transport agent. All compounds are found to crystallize in the expected layered structure and do not undergo any structural transition at low temperature, as shown by Raman spectroscopy down to T=5 K. All materials exhibit a semiconducting behavior. The electrical resistivity of GeP, GeAs and SiAs is found to depend on temperature following a 2D-Variable Range Hopping conduction mechanism. The availability of bulk crystals of these compounds opens new perspectives in the field of 2D semiconducting materials for device applications.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Silicon and Germanium monopnictides SiP, SiAs, GeP and GeAs form a family of 2D layered semiconductors. We have succeeded in growing bulk single crystals of these compounds by melt-growth under high pressure (0.5-1 GPa) in a cubic anvil hot press. Large (mm-size), shiny, micaceous crystals of GeP, GeAs and SiAs were obtained, and could be exfoliated into 2D flakes. Small and brittle crystals of SiP were yielded by this method. High-pressure sintered polycrystalline SiP and GeAs have also been successfully used as a precursor in the Chemical Vapor Transport growth of these crystals in the presence of I2 as a transport agent. All compounds are found to crystallize in the expected layered structure and do not undergo any structural transition at low temperature, as shown by Raman spectroscopy down to T=5 K. All materials exhibit a semiconducting behavior. The electrical resistivity of GeP, GeAs and SiAs is found to depend on temperature following a 2D-Variable Range Hopping conduction mechanism. The availability of bulk crystals of these compounds opens new perspectives in the field of 2D semiconducting materials for device applications. |
S. A. Klimin, A. B. Kuzmenko, M. A. Kashchenko,; M. N. Popova Infrared study of lattice dynamics and spin-phonon and electron-phonon interactions in multiferroic TbFe3(BO3)4 and GdFe3(BO3)4 Journal Article http://journals.aps.org/prb/abstract/10.1103/PhysRevB.93.054304, 93 (054304), 2016. @article{Klimin2016, title = {Infrared study of lattice dynamics and spin-phonon and electron-phonon interactions in multiferroic TbFe3(BO3)4 and GdFe3(BO3)4}, author = {S. A. Klimin, A. B. Kuzmenko, M. A. Kashchenko, and M. N. Popova}, url = {http://journals.aps.org/prb/abstract/10.1103/PhysRevB.93.054304}, doi = {http://dx.doi.org/10.1103/PhysRevB.93.054304}, year = {2016}, date = {2016-02-23}, journal = {http://journals.aps.org/prb/abstract/10.1103/PhysRevB.93.054304}, volume = {93}, number = {054304}, abstract = {We present a comparative far-infrared reflection spectroscopy study of phonons, phase transitions, spin-phonon, and electron-phonon interactions in isostructural multiferroic iron borates of gadolinium and terbium. The behavior of phonon modes registered in a wide temperature range is consistent with a weak first-order structural phase transition [Ts=143 for GdFe3(BO3)4 and 200 K for TbFe3(BO3)4] from a high-symmetry high-temperature R32 structure into a low-symmetry low-temperature P3121 one. The temperature dependences of frequencies, oscillator strengths, and damping constants of some low-frequency modes reveal an appreciable lattice anharmonicity. Peculiarities in the phonon mode behavior in both compounds at the temperature of an antiferromagnetic ordering [TN=32K for GdFe3(BO3)4 and 40 K for TbFe3(BO3)4] evidence the spin-phonon interaction. In the energy range of phonons, GdFe3(BO3)4 has no electronic levels, but TbFe3(BO3)4 possesses several. We observe an onset of new bands in the excitation spectrum of TbFe3(BO3)4 due to a resonance interaction between a lattice phonon and 4f electronic crystal-field (CF) excitations of Tb3+. This interaction causes delocalization of the CF excitations, their Davydov splitting, and formation of coupled electron-phonon modes.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We present a comparative far-infrared reflection spectroscopy study of phonons, phase transitions, spin-phonon, and electron-phonon interactions in isostructural multiferroic iron borates of gadolinium and terbium. The behavior of phonon modes registered in a wide temperature range is consistent with a weak first-order structural phase transition [Ts=143 for GdFe3(BO3)4 and 200 K for TbFe3(BO3)4] from a high-symmetry high-temperature R32 structure into a low-symmetry low-temperature P3121 one. The temperature dependences of frequencies, oscillator strengths, and damping constants of some low-frequency modes reveal an appreciable lattice anharmonicity. Peculiarities in the phonon mode behavior in both compounds at the temperature of an antiferromagnetic ordering [TN=32K for GdFe3(BO3)4 and 40 K for TbFe3(BO3)4] evidence the spin-phonon interaction. In the energy range of phonons, GdFe3(BO3)4 has no electronic levels, but TbFe3(BO3)4 possesses several. We observe an onset of new bands in the excitation spectrum of TbFe3(BO3)4 due to a resonance interaction between a lattice phonon and 4f electronic crystal-field (CF) excitations of Tb3+. This interaction causes delocalization of the CF excitations, their Davydov splitting, and formation of coupled electron-phonon modes. |
D. Valentinis; D. van der Marel; C. Berthod BCS superconductivity near the band edge: exact results for one and several bands Journal Article Physical Review B, 94 (2), pp. 024511, 2016. @article{Valentinis2016, title = {BCS superconductivity near the band edge: exact results for one and several bands}, author = {D. Valentinis and D. van der Marel and C. Berthod}, editor = {APS}, url = {http://journals.aps.org/prb/abstract/10.1103/PhysRevB.94.024511}, doi = {http://dx.doi.org/10.1103/PhysRevB.94.024511}, year = {2016}, date = {2016-01-18}, journal = {Physical Review B}, volume = {94}, number = {2}, pages = {024511}, abstract = {We revisit the problem of a BCS superconductor in the regime where the Fermi energy is smaller than the Debye energy. This regime is relevant for low-density superconductors such as SrTiO3 that are not in the BEC limit, as well as in the problem of "shape resonances" associated with the confinement of a three-dimensional superconductor. While the problem is not new, exact results were lacking in the low-density limit. In two dimensions, we find that the initial rise of the pairing temperature Tc at low density n is nonanalytic and faster than any power of n. In three dimensions, we also find that Tc is nonanalytic, but starts with zero slope at weak coupling and infinite slope at strong coupling. Self-consistent treatment of the chemical potential and energy dependence of the density of states are crucial ingredients to obtain these results. We also present exact results for multi-band systems and confirm our analytical expressions by numerical simulations.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We revisit the problem of a BCS superconductor in the regime where the Fermi energy is smaller than the Debye energy. This regime is relevant for low-density superconductors such as SrTiO3 that are not in the BEC limit, as well as in the problem of "shape resonances" associated with the confinement of a three-dimensional superconductor. While the problem is not new, exact results were lacking in the low-density limit. In two dimensions, we find that the initial rise of the pairing temperature Tc at low density n is nonanalytic and faster than any power of n. In three dimensions, we also find that Tc is nonanalytic, but starts with zero slope at weak coupling and infinite slope at strong coupling. Self-consistent treatment of the chemical potential and energy dependence of the density of states are crucial ingredients to obtain these results. We also present exact results for multi-band systems and confirm our analytical expressions by numerical simulations. |
Damien Stricker The nature of Fermi-liquids, an optical perspective PhD Thesis 2015. @phdthesis{Stricker2015, title = {The nature of Fermi-liquids, an optical perspective}, author = {Damien Stricker}, year = {2015}, date = {2015-12-09}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
L. Wang; I. Gutiérrez-Lezama; C. Barreteau; N. Ubrig; E. Giannini; A. F. Morpurgo Tuning magnetotransport in a compensated semimetal at the atomic scale Journal Article Nature Communications, 6 (8892), 2015. @article{Wang2015, title = {Tuning magnetotransport in a compensated semimetal at the atomic scale}, author = {L. Wang and I. Gutiérrez-Lezama and C. Barreteau and N. Ubrig and E. Giannini and A. F. Morpurgo}, editor = {Nature}, url = {http://www.nature.com/ncomms/2015/151124/ncomms9892/full/ncomms9892.html}, doi = {10.1038/ncomms9892}, year = {2015}, date = {2015-11-24}, journal = {Nature Communications}, volume = {6}, number = {8892}, abstract = {Either in bulk form, or in atomically thin crystals, layered transition metal dichalcogenides continuously reveal new phenomena. The latest example is 1T’-WTe2, a semimetal found to exhibit the largest known magnetoresistance in the bulk, and predicted to become a topological insulator in strained monolayers. Here we show that reducing the thickness through exfoliation enables the electronic properties of WTe2 to be tuned, which allows us to identify the mechanisms responsible for the observed magnetotransport down to the atomic scale. The longitudinal resistance and the unconventional magnetic field dependence of the Hall resistance are reproduced quantitatively by a classical two-band model for crystals as thin as six monolayers, whereas a crossover to an Anderson insulator occurs for thinner crystals. Besides establishing the origin of the magnetoresistance of WTe2, our results represent a complete validation of the classical theory for two-band electron-hole transport, and indicate that atomically thin WTe2 layers remain gapless semimetals.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Either in bulk form, or in atomically thin crystals, layered transition metal dichalcogenides continuously reveal new phenomena. The latest example is 1T’-WTe2, a semimetal found to exhibit the largest known magnetoresistance in the bulk, and predicted to become a topological insulator in strained monolayers. Here we show that reducing the thickness through exfoliation enables the electronic properties of WTe2 to be tuned, which allows us to identify the mechanisms responsible for the observed magnetotransport down to the atomic scale. The longitudinal resistance and the unconventional magnetic field dependence of the Hall resistance are reproduced quantitatively by a classical two-band model for crystals as thin as six monolayers, whereas a crossover to an Anderson insulator occurs for thinner crystals. Besides establishing the origin of the magnetoresistance of WTe2, our results represent a complete validation of the classical theory for two-band electron-hole transport, and indicate that atomically thin WTe2 layers remain gapless semimetals. |
J. Ruppen, J. Teyssier, O. E. Peil, S. Catalano, M. Gibert, J. Mravlje, J.-M. Triscone, A. Georges,; D. van der Marel Optical spectroscopy and the nature of the insulating state of rare-earth nickelates Journal Article Physical Review B, 92 (155145), 2015. @article{Ruppen2015, title = {Optical spectroscopy and the nature of the insulating state of rare-earth nickelates}, author = {J. Ruppen, J. Teyssier, O. E. Peil, S. Catalano, M. Gibert, J. Mravlje, J.-M. Triscone, A. Georges, and D. van der Marel}, url = {http://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.155145}, doi = {http://dx.doi.org/10.1103/PhysRevB.92.155145}, year = {2015}, date = {2015-10-27}, journal = {Physical Review B}, volume = {92}, number = {155145}, abstract = {Using a combination of spectroscopic ellipsometry and DC transport measurements, we determine the temperature dependence of the optical conductivity of NdNiO3 and SmNiO3 films. The optical spectra show the appearance of a characteristic two-peak structure in the near-infrared when the material passes from the metal to the insulator phase. Dynamical mean-field theory calculations confirm this two-peak structure and allow us to identify these spectral changes and the associated changes in the electronic structure. We demonstrate that the insulating phase in these compounds and the associated characteristic two-peak structure are due to the combined effect of bond disproportionation and Mott physics associated with half of the disproportionated sites. We also provide insights into the structure of excited states above the gap.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Using a combination of spectroscopic ellipsometry and DC transport measurements, we determine the temperature dependence of the optical conductivity of NdNiO3 and SmNiO3 films. The optical spectra show the appearance of a characteristic two-peak structure in the near-infrared when the material passes from the metal to the insulator phase. Dynamical mean-field theory calculations confirm this two-peak structure and allow us to identify these spectral changes and the associated changes in the electronic structure. We demonstrate that the insulating phase in these compounds and the associated characteristic two-peak structure are due to the combined effect of bond disproportionation and Mott physics associated with half of the disproportionated sites. We also provide insights into the structure of excited states above the gap. |
Michaël K. Tran; Julien Levallois; Ana Akrap; Jérémie Teyssier; Alexey B. Kuzmenko; Florence Levy-Bertrand; Riccardo Tediosi; Mehdi P. Brandt; Philippe Lerch; Dirk van Der Marel Versatile setup for optical spectroscopy under high pressure and low temperature Journal Article Review of Scientific Instruments, 86 (105102), 2015. @article{Tran2015, title = {Versatile setup for optical spectroscopy under high pressure and low temperature}, author = {Michaël K. Tran and Julien Levallois and Ana Akrap and Jérémie Teyssier and Alexey B. Kuzmenko and Florence Levy-Bertrand and Riccardo Tediosi and Mehdi P. Brandt and Philippe Lerch and Dirk van Der Marel}, editor = {Review of Scientific Instruments}, url = {http://dx.doi.org/10.1063/1.4931990 http://archive-ouverte.unige.ch/unige:75744}, year = {2015}, date = {2015-10-01}, journal = {Review of Scientific Instruments}, volume = {86}, number = {105102}, abstract = {We present an optical setup for spectroscopic measurements in the infrared and of Raman shift under high pressure and at low temperature. Using a membrane-driven diamond anvil cell, the pressure can be tuned in situ up to 20 GPa and the temperatures ranges from room temperature down to 18 K in transmission mode and 13 K in reflection mode. In transmission, the setup is entirely working under vacuum to reduce the water absorption features and obtain a higher spectral stability. Since the infrared throughput obtained with a thermal source is limited, the use of a synchrotron source allowed to enhance the performance, as illustrated with results obtained with various materials. The analysis of the reflectivity is adapted so that it benefits from ambient pressure data and produces quantitative optical conductivity curves that can be easily compared to the results at ambient pressure.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We present an optical setup for spectroscopic measurements in the infrared and of Raman shift under high pressure and at low temperature. Using a membrane-driven diamond anvil cell, the pressure can be tuned in situ up to 20 GPa and the temperatures ranges from room temperature down to 18 K in transmission mode and 13 K in reflection mode. In transmission, the setup is entirely working under vacuum to reduce the water absorption features and obtain a higher spectral stability. Since the infrared throughput obtained with a thermal source is limited, the use of a synchrotron source allowed to enhance the performance, as illustrated with results obtained with various materials. The analysis of the reflectivity is adapted so that it benefits from ambient pressure data and produces quantitative optical conductivity curves that can be easily compared to the results at ambient pressure. |
D. Lançon; N. Tsyrulin; M. Böhm; R. Viennois; S. Zabihzadeh; A. Kusmartseva; E. Giannini; H. M. Rønnow Pressure induced evolution of superconductivity and magnetic hourglass dispersion in Fe1.02Te0.7Se0.3 Journal Article New Journal of Physics, 17 (4), pp. 043020, 2015. @article{Lançon2015, title = {Pressure induced evolution of superconductivity and magnetic hourglass dispersion in Fe1.02Te0.7Se0.3}, author = {D. Lançon and N. Tsyrulin and M. Böhm and R. Viennois and S. Zabihzadeh and A. Kusmartseva and E. Giannini and H. M. Rønnow}, url = {http://stacks.iop.org/1367-2630/17/i=4/a=043020}, doi = {10.1088/1367-2630/17/4/043020}, year = {2015}, date = {2015-04-14}, journal = {New Journal of Physics}, volume = {17}, number = {4}, pages = {043020}, abstract = {Iron based high temperature superconductors have several common features with superconducting cuprates, including the square lattice and the proximity to an antiferromagnetic phase. The magnetic excitation spectrum below Tc of Fe1.02Te0.7Se0.3 shows an hourglass-shaped dispersion with a resonance around the commensurate point . In a previous inelastic neutron scattering study, we showed that the hourglass-shaped dispersion is most likely a prerequisite for superconductivity, while the consequences are the opening of a gap and a shift of spectral weight. In this paper we follow the evolution of the hourglass shaped dispersion under applied pressure up to 12 kbar. Our results show that that the pressure-induced 37% increase of Tc is concomitant with a change in the magnetic excitation spectrum, with an increase of the hourglass energy by 38%.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Iron based high temperature superconductors have several common features with superconducting cuprates, including the square lattice and the proximity to an antiferromagnetic phase. The magnetic excitation spectrum below Tc of Fe1.02Te0.7Se0.3 shows an hourglass-shaped dispersion with a resonance around the commensurate point . In a previous inelastic neutron scattering study, we showed that the hourglass-shaped dispersion is most likely a prerequisite for superconductivity, while the consequences are the opening of a gap and a shift of spectral weight. In this paper we follow the evolution of the hourglass shaped dispersion under applied pressure up to 12 kbar. Our results show that that the pressure-induced 37% increase of Tc is concomitant with a change in the magnetic excitation spectrum, with an increase of the hourglass energy by 38%. |
I. Gutierrez Lezama; A. Arora; A. Ubaldini; C. Barreteau; E. Giannini; M. Potemski; A. F. Morpurgo Indirect-to-Direct Band Gap Crossover in Few-Layer MoTe2 Journal Article Nano Letters, 15 (4), pp. 2336–2342, 2015. @article{Lezama2015, title = {Indirect-to-Direct Band Gap Crossover in Few-Layer MoTe2}, author = {I. Gutierrez Lezama and A. Arora and A. Ubaldini and C. Barreteau and E. Giannini and M. Potemski and A. F. Morpurgo}, editor = {ACS}, url = {http://pubs.acs.org/doi/full/10.1021/nl5045007}, doi = {10.1021/nl5045007}, year = {2015}, date = {2015-03-24}, journal = {Nano Letters}, volume = {15}, number = {4}, pages = {2336–2342}, abstract = {We study the evolution of the band gap structure in few-layer MoTe2 crystals, by means of low-temperature microreflectance (MR) and temperature-dependent photoluminescence (PL) measurements. The analysis of the measurements indicate that in complete analogy with other semiconducting transition metal dichalchogenides (TMDs) the dominant PL emission peaks originate from direct transitions associated with recombination of excitons and trions. When we follow the evolution of the PL intensity as a function of layer thickness, however, we observe that MoTe2 behaves differently from other semiconducting TMDs investigated earlier. Specifically, the exciton PL yield (integrated PL intensity) is identical for mono and bilayer, decreases slightly for trilayer, and it is significantly lower in the tetralayer. The analysis of this behavior and of all our experimental observations is fully consistent with mono and bilayer MoTe2 being direct band gap semiconductors with tetralayer MoTe2 being an indirect gap semiconductor and with trilayers having nearly identical direct and indirect gaps. This conclusion is different from the one reached for other recently investigated semiconducting transition metal dichalcogenides for which monolayers are found to be direct band gap semiconductors, and thicker layers have indirect band gaps that are significantly smaller (by hundreds of meV) than the direct gap. We discuss the relevance of our findings for experiments of fundamental interest and possible future device applications.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We study the evolution of the band gap structure in few-layer MoTe2 crystals, by means of low-temperature microreflectance (MR) and temperature-dependent photoluminescence (PL) measurements. The analysis of the measurements indicate that in complete analogy with other semiconducting transition metal dichalchogenides (TMDs) the dominant PL emission peaks originate from direct transitions associated with recombination of excitons and trions. When we follow the evolution of the PL intensity as a function of layer thickness, however, we observe that MoTe2 behaves differently from other semiconducting TMDs investigated earlier. Specifically, the exciton PL yield (integrated PL intensity) is identical for mono and bilayer, decreases slightly for trilayer, and it is significantly lower in the tetralayer. The analysis of this behavior and of all our experimental observations is fully consistent with mono and bilayer MoTe2 being direct band gap semiconductors with tetralayer MoTe2 being an indirect gap semiconductor and with trilayers having nearly identical direct and indirect gaps. This conclusion is different from the one reached for other recently investigated semiconducting transition metal dichalcogenides for which monolayers are found to be direct band gap semiconductors, and thicker layers have indirect band gaps that are significantly smaller (by hundreds of meV) than the direct gap. We discuss the relevance of our findings for experiments of fundamental interest and possible future device applications. |
Julien Levallois, Ievgeniia O. Nedoliuk, Iris Crassee; Alexey B. Kuzmenko Magneto-optical Kramers-Kronig analysis Journal Article Review of Scientific Instruments, 86 (033906), 2015. @article{Levallois2015, title = {Magneto-optical Kramers-Kronig analysis}, author = {Julien Levallois, Ievgeniia O. Nedoliuk, Iris Crassee and Alexey B. Kuzmenko}, url = {http://scitation.aip.org/content/aip/journal/rsi/86/3/10.1063/1.4914846}, year = {2015}, date = {2015-03-17}, journal = {Review of Scientific Instruments}, volume = {86}, number = {033906}, abstract = {We describe a simple magneto-optical experiment and introduce a magneto-optical Kramers-Kronig analysis (MOKKA) that together allow extracting the complex dielectric function for left- and righthanded circular polarizations in a broad range of frequencies without actually generating circularly polarized light. The experiment consists of measuring reflectivity and Kerr rotation, or alternatively transmission and Faraday rotation, at normal incidence using only standard broadband polarizers without retarders or quarter-wave plates. In a common case, where the magneto-optical rotation is small (below ∼0.2 rad), a fast measurement protocol can be realized, where the polarizers are fixed at 45◦ with respect to each other. Apart from the time-effectiveness, the advantage of this protocol is that it can be implemented at ultra-high magnetic fields and in other situations, where an in-situ polarizer rotation is difficult. Overall, the proposed technique can be regarded as a magneto-optical generalization of the conventional Kramers-Kronig analysis of reflectivity on bulk samples and the Kramers-Kronig constrained variational analysis of more complex types of spectral data. We demonstrate the application of this method to the textbook semimetals bismuth and graphite and also use it to obtain handedness-resolved magneto-absorption spectra of graphene on SiC.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We describe a simple magneto-optical experiment and introduce a magneto-optical Kramers-Kronig analysis (MOKKA) that together allow extracting the complex dielectric function for left- and righthanded circular polarizations in a broad range of frequencies without actually generating circularly polarized light. The experiment consists of measuring reflectivity and Kerr rotation, or alternatively transmission and Faraday rotation, at normal incidence using only standard broadband polarizers without retarders or quarter-wave plates. In a common case, where the magneto-optical rotation is small (below ∼0.2 rad), a fast measurement protocol can be realized, where the polarizers are fixed at 45◦ with respect to each other. Apart from the time-effectiveness, the advantage of this protocol is that it can be implemented at ultra-high magnetic fields and in other situations, where an in-situ polarizer rotation is difficult. Overall, the proposed technique can be regarded as a magneto-optical generalization of the conventional Kramers-Kronig analysis of reflectivity on bulk samples and the Kramers-Kronig constrained variational analysis of more complex types of spectral data. We demonstrate the application of this method to the textbook semimetals bismuth and graphite and also use it to obtain handedness-resolved magneto-absorption spectra of graphene on SiC. |
Pascal Schouwink; Adrien Ramel; Enrico Giannini; Radovan Černý Flux-assisted single crystal growth and heteroepitaxy of perovskite-type mixed-metal borohydrides Journal Article CrystEngComm, 17 , pp. 2682-2689, 2015. @article{Schouwink2015, title = {Flux-assisted single crystal growth and heteroepitaxy of perovskite-type mixed-metal borohydrides}, author = {Pascal Schouwink and Adrien Ramel and Enrico Giannini and Radovan Černý}, url = {http://pubs.rsc.org/en/Content/ArticleLanding/2015/CE/C5CE00135H#!divAbstract}, doi = {10.1039/C5CE00135H}, year = {2015}, date = {2015-02-20}, journal = {CrystEngComm}, volume = {17}, pages = {2682-2689}, abstract = {Structural investigations on mixed-metal borohydrides have been the subject of powder diffraction since the discovery that hydrogen-release temperatures can be tailored by using more electronegative metals. The lack of producing suitable samples for single crystal X-ray diffraction has defined powder diffraction as the method of choice which, however, is less sensitive to the structural details of the compounds in question. Here we show how to overcome this limitation by developing a flux-assisted single crystal growth procedure to lower the melting point of mixed-metal compounds that are thermally unstable and usually decompose before melting, or are unstable in the melt. We prove the validity of this principle on a member of the recently reported perovskite-type class of borohydrides and show that the defined approach is easily generalized. Interesting structural details are revealed that stand in contrast to the results obtained from samples produced by mechano-chemistry. The differences in lattice instabilities are discussed and put into context with the discovered epitaxial relationships between rocksalt-type ABH4 and perovskite-type ACa(BH4)3 (A = alkaline metal). In this context, the preliminary results provide a valuable scheme that can be made use of when physical deposition of metal borohydrides reaches its working stage.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Structural investigations on mixed-metal borohydrides have been the subject of powder diffraction since the discovery that hydrogen-release temperatures can be tailored by using more electronegative metals. The lack of producing suitable samples for single crystal X-ray diffraction has defined powder diffraction as the method of choice which, however, is less sensitive to the structural details of the compounds in question. Here we show how to overcome this limitation by developing a flux-assisted single crystal growth procedure to lower the melting point of mixed-metal compounds that are thermally unstable and usually decompose before melting, or are unstable in the melt. We prove the validity of this principle on a member of the recently reported perovskite-type class of borohydrides and show that the defined approach is easily generalized. Interesting structural details are revealed that stand in contrast to the results obtained from samples produced by mechano-chemistry. The differences in lattice instabilities are discussed and put into context with the discovered epitaxial relationships between rocksalt-type ABH4 and perovskite-type ACa(BH4)3 (A = alkaline metal). In this context, the preliminary results provide a valuable scheme that can be made use of when physical deposition of metal borohydrides reaches its working stage. |
Jérémie Teyssier; Suzanne V. Saenko; Dirk van der Marel; Michel C. Milinkovitch Photonic crystals cause active colour change in chameleons Journal Article Nat Commun, 6 , 2015. @article{teyssier_photonic_2015, title = {Photonic crystals cause active colour change in chameleons}, author = {Jérémie Teyssier and Suzanne V. Saenko and Dirk van der Marel and Michel C. Milinkovitch}, url = {http://dx.doi.org/10.1038/ncomms7368}, year = {2015}, date = {2015-01-01}, journal = {Nat Commun}, volume = {6}, abstract = {Many chameleons, and panther chameleons in particular, have the remarkable ability to exhibit complex and rapid colour changes during social interactions such as male contests or courtship. It is generally interpreted that these changes are due to dispersion/aggregation of pigment-containing organelles within dermal chromatophores. Here, combining microscopy, photometric videography and photonic band-gap modelling, we show that chameleons shift colour through active tuning of a lattice of guanine nanocrystals within a superficial thick layer of dermal iridophores. In addition, we show that a deeper population of iridophores with larger crystals reflects a substantial proportion of sunlight especially in the near-infrared range. The organization of iridophores into two superposed layers constitutes an evolutionary novelty for chameleons, which allows some species to combine efficient camouflage with spectacular display, while potentially providing passive thermal protection.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Many chameleons, and panther chameleons in particular, have the remarkable ability to exhibit complex and rapid colour changes during social interactions such as male contests or courtship. It is generally interpreted that these changes are due to dispersion/aggregation of pigment-containing organelles within dermal chromatophores. Here, combining microscopy, photometric videography and photonic band-gap modelling, we show that chameleons shift colour through active tuning of a lattice of guanine nanocrystals within a superficial thick layer of dermal iridophores. In addition, we show that a deeper population of iridophores with larger crystals reflects a substantial proportion of sunlight especially in the near-infrared range. The organization of iridophores into two superposed layers constitutes an evolutionary novelty for chameleons, which allows some species to combine efficient camouflage with spectacular display, while potentially providing passive thermal protection. |
M. Guarise; B. Dalla Piazza; H. Berger; E. Giannini; T. Schmitt; H. M. Rønnow; G. A. Sawatzky; J. van den Brink; D. Altenfeld; I. Eremin; M. Grioni Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates Journal Article Nature Communications, 5 , 2014. @article{guarise_anisotropic_2014, title = {Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates}, author = {M. Guarise and B. Dalla Piazza and H. Berger and E. Giannini and T. Schmitt and H. M. Rønnow and G. A. Sawatzky and J. van den Brink and D. Altenfeld and I. Eremin and M. Grioni}, url = {http://www.nature.com/ncomms/2014/141218/ncomms6760/full/ncomms6760.html}, year = {2014}, date = {2014-12-18}, urldate = {2015-02-19}, journal = {Nature Communications}, volume = {5}, abstract = {The high-Tc cuprate superconductors are close to antiferromagnetic order. Recent measurements of magnetic excitations have reported an intriguing similarity to the spin waves—magnons—of the antiferromagnetic insulating parent compounds, suggesting that magnons may survive in damped, broadened form throughout the phase diagram. Here we show by resonant inelastic X-ray scattering on Bi2Sr2CaCu2O8+δ (Bi-2212) that the analogy with spin waves is only partial. The magnon-like features collapse along the nodal direction in momentum space and exhibit a photon energy dependence markedly different from the Mott-insulating case. These observations can be naturally described by the continuum of charge and spin excitations of correlated electrons. The persistence of damped magnons could favour scenarios for superconductivity built from quasiparticles coupled to spin fluctuations. However, excitation spectra composed of particle–hole excitations suggest that superconductivity emerges from a coherent treatment of electronic spin and charge in the form of quasiparticles with very strong magnetic correlations.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The high-Tc cuprate superconductors are close to antiferromagnetic order. Recent measurements of magnetic excitations have reported an intriguing similarity to the spin waves—magnons—of the antiferromagnetic insulating parent compounds, suggesting that magnons may survive in damped, broadened form throughout the phase diagram. Here we show by resonant inelastic X-ray scattering on Bi2Sr2CaCu2O8+δ (Bi-2212) that the analogy with spin waves is only partial. The magnon-like features collapse along the nodal direction in momentum space and exhibit a photon energy dependence markedly different from the Mott-insulating case. These observations can be naturally described by the continuum of charge and spin excitations of correlated electrons. The persistence of damped magnons could favour scenarios for superconductivity built from quasiparticles coupled to spin fluctuations. However, excitation spectra composed of particle–hole excitations suggest that superconductivity emerges from a coherent treatment of electronic spin and charge in the form of quasiparticles with very strong magnetic correlations. |
Michael Tran Possible phase transitions probed by infrared spectroscopy under high pressure: BiTeI and Li0.9Mo6O17 PhD Thesis 2014. @phdthesis{Tran2014, title = {Possible phase transitions probed by infrared spectroscopy under high pressure: BiTeI and Li0.9Mo6O17}, author = {Michael Tran}, year = {2014}, date = {2014-12-16}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
M. P. M. Dean; A. J. A. James; A. C. Walters; V. Bisogni; I. Jarrige; M. H"ucker; E. Giannini; M. Fujita; J. Pelliciari; Y. B. Huang; R. M. Konik; T. Schmitt; J. P. Hill Itinerant effects and enhanced magnetic interactions in Bi-based multilayer cuprates Journal Article Phys. Rev. B, 90 , pp. 220506, 2014. @article{PhysRevB.90.220506, title = {Itinerant effects and enhanced magnetic interactions in Bi-based multilayer cuprates}, author = {M. P. M. Dean and A. J. A. James and A. C. Walters and V. Bisogni and I. Jarrige and M. H"ucker and E. Giannini and M. Fujita and J. Pelliciari and Y. B. Huang and R. M. Konik and T. Schmitt and J. P. Hill}, url = {http://link.aps.org/doi/10.1103/PhysRevB.90.220506}, year = {2014}, date = {2014-12-04}, journal = {Phys. Rev. B}, volume = {90}, pages = {220506}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A Stucky; A Ubaldini; J Levallois; M K Tran; D van der Marel; E Giannini Shining light on CuO for exploring high-Tc multiferroics Journal Article Journal of Physics: Conference Series, 566 (1), pp. 012012, 2014. @article{1742-6596-566-1-012012, title = {Shining light on CuO for exploring high-Tc multiferroics}, author = {A Stucky and A Ubaldini and J Levallois and M K Tran and D van der Marel and E Giannini}, url = {http://stacks.iop.org/1742-6596/566/i=1/a=012012}, year = {2014}, date = {2014-12-01}, journal = {Journal of Physics: Conference Series}, volume = {566}, number = {1}, pages = {012012}, abstract = {Searching for a 3D multiferroic material with a strong magnetoelectric coupling and high critical temperature is a major challenge in modern condensed matter research. CuO is the building block of high-temperature superconductors and triggered a new interest when it was established as potential high temperature multiferroic. We have succeeded in growing high quality single crystals of CuO with two different methods, namely the floating zone under high oxygen pressure and the chemical vapor transport growth. The fact that we are able to grow crystals of the same compound by different techniques makes it possible to study the effect of slightly different chemical compositions, various kinds of defects and variable strain on the final properties of the compound. Optical spectroscopy has been deployed to study the optical response of cupric oxide. Thereby we achieved a deeper insight of the optical, electronic and structural properties by measuring the infrared reflectivity under a magnetic field and the Raman shift under hydrostatic high pressure.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Searching for a 3D multiferroic material with a strong magnetoelectric coupling and high critical temperature is a major challenge in modern condensed matter research. CuO is the building block of high-temperature superconductors and triggered a new interest when it was established as potential high temperature multiferroic. We have succeeded in growing high quality single crystals of CuO with two different methods, namely the floating zone under high oxygen pressure and the chemical vapor transport growth. The fact that we are able to grow crystals of the same compound by different techniques makes it possible to study the effect of slightly different chemical compositions, various kinds of defects and variable strain on the final properties of the compound. Optical spectroscopy has been deployed to study the optical response of cupric oxide. Thereby we achieved a deeper insight of the optical, electronic and structural properties by measuring the infrared reflectivity under a magnetic field and the Raman shift under hydrostatic high pressure. |
E Cappelluti; L Benfatto; A B Kuzmenko Infrared phonon activity and Fano interference in multilayer graphenes Journal Article Physica Scripta, T162 , pp. 014018, 2014. @article{Cappelluti2014, title = {Infrared phonon activity and Fano interference in multilayer graphenes}, author = {E Cappelluti and L Benfatto and A B Kuzmenko}, doi = {10.1088/0031-8949/2014/t162/014018}, year = {2014}, date = {2014-09-19}, journal = {Physica Scripta}, volume = {T162}, pages = {014018}, abstract = {Recent optical measurements in bilayer graphene have reported a strong dependence on phonon peak intensity, as well on the asymmetric Fano lineshape, on the charge doping and on the bandgap, tuned by gate voltage. In this paper, we show how these features can be analyzed and predicted on a microscopic quantitative level using the charge-phonon theory applied to the specific case of graphene systems. We present a phase diagram where the infrared activity of both the symmetric (Eg) and antisymmetric (Eu) phonon modes is evaluated as a function of doping and gap. We also show how a switching mechanism between these two modes can occur, governing the dominance of the optical response of one mode with respect to the other. The theory presented here can be also generalized to bulk graphite and to multilayer systems with different stacking orders, providing a useful roadmap for the characterization of graphenic systems by optical infrared means.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Recent optical measurements in bilayer graphene have reported a strong dependence on phonon peak intensity, as well on the asymmetric Fano lineshape, on the charge doping and on the bandgap, tuned by gate voltage. In this paper, we show how these features can be analyzed and predicted on a microscopic quantitative level using the charge-phonon theory applied to the specific case of graphene systems. We present a phase diagram where the infrared activity of both the symmetric (Eg) and antisymmetric (Eu) phonon modes is evaluated as a function of doping and gap. We also show how a switching mechanism between these two modes can occur, governing the dominance of the optical response of one mode with respect to the other. The theory presented here can be also generalized to bulk graphite and to multilayer systems with different stacking orders, providing a useful roadmap for the characterization of graphenic systems by optical infrared means. |
Ana Akrap; Alberto Ubaldini; Enrico Giannini; László Forró Bi2Te(3−x)Se(x) series studied by resistivity and thermopower Journal Article EPL (Europhysics Letters), 107 (5), pp. 57008, 2014. @article{0295-5075-107-5-57008, title = {Bi2Te(3−x)Se(x) series studied by resistivity and thermopower}, author = {Ana Akrap and Alberto Ubaldini and Enrico Giannini and László Forró}, url = {http://dx.doi.org/10.1209/0295-5075/107/57008 http://archive-ouverte.unige.ch/unige:40713 http://arxiv.org/abs/1210.3901}, year = {2014}, date = {2014-09-08}, journal = {EPL (Europhysics Letters)}, volume = {107}, number = {5}, pages = {57008}, abstract = {We study the detailed temperature and composition dependence of the resistivity, ##IMG## [http://ej.iop.org/images/0295-5075/107/5/57008/epl16520ieqn1.gif] $rho(T)$ , and thermopower, S ( T ), for a series of layered bismuth chalcogenides Bi 2 Te 3− x Se x , and report the stoichiometry dependence of the optical band gap. In the resistivity of the most compensated member, Bi 2 Te 2.1 Se 0.9 , we find a low-temperature plateau whose onset temperature correlates with the high-temperature activation energy. For the whole series S ( T ) can be described by a simple model for an extrinsic semiconductor. By substituting Se for Te, the Fermi level is tuned from the valence band into the conduction band. The maximum values of S ( T ), bulk band gap as well the activation energy in the resistivity are found for ##IMG## [http://ej.iop.org/images/0295-5075/107/5/57008/epl16520ieqn2.gif] $x approx 0.9$ .}, keywords = {}, pubstate = {published}, tppubtype = {article} } We study the detailed temperature and composition dependence of the resistivity, ##IMG## [http://ej.iop.org/images/0295-5075/107/5/57008/epl16520ieqn1.gif] $rho(T)$ , and thermopower, S ( T ), for a series of layered bismuth chalcogenides Bi 2 Te 3− x Se x , and report the stoichiometry dependence of the optical band gap. In the resistivity of the most compensated member, Bi 2 Te 2.1 Se 0.9 , we find a low-temperature plateau whose onset temperature correlates with the high-temperature activation energy. For the whole series S ( T ) can be described by a simple model for an extrinsic semiconductor. By substituting Se for Te, the Fermi level is tuned from the valence band into the conduction band. The maximum values of S ( T ), bulk band gap as well the activation energy in the resistivity are found for ##IMG## [http://ej.iop.org/images/0295-5075/107/5/57008/epl16520ieqn2.gif] $x approx 0.9$ . |
D. Stricker; J. Mravlje; C. Berthod; R. Fittipaldi; A. Vecchione; A. Georges; D. van der Marel Optical Response of Sr2RuO4 Reveals Universal Fermi-Liquid Scaling and Quasiparticles Beyond Landau Theory Journal Article Phys. Rev. Lett., 113 , pp. 087404, 2014. @article{PhysRevLett.113.087404, title = {Optical Response of Sr2RuO4 Reveals Universal Fermi-Liquid Scaling and Quasiparticles Beyond Landau Theory}, author = {D. Stricker and J. Mravlje and C. Berthod and R. Fittipaldi and A. Vecchione and A. Georges and D. van der Marel}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.113.087404 http://archive-ouverte.unige.ch/unige:39703 http://arxiv.org/abs/1403.5445}, year = {2014}, date = {2014-08-22}, journal = {Phys. Rev. Lett.}, volume = {113}, pages = {087404}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ignacio Gutiérrez Lezama; Alberto Ubaldini; Maria Longobardi; Enrico Giannini; Christoph Renner; Alexey B Kuzmenko; Alberto F Morpurgo Surface transport and band gap structure of exfoliated 2H-MoTe2 crystals Journal Article 2D Materials, 1 (2), pp. 021002, 2014. @article{2053-1583-1-2-021002, title = {Surface transport and band gap structure of exfoliated 2H-MoTe2 crystals}, author = {Ignacio Gutiérrez Lezama and Alberto Ubaldini and Maria Longobardi and Enrico Giannini and Christoph Renner and Alexey B Kuzmenko and Alberto F Morpurgo}, url = {http://stacks.iop.org/2053-1583/1/i=2/a=021002 http://arxiv.org/abs/1407.1219}, year = {2014}, date = {2014-08-06}, journal = {2D Materials}, volume = {1}, number = {2}, pages = {021002}, abstract = {Semiconducting transition metal dichalcogenides (TMDs) have emerged as materials that can be used to realize two-dimensional (2D) crystals possessing rather unique transport and optical properties. Most research has so far focused on sulfur and selenium compounds, while tellurium-based materials have attracted little attention so far. As a first step in the investigation of Te-based semiconducting TMDs in this context, we have studied MoTe 2 crystals with thicknesses above 4 nm, focusing on surface transport and a quantitative determination of the gap structure. Using ionic-liquid gated transistors, we show that ambipolar transport at the surface of the material is reproducibly achieved, with hole and electron mobility values between 10 and 30 cm 2 V −1 s −1 at room temperature. The gap structure is determined through three different techniques: ionic-liquid gated transistors and scanning tunneling spectroscopy, which allow the measurement of the indirect gap ( E ind ), and optical transmission spectroscopy on crystals of different thickness, which enables the determination of both the direct ( E dir ) and the indirect gap. We find that at room temperature E ind = 0.88 eV and E dir = 1.02 eV. Our results suggest that thin MoTe 2 layers may exhibit a transition to a direct gap before mono-layer thickness. They should also drastically extend the range of direct gaps accessible in 2D semiconducting TMDs.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Semiconducting transition metal dichalcogenides (TMDs) have emerged as materials that can be used to realize two-dimensional (2D) crystals possessing rather unique transport and optical properties. Most research has so far focused on sulfur and selenium compounds, while tellurium-based materials have attracted little attention so far. As a first step in the investigation of Te-based semiconducting TMDs in this context, we have studied MoTe 2 crystals with thicknesses above 4 nm, focusing on surface transport and a quantitative determination of the gap structure. Using ionic-liquid gated transistors, we show that ambipolar transport at the surface of the material is reproducibly achieved, with hole and electron mobility values between 10 and 30 cm 2 V −1 s −1 at room temperature. The gap structure is determined through three different techniques: ionic-liquid gated transistors and scanning tunneling spectroscopy, which allow the measurement of the indirect gap ( E ind ), and optical transmission spectroscopy on crystals of different thickness, which enables the determination of both the direct ( E dir ) and the indirect gap. We find that at room temperature E ind = 0.88 eV and E dir = 1.02 eV. Our results suggest that thin MoTe 2 layers may exhibit a transition to a direct gap before mono-layer thickness. They should also drastically extend the range of direct gaps accessible in 2D semiconducting TMDs. |
Davide Forcella; Jan Zaanen; Davide Valentinis; Dirk van der Marel Electromagnetic properties of viscous charged fluids Journal Article Phys. Rev. B, 90 , pp. 035143, 2014. @article{PhysRevB.90.035143, title = {Electromagnetic properties of viscous charged fluids}, author = {Davide Forcella and Jan Zaanen and Davide Valentinis and Dirk van der Marel}, url = {http://link.aps.org/doi/10.1103/PhysRevB.90.035143 http://archive-ouverte.unige.ch/unige:39150 http://arxiv.org/abs/1406.1356}, year = {2014}, date = {2014-07-30}, journal = {Phys. Rev. B}, volume = {90}, pages = {035143}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Dirk van der Marel; George Albert Sawatzky An optical twist for triplet superconductors Journal Article Science, 345 (6193), pp. 138-139, 2014. @article{vanderMarel11072014, title = {An optical twist for triplet superconductors}, author = {Dirk van der Marel and George Albert Sawatzky}, url = {http://www.sciencemag.org/content/345/6193/138.short}, year = {2014}, date = {2014-07-11}, journal = {Science}, volume = {345}, number = {6193}, pages = {138-139}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
F. Cilento; S. Dal Conte; G. Coslovich; S. Peli; N. Nembrini; S. Mor; F. Banfi; G. Ferrini; H. Eisaki; M. K. Chan; C. J. Dorow; M. J. Veit; M. Greven; D. van der Marel; R. Comin; A. Damascelli; L. Rettig; U. Bovensiepen; M. Capone; C. Giannetti; F. Parmigiani Photo-enhanced antinodal conductivity in the pseudogap state of high-Tc cuprates Journal Article Nat Commun, 5 , pp. 4353, 2014. @article{cilento_photo-enhanced_2014, title = {Photo-enhanced antinodal conductivity in the pseudogap state of high-Tc cuprates}, author = {F. Cilento and S. Dal Conte and G. Coslovich and S. Peli and N. Nembrini and S. Mor and F. Banfi and G. Ferrini and H. Eisaki and M. K. Chan and C. J. Dorow and M. J. Veit and M. Greven and D. van der Marel and R. Comin and A. Damascelli and L. Rettig and U. Bovensiepen and M. Capone and C. Giannetti and F. Parmigiani}, url = {http://dx.doi.org/10.1038/ncomms5353 http://arxiv.org/abs/1405.5462}, year = {2014}, date = {2014-07-11}, journal = {Nat Commun}, volume = {5}, pages = {4353}, abstract = {A major challenge in understanding the cuprate superconductors is to clarify the nature of the fundamental electronic correlations that lead to the pseudogap phenomenon. Here we use ultrashort light pulses to prepare a non-thermal distribution of excitations and capture novel properties that are hidden at equilibrium. Using a broadband (0.5–2 eV) probe, we are able to track the dynamics of the dielectric function and unveil an anomalous decrease in the scattering rate of the charge carriers in a pseudogap-like region of the temperature (T) and hole-doping (p) phase diagram. In this region, delimited by a well-defined T*neq(p) line, the photoexcitation process triggers the evolution of antinodal excitations from gapped (localized) to delocalized quasiparticles characterized by a longer lifetime. The novel concept of photo-enhanced antinodal conductivity is naturally explained within the single-band Hubbard model, in which the short-range Coulomb repulsion leads to a k-space differentiation between nodal quasiparticles and antinodal excitations.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A major challenge in understanding the cuprate superconductors is to clarify the nature of the fundamental electronic correlations that lead to the pseudogap phenomenon. Here we use ultrashort light pulses to prepare a non-thermal distribution of excitations and capture novel properties that are hidden at equilibrium. Using a broadband (0.5–2 eV) probe, we are able to track the dynamics of the dielectric function and unveil an anomalous decrease in the scattering rate of the charge carriers in a pseudogap-like region of the temperature (T) and hole-doping (p) phase diagram. In this region, delimited by a well-defined T*neq(p) line, the photoexcitation process triggers the evolution of antinodal excitations from gapped (localized) to delocalized quasiparticles characterized by a longer lifetime. The novel concept of photo-enhanced antinodal conductivity is naturally explained within the single-band Hubbard model, in which the short-range Coulomb repulsion leads to a k-space differentiation between nodal quasiparticles and antinodal excitations. |
Ana Akrap; Jérémie Teyssier; Arnaud Magrez; Philippe Bugnon; Helmuth Berger; Alexey B. Kuzmenko; Dirk van der Marel Optical properties of BiTeBr and BiTeCl Journal Article Phys. Rev. B, 90 , pp. 035201, 2014. @article{PhysRevB.90.035201, title = {Optical properties of BiTeBr and BiTeCl}, author = {Ana Akrap and Jérémie Teyssier and Arnaud Magrez and Philippe Bugnon and Helmuth Berger and Alexey B. Kuzmenko and Dirk van der Marel}, url = {http://link.aps.org/doi/10.1103/PhysRevB.90.035201 http://archive-ouverte.unige.ch/unige:38561 http://arxiv.org/abs/1406.5356}, year = {2014}, date = {2014-07-02}, journal = {Phys. Rev. B}, volume = {90}, pages = {035201}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
S. N. Klimin; J. Tempere; J. T. Devreese; D. van der Marel Interface superconductivity in LaAlO3-SrTiO3 heterostructures Journal Article Phys. Rev. B, 89 , pp. 184514, 2014. @article{PhysRevB.89.184514, title = {Interface superconductivity in LaAlO3-SrTiO3 heterostructures}, author = {S. N. Klimin and J. Tempere and J. T. Devreese and D. van der Marel}, url = {http://link.aps.org/doi/10.1103/PhysRevB.89.184514 http://arxiv.org/abs/1402.6227 http://optics.unige.ch/vdm/marel_files/publications/klimin2014.pdf}, year = {2014}, date = {2014-05-30}, journal = {Phys. Rev. B}, volume = {89}, pages = {184514}, publisher = {American Physical Society}, abstract = {The interface superconductivity in LaAlO3-SrTiO3 heterostructures reveals a nonmonotonic behavior of the critical temperature as a function of the two-dimensional density of charge carriers. We develop a theoretical description of interface superconductivity in strongly polar heterostructures, based on the dielectric function formalism. The density dependence of the critical temperature is calculated, accounting for all phonon branches including different types of optical (interface and half-space) and acoustic phonons. The longitudinal-optic- and acoustic-phonon mediated electron-electron interaction is shown to be the dominating mechanism governing the superconducting phase transition in the heterostructure.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The interface superconductivity in LaAlO3-SrTiO3 heterostructures reveals a nonmonotonic behavior of the critical temperature as a function of the two-dimensional density of charge carriers. We develop a theoretical description of interface superconductivity in strongly polar heterostructures, based on the dielectric function formalism. The density dependence of the critical temperature is calculated, accounting for all phonon branches including different types of optical (interface and half-space) and acoustic phonons. The longitudinal-optic- and acoustic-phonon mediated electron-electron interaction is shown to be the dominating mechanism governing the superconducting phase transition in the heterostructure. |
Nicolas Ubrig; Sanghyun Jo; Helmuth Berger; Alberto F. Morpurgo; Alexey B. Kuzmenko Scanning photocurrent microscopy reveals electron-hole asymmetry in ionic liquid-gated WS2 transistors Journal Article Applied Physics Letters, 104 (17), pp. 171112, 2014. @article{ubrigAPL2014, title = {Scanning photocurrent microscopy reveals electron-hole asymmetry in ionic liquid-gated WS2 transistors}, author = {Nicolas Ubrig and Sanghyun Jo and Helmuth Berger and Alberto F. Morpurgo and Alexey B. Kuzmenko}, url = {http://scitation.aip.org/content/aip/journal/apl/104/17/10.1063/1.4872002 http://arxiv.org/abs/1404.7691 http://archive-ouverte.unige.ch/unige:36286}, year = {2014}, date = {2014-04-30}, journal = {Applied Physics Letters}, volume = {104}, number = {17}, pages = {171112}, abstract = {We perform scanning photocurrent microscopy on WS2 ionic liquid-gated field effect transistors exhibiting high-quality ambipolar transport. By properly biasing the gate electrode, we can invert the sign of the photocurrent showing that the minority photocarriers are either electrons or holes. Both in the electron- and hole-doping regimes the photocurrent decays exponentially as a function of the distance between the illumination spot and the nearest contact, in agreement with a two-terminal Schottky-barrier device model. This allows us to compare the value and the doping dependence of the diffusion length of the minority electrons and holes on a same sample. Interestingly, the diffusion length of the minority carriers is several times larger in the hole accumulation regime than in the electron accumulation regime, pointing out an electron-hole asymmetry in WS2.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We perform scanning photocurrent microscopy on WS2 ionic liquid-gated field effect transistors exhibiting high-quality ambipolar transport. By properly biasing the gate electrode, we can invert the sign of the photocurrent showing that the minority photocarriers are either electrons or holes. Both in the electron- and hole-doping regimes the photocurrent decays exponentially as a function of the distance between the illumination spot and the nearest contact, in agreement with a two-terminal Schottky-barrier device model. This allows us to compare the value and the doping dependence of the diffusion length of the minority electrons and holes on a same sample. Interestingly, the diffusion length of the minority carriers is several times larger in the hole accumulation regime than in the electron accumulation regime, pointing out an electron-hole asymmetry in WS2. |
Julien Levallois; Piotr Chudziński; Jason N. Hancock; Alexey B. Kuzmenko; Dirk van der Marel Magnetoplasmon resonances in polycrystalline bismuth as seen via time-domain terahertz spectroscopy Journal Article Phys. Rev. B, 89 , pp. 155123, 2014. @article{PhysRevB.89.155123, title = {Magnetoplasmon resonances in polycrystalline bismuth as seen via time-domain terahertz spectroscopy}, author = {Julien Levallois and Piotr Chudziński and Jason N. Hancock and Alexey B. Kuzmenko and Dirk van der Marel}, url = {http://link.aps.org/doi/10.1103/PhysRevB.89.155123 http://arxiv.org/abs/1403.7895 http://archive-ouverte.unige.ch/unige:35898}, year = {2014}, date = {2014-04-17}, journal = {Phys. Rev. B}, volume = {89}, pages = {155123}, publisher = {American Physical Society}, abstract = {We report the magnetic-field-dependent far-infrared reflectivity of polycrystalline bismuth. We observe four distinct absorptions that we attribute to magnetoplasmon resonances, which are collective modes of an electron-hole liquid in a magnetic field and become optical and acoustic resonances of the electron-hole system in the small-field limit. Acoustic mode are only when the masses of distinct components are very different, which is the case in bismuth. In a polycrystal, where the translational symmetry is broken, a big shift of spectral weight to an acoustic plasmon is possible. This enables us to detect an associated plasma edge. Although the polycrystal sample has grains of randomly distributed orientations, our reflectivity results can be explained by invoking only two, clearly distinct, series of resonances. In the limit of zero field, the optical modes of these two series converge onto plasma frequencies measured in a monocrystal along the main optical axes.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We report the magnetic-field-dependent far-infrared reflectivity of polycrystalline bismuth. We observe four distinct absorptions that we attribute to magnetoplasmon resonances, which are collective modes of an electron-hole liquid in a magnetic field and become optical and acoustic resonances of the electron-hole system in the small-field limit. Acoustic mode are only when the masses of distinct components are very different, which is the case in bismuth. In a polycrystal, where the translational symmetry is broken, a big shift of spectral weight to an acoustic plasmon is possible. This enables us to detect an associated plasma edge. Although the polycrystal sample has grains of randomly distributed orientations, our reflectivity results can be explained by invoking only two, clearly distinct, series of resonances. In the limit of zero field, the optical modes of these two series converge onto plasma frequencies measured in a monocrystal along the main optical axes. |
Andrei G. Stepanov; Clemens Ruchert; Julien Levallois; Christian Erny; Christoph P. Hauri Generation of broadband THz pulses in organic crystal OH1 at room temperature and 10 K Journal Article Opt. Mater. Express, 4 (4), pp. 870–875, 2014. @article{Stepanov:14, title = {Generation of broadband THz pulses in organic crystal OH1 at room temperature and 10 K}, author = {Andrei G. Stepanov and Clemens Ruchert and Julien Levallois and Christian Erny and Christoph P. Hauri}, url = {http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-4-4-870 http://arxiv.org/abs/1402.5294 http://archive-ouverte.unige.ch/unige:36307}, year = {2014}, date = {2014-03-31}, journal = {Opt. Mater. Express}, volume = {4}, number = {4}, pages = {870--875}, publisher = {OSA}, abstract = {We studied the effects of cryogenic cooling of a 2-[3-(4-hydroxystyryl)-5, 5-dimethylcyclohex-2-enylidene] malononitrile (OH1) crystal on the generation of broadband THz pulses via collinear optical rectification of 1350 nm femtosecond laser pulses. Cooling of the OH1 crystal from room temperature to 10 K leads to a ~10% increase of the pump-to-THz energy conversion efficiency and a shift of the THz pulse spectra to a higher frequency range. Both effects are due to the temperature variation of the THz absorption and the refractive index of the OH1 crystal. This conclusion has been verified by temperature dependent measurements of the linear absorption in the THz frequency region. An approach to obtain a stronger increase of the THz generation efficiency at cryogenic cooling of the OH1 crystal is discussed.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We studied the effects of cryogenic cooling of a 2-[3-(4-hydroxystyryl)-5, 5-dimethylcyclohex-2-enylidene] malononitrile (OH1) crystal on the generation of broadband THz pulses via collinear optical rectification of 1350 nm femtosecond laser pulses. Cooling of the OH1 crystal from room temperature to 10 K leads to a ~10% increase of the pump-to-THz energy conversion efficiency and a shift of the THz pulse spectra to a higher frequency range. Both effects are due to the temperature variation of the THz absorption and the refractive index of the OH1 crystal. This conclusion has been verified by temperature dependent measurements of the linear absorption in the THz frequency region. An approach to obtain a stronger increase of the THz generation efficiency at cryogenic cooling of the OH1 crystal is discussed. |
Sanghyun Jo; Nicolas Ubrig; Helmuth Berger; Alexey B. Kuzmenko; Alberto F. Morpurgo Mono- and Bilayer WS2 Light-Emitting Transistors Journal Article Nano Letters, 14 (4), pp. 2019-2025, 2014. @article{doi:10.1021/nl500171v, title = {Mono- and Bilayer WS2 Light-Emitting Transistors}, author = {Sanghyun Jo and Nicolas Ubrig and Helmuth Berger and Alexey B. Kuzmenko and Alberto F. Morpurgo}, url = {http://pubs.acs.org/doi/abs/10.1021/nl500171v http://arxiv.org/abs/1403.7551}, year = {2014}, date = {2014-03-26}, journal = {Nano Letters}, volume = {14}, number = {4}, pages = {2019-2025}, abstract = {We have realized ambipolar ionic liquid gated field-effect transistors based on WS2 mono- and bilayers, and investigated their opto-electronic response. A thorough characterization of the transport properties demonstrates the high quality of these devices for both electron and hole accumulation, which enables the quantitative determination of the band gap (Δ1L = 2.14 eV for monolayers and Δ2L = 1.82 eV for bilayers). It also enables the operation of the transistors in the ambipolar injection regime with electrons and holes injected simultaneously at the two opposite contacts of the devices in which we observe light emission from the FET channel. A quantitative analysis of the spectral properties of the emitted light, together with a comparison with the band gap values obtained from transport, show the internal consistency of our results and allow a quantitative estimate of the excitonic binding energies to be made. Our results demonstrate the power of ionic liquid gating in combination with nanoelectronic systems, as well as the compatibility of this technique with optical measurements on semiconducting transition metal dichalcogenides. These findings further open the way to the investigation of the optical properties of these systems in a carrier density range much broader than that explored until now.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We have realized ambipolar ionic liquid gated field-effect transistors based on WS2 mono- and bilayers, and investigated their opto-electronic response. A thorough characterization of the transport properties demonstrates the high quality of these devices for both electron and hole accumulation, which enables the quantitative determination of the band gap (Δ1L = 2.14 eV for monolayers and Δ2L = 1.82 eV for bilayers). It also enables the operation of the transistors in the ambipolar injection regime with electrons and holes injected simultaneously at the two opposite contacts of the devices in which we observe light emission from the FET channel. A quantitative analysis of the spectral properties of the emitted light, together with a comparison with the band gap values obtained from transport, show the internal consistency of our results and allow a quantitative estimate of the excitonic binding energies to be made. Our results demonstrate the power of ionic liquid gating in combination with nanoelectronic systems, as well as the compatibility of this technique with optical measurements on semiconducting transition metal dichalcogenides. These findings further open the way to the investigation of the optical properties of these systems in a carrier density range much broader than that explored until now. |
J Jaćimović; L Felberbaum; E Giannini; J Teyssier Electro-mechanical properties of composite materials for high-current contact applications Journal Article Journal of Physics D: Applied Physics, 47 (12), pp. 125501, 2014. @article{0022-3727-47-12-125501, title = {Electro-mechanical properties of composite materials for high-current contact applications}, author = {J Jaćimović and L Felberbaum and E Giannini and J Teyssier}, url = {http://stacks.iop.org/0022-3727/47/i=12/a=125501 http://archive-ouverte.unige.ch/unige:35126}, year = {2014}, date = {2014-03-10}, journal = {Journal of Physics D: Applied Physics}, volume = {47}, number = {12}, pages = {125501}, abstract = {We report a detailed study that compares various composite materials (CM): Ag/ZnO, Ag/SnO 2 , Ag/C, Ag/WC, Ag/WC–C and Ag/Ni used in high-current dc circuit breaker applications. Their structural, mechanical, electrical and wetting properties were investigated. In parallel, switching operation tests on the same compounds were performed on commercial high-speed circuit breakers under real conditions (30 kA–900 V). A correlation between the microscopic variables and switching performances of the CMs was established. Materials like Ag/WC and Ag/WC–C were found to be unsuitable for the reliable functionality of the device. In contrast, Ag/C and Ag/SnO 2 materials with high electrical and high thermal conductivity revealed remarkably good behaviour during switching operation tests.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We report a detailed study that compares various composite materials (CM): Ag/ZnO, Ag/SnO 2 , Ag/C, Ag/WC, Ag/WC–C and Ag/Ni used in high-current dc circuit breaker applications. Their structural, mechanical, electrical and wetting properties were investigated. In parallel, switching operation tests on the same compounds were performed on commercial high-speed circuit breakers under real conditions (30 kA–900 V). A correlation between the microscopic variables and switching performances of the CMs was established. Materials like Ag/WC and Ag/WC–C were found to be unsuitable for the reliable functionality of the device. In contrast, Ag/C and Ag/SnO 2 materials with high electrical and high thermal conductivity revealed remarkably good behaviour during switching operation tests. |
Alberto Ubaldini; Enrico Giannini Improved chemical vapor transport growth of transition metal dichalcogenides Journal Article Journal of Crystal Growth, 401 , pp. 878–882, 2014, ISSN: 0022-0248. @article{Ubaldini2014, title = {Improved chemical vapor transport growth of transition metal dichalcogenides}, author = {Alberto Ubaldini and Enrico Giannini}, url = {http://www.sciencedirect.com/science/article/pii/S0022024814000712 http://arxiv.org/abs/1401.5621}, issn = {0022-0248}, year = {2014}, date = {2014-02-12}, journal = {Journal of Crystal Growth}, volume = {401}, pages = {878–882}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
M.K. Tran; J. Levallois; P. Lerch; J. Teyssier; A.B. Kuzmenko; G. Autès; O.V. Yazyev; A. Ubaldini; E. Giannini; D. van der Marel; A. Akrap Infrared- and Raman-Spectroscopy Measurements of a Transition in the Crystal Structure and a Closing of the Energy Gap of BiTeI under Pressure Journal Article Phys. Rev. Lett., 112 , pp. 047402, 2014. @article{tran14prl, title = {Infrared- and Raman-Spectroscopy Measurements of a Transition in the Crystal Structure and a Closing of the Energy Gap of BiTeI under Pressure}, author = {M.K. Tran and J. Levallois and P. Lerch and J. Teyssier and A.B. Kuzmenko and G. Autès and O.V. Yazyev and A. Ubaldini and E. Giannini and D. van der Marel and A. Akrap}, url = {http://prl.aps.org/abstract/PRL/v112/i4/e047402 http://archive-ouverte.unige.ch/unige:34075 http://arxiv.org/abs/1305.5485}, year = {2014}, date = {2014-01-28}, journal = {Phys. Rev. Lett.}, volume = {112}, pages = {047402}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. S. Dhillon; J. Teyssier; M. Single; I. Gaponenko; M.C. Milinkovitch; M. Zwicker Interactive Diffraction from Biological Nanostructures Journal Article Computer Graphics Forum, 33 (8), pp. 177–188, 2014, ISSN: 1467-8659. @article{Dhillon2014, title = {Interactive Diffraction from Biological Nanostructures}, author = {D. S. Dhillon and J. Teyssier and M. Single and I. Gaponenko and M.C. Milinkovitch and M. Zwicker}, url = {http://dx.doi.org/10.1111/cgf.12425}, doi = {10.1111/cgf.12425}, issn = {1467-8659}, year = {2014}, date = {2014-01-01}, journal = {Computer Graphics Forum}, volume = {33}, number = {8}, pages = {177--188}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Jacimovic, Jacim; Felberbaum, Laurent; Enrico, Giannini; Jérémie, Teyssier Electro-mechanical properties and welding characteristics of Ag/MoS2, Ag/WS2, Ag/CNTs and Ag/CdO materials for high-DC current contact applications Inproceedings ICEC 2014; The 27th International Conference on Electrical Contacts; Proceedings of, pp. 1-6, 2014. @inproceedings{6857155, title = {Electro-mechanical properties and welding characteristics of Ag/MoS2, Ag/WS2, Ag/CNTs and Ag/CdO materials for high-DC current contact applications}, author = {Jacimovic, Jacim and Felberbaum, Laurent and Enrico, Giannini and Jérémie, Teyssier}, year = {2014}, date = {2014-01-01}, booktitle = {ICEC 2014; The 27th International Conference on Electrical Contacts; Proceedings of}, pages = {1-6}, abstract = {The optimisation of contact materials emerges as a cornerstone for reliable functionality of high-speed DC circuit breaker. Ag/CdO is widely used despite its RoHS non-conformity. To overcome this issue new materials are requested. We have prepared Ag/MoS2, Ag/WS2, Ag/Carbon-nanotubes composite materials and investigated their structural, mechanical, electrical and thermal properties. These materials have been used in switching operation tests on a laboratory-scale fully instrumented model of circuit breaker, under a maximum current load of 12 kA. Welding and sticking tendencies were examined. A relationship between the microscopic variables, the occurrence of welding events and their strengths was established.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } The optimisation of contact materials emerges as a cornerstone for reliable functionality of high-speed DC circuit breaker. Ag/CdO is widely used despite its RoHS non-conformity. To overcome this issue new materials are requested. We have prepared Ag/MoS2, Ag/WS2, Ag/Carbon-nanotubes composite materials and investigated their structural, mechanical, electrical and thermal properties. These materials have been used in switching operation tests on a laboratory-scale fully instrumented model of circuit breaker, under a maximum current load of 12 kA. Welding and sticking tendencies were examined. A relationship between the microscopic variables, the occurrence of welding events and their strengths was established. |
Jianing Chen; Maxim L. Nesterov; Alexey Yu. Nikitin; Sukosin Thongrattanasiri; Pablo Alonso-González; Tetiana M. Slipchenko; Florian Speck; Markus Ostler; Thomas Seyller; Iris Crassee; Frank H. L. Koppens; Luis Martin-Moreno; F. Javier García de Abajo; Alexey B. Kuzmenko; Rainer Hillenbrand Strong Plasmon Reflection at Nanometer-Size Gaps in Monolayer Graphene on SiC Journal Article Nano Letters, 13 (12), pp. 6210, 2013. @article{doi:10.1021/nl403622t, title = {Strong Plasmon Reflection at Nanometer-Size Gaps in Monolayer Graphene on SiC}, author = {Jianing Chen and Maxim L. Nesterov and Alexey Yu. Nikitin and Sukosin Thongrattanasiri and Pablo Alonso-González and Tetiana M. Slipchenko and Florian Speck and Markus Ostler and Thomas Seyller and Iris Crassee and Frank H. L. Koppens and Luis Martin-Moreno and F. Javier García de Abajo and Alexey B. Kuzmenko and Rainer Hillenbrand}, url = {http://pubs.acs.org/doi/abs/10.1021/nl403622t}, year = {2013}, date = {2013-11-04}, journal = {Nano Letters}, volume = {13}, number = {12}, pages = {6210}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Nicolas Ubrig; Iris Crassee; Julien Levallois; Ievgeniia O. Nedoliuk; Felix Fromm; Michl Kaiser; Thomas Seyller; Alexey B. Kuzmenko Fabry-Perot enhanced Faraday rotation in graphene Journal Article Opt. Express, 21 (21), pp. 24736–24741, 2013. @article{Ubrig:13, title = {Fabry-Perot enhanced Faraday rotation in graphene}, author = {Nicolas Ubrig and Iris Crassee and Julien Levallois and Ievgeniia O. Nedoliuk and Felix Fromm and Michl Kaiser and Thomas Seyller and Alexey B. Kuzmenko}, url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-21-21-24736 http://arxiv.org/abs/1303.1634 http://optics.unige.ch/Publications/ubrig_oe-21-21-24736.pdf http://archive-ouverte.unige.ch/unige:30377}, year = {2013}, date = {2013-10-09}, journal = {Opt. Express}, volume = {21}, number = {21}, pages = {24736--24741}, publisher = {OSA}, abstract = {We demonstrate that giant Faraday rotation in graphene in the terahertz range due to the cyclotron resonance is further increased by constructive Fabry-Perot interference in the supporting substrate. Simultaneously, an enhanced total transmission is achieved, making this effect doubly advantageous for graphene-based magneto-optical applications. As an example, we present far-infrared spectra of epitaxial multilayer graphene grown on the C-face of 6H-SiC, where the interference fringes are spectrally resolved and a Faraday rotation up to 0.15 radians (9°) is attained. Further, we discuss and compare other ways to increase the Faraday rotation using the principle of an optical cavity.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We demonstrate that giant Faraday rotation in graphene in the terahertz range due to the cyclotron resonance is further increased by constructive Fabry-Perot interference in the supporting substrate. Simultaneously, an enhanced total transmission is achieved, making this effect doubly advantageous for graphene-based magneto-optical applications. As an example, we present far-infrared spectra of epitaxial multilayer graphene grown on the C-face of 6H-SiC, where the interference fringes are spectrally resolved and a Faraday rotation up to 0.15 radians (9°) is attained. Further, we discuss and compare other ways to increase the Faraday rotation using the principle of an optical cavity. |
Suzanne V. Saenko; Jérémie Teyssier; Dirk van der Marel; Michel C. Milinkovitch Precise co-localisation of interacting structural and pigmentary elements generates extensive colour pattern variation in Phelsuma lizards Journal Article BMC Biology, 11 (1), pp. 105, 2013, ISSN: 1741-7007. @article{saenko_precise_2013, title = {Precise co-localisation of interacting structural and pigmentary elements generates extensive colour pattern variation in Phelsuma lizards}, author = {Suzanne V. Saenko and Jérémie Teyssier and Dirk van der Marel and Michel C. Milinkovitch}, url = {http://www.biomedcentral.com/1741-7007/11/105/abstract http://archive-ouverte.unige.ch/unige:35127}, issn = {1741-7007}, year = {2013}, date = {2013-10-07}, urldate = {2013-10-07}, journal = {BMC Biology}, volume = {11}, number = {1}, pages = {105}, abstract = {Colour traits in animals play critical roles in thermoregulation, photoprotection, camouflage, and visual communication and are amenable to objective quantification and modelling. However, the extensive variation in non-melanic pigments and structural colours in squamate reptiles has been largely disregarded. Here, we use an integrated approach to investigate the morphological basis and physical mechanisms generating variation in colour traits in tropical day geckos of the genus Phelsuma.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Colour traits in animals play critical roles in thermoregulation, photoprotection, camouflage, and visual communication and are amenable to objective quantification and modelling. However, the extensive variation in non-melanic pigments and structural colours in squamate reptiles has been largely disregarded. Here, we use an integrated approach to investigate the morphological basis and physical mechanisms generating variation in colour traits in tropical day geckos of the genus Phelsuma. |
Alberto Ubaldini; Jacim Jacimovic; Nicolas Ubrig; Enrico Giannini Chloride-Driven Chemical Vapor Transport Method for Crystal Growth of Transition Metal Dichalcogenides Journal Article Crystal Growth &amp;amp; Design, 13 , pp. 4453–4459, 2013. @article{doi:10.1021/cg400953e, title = {Chloride-Driven Chemical Vapor Transport Method for Crystal Growth of Transition Metal Dichalcogenides}, author = {Alberto Ubaldini and Jacim Jacimovic and Nicolas Ubrig and Enrico Giannini}, url = {http://pubs.acs.org/doi/abs/10.1021/cg400953e http://optics.unige.ch/Publications/2013cgd_ubaldinietal.pdf}, year = {2013}, date = {2013-10-01}, journal = {Crystal Growth &amp;amp; Design}, volume = {13}, pages = {4453–4459}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
F Cilento; S Dal Conte; G Coslovich; F Banfi; G Ferrini; H Eisaki; M Greven; A Damascelli; D van der Marel; F Parmigiani; C Giannetti In search for the pairing glue in cuprates by non-equilibrium optical spectroscopy Journal Article Journal of Physics: Conference Series, 449 (1), pp. 012003, 2013. @article{1742-6596-449-1-012003, title = {In search for the pairing glue in cuprates by non-equilibrium optical spectroscopy}, author = {F Cilento and S Dal Conte and G Coslovich and F Banfi and G Ferrini and H Eisaki and M Greven and A Damascelli and D van der Marel and F Parmigiani and C Giannetti}, url = {http://stacks.iop.org/1742-6596/449/i=1/a=012003}, year = {2013}, date = {2013-09-01}, journal = {Journal of Physics: Conference Series}, volume = {449}, number = {1}, pages = {012003}, abstract = {In strongly correlated materials the electronic and optical properties are significantly affected by the coupling of fermionic quasiparticles to different degrees of freedom, such as lattice vibrations and bosonic excitations of electronic origin. Broadband ultrafast spectroscopy [1, 2] is emerging as the premier technique to unravel the subtle interplay between quasiparticles and electronic or phononic collective excitations, by their different characteristic timescales and spectral responses. By investigating the femtosecond dynamics of the optical properties of Bi 2 Sr 2 Ca 0.92 Y 0.08 Cu 2 O 8+δ (Y-Bi2212) crystals over the 0.5–2 eV energy range, we disentangle the electronic and phononic contributions to the generalized electron-boson Eliashberg function [3, 4], showing that the spectral distribution of the electronic excitations, such as spin fluctuations and current loops, and the strength of their interaction with quasiparticles can account for the high critical temperature of the superconducting phase transition [5]. Finally, we discuss how the use of this technique can be extended to the underdoped region of the phase diagram of cuprates, in which a pseudogap in the quasiparticle density of states opens. The microscopic modeling of the interaction of ultrashort light pulses with unconventional superconductors will be one of the key challenges of the next-years materials science, eventually leading to the full understanding of the role of the electronic correlations in controlling the dynamics on the femtosecond timescale.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In strongly correlated materials the electronic and optical properties are significantly affected by the coupling of fermionic quasiparticles to different degrees of freedom, such as lattice vibrations and bosonic excitations of electronic origin. Broadband ultrafast spectroscopy [1, 2] is emerging as the premier technique to unravel the subtle interplay between quasiparticles and electronic or phononic collective excitations, by their different characteristic timescales and spectral responses. By investigating the femtosecond dynamics of the optical properties of Bi 2 Sr 2 Ca 0.92 Y 0.08 Cu 2 O 8+δ (Y-Bi2212) crystals over the 0.5–2 eV energy range, we disentangle the electronic and phononic contributions to the generalized electron-boson Eliashberg function [3, 4], showing that the spectral distribution of the electronic excitations, such as spin fluctuations and current loops, and the strength of their interaction with quasiparticles can account for the high critical temperature of the superconducting phase transition [5]. Finally, we discuss how the use of this technique can be extended to the underdoped region of the phase diagram of cuprates, in which a pseudogap in the quasiparticle density of states opens. The microscopic modeling of the interaction of ultrashort light pulses with unconventional superconductors will be one of the key challenges of the next-years materials science, eventually leading to the full understanding of the role of the electronic correlations in controlling the dynamics on the femtosecond timescale. |
Seyed Iman Mirzaei Low energy electrodynamics of high temperature superconductors PhD Thesis 2013. @phdthesis{Mirzaei2013, title = {Low energy electrodynamics of high temperature superconductors}, author = {Seyed Iman Mirzaei}, year = {2013}, date = {2013-08-30}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
Iris Crassée Magneto-optical spectroscopy of epitaxial graphene PhD Thesis 2013. @phdthesis{Crassée2013, title = {Magneto-optical spectroscopy of epitaxial graphene}, author = {Iris Crassée}, year = {2013}, date = {2013-04-19}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
Seyed Iman Mirzaei; Damien Stricker; Jason N. Hancock; Christophe Berthod; Antoine Georges; Erik van Heumen; Mun K. Chan; Xudong Zhao; Yuan Li; Martin Greven; Neven Barišić; Dirk van der Marel Spectroscopic evidence for Fermi liquid-like energy and temperature dependence of the relaxation rate in the pseudogap phase of the cuprates Journal Article Proceedings of the National Academy of Sciences, 2013. @article{Mirzaei27032013, title = {Spectroscopic evidence for Fermi liquid-like energy and temperature dependence of the relaxation rate in the pseudogap phase of the cuprates}, author = {Seyed Iman Mirzaei and Damien Stricker and Jason N. Hancock and Christophe Berthod and Antoine Georges and Erik van Heumen and Mun K. Chan and Xudong Zhao and Yuan Li and Martin Greven and Neven Barišić and Dirk van der Marel}, url = {http://www.pnas.org/content/early/2013/03/27/1218846110.abstract http://archive-ouverte.unige.ch/unige:27147 http://optics.unige.ch/web/pub/PNAS-2013-Mirzaei-1218846110.pdf}, year = {2013}, date = {2013-03-27}, journal = {Proceedings of the National Academy of Sciences}, abstract = {Cuprate high-Tc superconductors exhibit enigmatic behavior in the nonsuperconducting state. For carrier concentrations near “optimal doping” (with respect to the highest Tcs) the transport and spectroscopic properties are unlike those of a Landau–Fermi liquid. On the Mott-insulating side of the optimal carrier concentration, which corresponds to underdoping, a pseudogap removes quasi-particle spectral weight from parts of the Fermi surface and causes a breakup of the Fermi surface into disconnected nodal and antinodal sectors. Here, we show that the near-nodal excitations of underdoped cuprates obey Fermi liquid behavior. The lifetime τ(ω, T) of a quasi-particle depends on its energy ω as well as on the temperature T. For a Fermi liquid, 1/τ(ω, T) is expected to collapse on a universal function proportional to (ℏω)2 + (pπkBT)2. Magneto-transport experiments, which probe the properties in the limit ω = 0, have provided indications for the presence of a T2 dependence of the dc (ω = 0) resistivity of different cuprate materials. However, Fermi liquid behavior is very much about the energy dependence of the lifetime, and this can only be addressed by spectroscopic techniques. Our optical experiments confirm the aforementioned universal ω- and T dependence of 1/τ(ω, T), with p ∼ 1.5. Our data thus provide a piece of evidence in favor of a Fermi liquid-like scenario of the pseudogap phase of the cuprates.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Cuprate high-Tc superconductors exhibit enigmatic behavior in the nonsuperconducting state. For carrier concentrations near “optimal doping” (with respect to the highest Tcs) the transport and spectroscopic properties are unlike those of a Landau–Fermi liquid. On the Mott-insulating side of the optimal carrier concentration, which corresponds to underdoping, a pseudogap removes quasi-particle spectral weight from parts of the Fermi surface and causes a breakup of the Fermi surface into disconnected nodal and antinodal sectors. Here, we show that the near-nodal excitations of underdoped cuprates obey Fermi liquid behavior. The lifetime τ(ω, T) of a quasi-particle depends on its energy ω as well as on the temperature T. For a Fermi liquid, 1/τ(ω, T) is expected to collapse on a universal function proportional to (ℏω)2 + (pπkBT)2. Magneto-transport experiments, which probe the properties in the limit ω = 0, have provided indications for the presence of a T2 dependence of the dc (ω = 0) resistivity of different cuprate materials. However, Fermi liquid behavior is very much about the energy dependence of the lifetime, and this can only be addressed by spectroscopic techniques. Our optical experiments confirm the aforementioned universal ω- and T dependence of 1/τ(ω, T), with p ∼ 1.5. Our data thus provide a piece of evidence in favor of a Fermi liquid-like scenario of the pseudogap phase of the cuprates. |
Christophe Berthod; Jernej Mravlje; Xiaoyu Deng; Rok Zitko; Dirk van der Marel; Antoine Georges Non-Drude universal scaling laws for the optical response of local Fermi liquids Journal Article Phys. Rev. B, 87 , pp. 115109, 2013. @article{PhysRevB.87.115109, title = {Non-Drude universal scaling laws for the optical response of local Fermi liquids}, author = {Christophe Berthod and Jernej Mravlje and Xiaoyu Deng and Rok Zitko and Dirk van der Marel and Antoine Georges}, url = {http://link.aps.org/doi/10.1103/PhysRevB.87.115109 http://archive-ouverte.unige.ch/unige:26780}, year = {2013}, date = {2013-03-07}, journal = {Phys. Rev. B}, volume = {87}, pages = {115109}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. Larrea; J. Teyssier; H. M. Rϕnnow; K.-A. Lorenzer; S. Paschen High pressure electrical resistivity and specific heat of the heavy fermion compound CeCoGe2.2Si0.8 Journal Article physica status solidi (b), 250 (3), pp. 511-514, 2013. @article{PSSB:PSSB201200761, title = {High pressure electrical resistivity and specific heat of the heavy fermion compound CeCoGe2.2Si0.8}, author = {J. Larrea and J. Teyssier and H. M. Rϕnnow and K.-A. Lorenzer and S. Paschen}, url = {http://dx.doi.org/10.1002/pssb.201200761 http://archive-ouverte.unige.ch/unige:35913}, year = {2013}, date = {2013-01-01}, journal = {physica status solidi (b)}, volume = {250}, number = {3}, pages = {511-514}, publisher = {WILEY-VCH Verlag}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
R. Comin; G. Levy; B. Ludbrook; Z.-H. Zhu; C. N. Veenstra; J. A. Rosen; Yogesh Singh; P. Gegenwart; D. Stricker; J. N. Hancock; D. van der Marel; I. S. Elfimov; A. Damascelli Na2IrO3 as a Novel Relativistic Mott Insulator with a 340-meV Gap Journal Article Phys. Rev. Lett., 109 , pp. 266406, 2012. @article{PhysRevLett.109.266406, title = {Na2IrO3 as a Novel Relativistic Mott Insulator with a 340-meV Gap}, author = {R. Comin and G. Levy and B. Ludbrook and Z.-H. Zhu and C. N. Veenstra and J. A. Rosen and Yogesh Singh and P. Gegenwart and D. Stricker and J. N. Hancock and D. van der Marel and I. S. Elfimov and A. Damascelli}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.109.266406 http://archive-ouverte.unige.ch/unige:26536}, year = {2012}, date = {2012-12-27}, journal = {Phys. Rev. Lett.}, volume = {109}, pages = {266406}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. Deisenhofer; S. Schaile; J. Teyssier; Zhe Wang; M. Hemmida; H.-A. Krug von Nidda; R. M. Eremina; M. V. Eremin; R. Viennois; E. Giannini; D. van der Marel; A. Loidl Electron spin resonance and exchange paths in the orthorhombic dimer system SrVO4 Journal Article Phys. Rev. B, 86 , pp. 214417, 2012. @article{PhysRevB.86.214417, title = {Electron spin resonance and exchange paths in the orthorhombic dimer system SrVO4}, author = {J. Deisenhofer and S. Schaile and J. Teyssier and Zhe Wang and M. Hemmida and H.-A. Krug von Nidda and R. M. Eremina and M. V. Eremin and R. Viennois and E. Giannini and D. van der Marel and A. Loidl}, url = {http://link.aps.org/doi/10.1103/PhysRevB.86.214417 http://archive-ouverte.unige.ch/unige:26534 http://arxiv.org/abs/1210.1349}, year = {2012}, date = {2012-12-18}, journal = {Phys. Rev. B}, volume = {86}, pages = {214417}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
N. Ubrig; P.Blake; D.van der Marel; A. B.Kuzmenko Infrared spectroscopy of hole-doped ABA-stacked trilayer graphene Journal Article EPL, 100 (5), 2012. @article{epl2012, title = {Infrared spectroscopy of hole-doped ABA-stacked trilayer graphene}, author = {N. Ubrig and P.Blake and D.van der Marel and A. B.Kuzmenko}, url = {http://dx.doi.org/10.1209/0295-5075/100/58003 http://arxiv.org/abs/1209.0318 http://archive-ouverte.unige.ch/unige:26533}, year = {2012}, date = {2012-12-14}, journal = {EPL}, volume = {100}, number = {5}, abstract = {Using infrared spectroscopy, we investigate bottom gated ABA-stacked trilayer graphene subject to an additional environment-induced p-type doping. We find that the Slonczewski-Weiss-McClure tight-binding model and the Kubo formula reproduce the gate voltage-modulated reflectivity spectra very accurately. This allows us to determine the charge densities and the potentials of the π-band electrons on all graphene layers separately and to extract the interlayer permittivity due to higher-energy bands.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Using infrared spectroscopy, we investigate bottom gated ABA-stacked trilayer graphene subject to an additional environment-induced p-type doping. We find that the Slonczewski-Weiss-McClure tight-binding model and the Kubo formula reproduce the gate voltage-modulated reflectivity spectra very accurately. This allows us to determine the charge densities and the potentials of the π-band electrons on all graphene layers separately and to extract the interlayer permittivity due to higher-energy bands. |
Julien Levallois; Michaël Tran; Alexey B. Kuzmenko Decrypting the cyclotron effect in graphite using Kerr rotation spectroscopy Journal Article Solid State Communications, 152 (15), pp. 1294-1300, 2012. @article{Levallois20121294, title = {Decrypting the cyclotron effect in graphite using Kerr rotation spectroscopy}, author = {Julien Levallois and Michaël Tran and Alexey B. Kuzmenko}, editor = {Elsevier Ltd.}, url = {http://dx.doi.org/10.1016/j.ssc.2012.04.036 http://arxiv.org/abs/1110.2754 http://archive-ouverte.unige.ch/unige:38725}, year = {2012}, date = {2012-08-01}, journal = {Solid State Communications}, volume = {152}, number = {15}, pages = {1294-1300}, abstract = {We measure the far-infrared magneto-optical Kerr rotation and reflectivity spectra of graphite and achieve a highly accurate unified microscopic description of all data in a broad range of magnetic fields by taking rigorously the c-axis band dispersion and the trigonal warping into account. We find that the second- and the forth-order cyclotron harmonics are optically almost as strong as the fundamental resonance even at high fields. They must play, therefore, a major role in magneto-optical and magneto-plasmonic applications based on Bernal stacked graphite and multilayer graphene.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We measure the far-infrared magneto-optical Kerr rotation and reflectivity spectra of graphite and achieve a highly accurate unified microscopic description of all data in a broad range of magnetic fields by taking rigorously the c-axis band dispersion and the trigonal warping into account. We find that the second- and the forth-order cyclotron harmonics are optically almost as strong as the fundamental resonance even at high fields. They must play, therefore, a major role in magneto-optical and magneto-plasmonic applications based on Bernal stacked graphite and multilayer graphene. |
S. N. Klimin; J. Tempere; D. van der Marel; J. T. Devreese Microscopic mechanisms for the Fermi-liquid behavior of Nb-doped strontium titanate Journal Article Physical Review B, 86 , pp. 045113, 2012. @article{PRB860452012, title = {Microscopic mechanisms for the Fermi-liquid behavior of Nb-doped strontium titanate}, author = {S. N. Klimin and J. Tempere and D. van der Marel and J. T. Devreese}, url = {http://link.aps.org/doi/10.1103/PhysRevB.86.045113 http://archive-ouverte.unige.ch/unige:23936 http://optics.unige.ch/vdm/marel_files/publications/klimin2012.pdf}, year = {2012}, date = {2012-07-13}, journal = {Physical Review B}, volume = {86}, pages = {045113}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
S. Dal Conte; C. Giannetti; G. Coslovich; F. Cilento; D. Bossini; T. Abebaw; F. Banfi; G. Ferrini; H. Eisaki; M. Greven; A. Damascelli; D. van der Marel; F. Parmigiani Disentangling the Electronic and Phononic Glue in a High-T-c Superconductor Journal Article Science, 335 , pp. 1600-1603, 2012. @article{2012SCI, title = {Disentangling the Electronic and Phononic Glue in a High-T-c Superconductor}, author = {S. Dal Conte and C. Giannetti and G. Coslovich and F. Cilento and D. Bossini and T. Abebaw and F. Banfi and G. Ferrini and H. Eisaki and M. Greven and A. Damascelli and D. van der Marel and F. Parmigiani}, url = {http://www.sciencemag.org/content/335/6076/1600.abstract http://archive-ouverte.unige.ch/unige:23955 http://optics.unige.ch/vdm/marel_files/publications/DalConte2012.pdf}, year = {2012}, date = {2012-02-24}, journal = {Science}, volume = {335}, pages = {1600-1603}, abstract = {Unveiling the nature of the bosonic excitations that mediate the formation of Cooper pairs is a key issue for understanding unconventional superconductivity. A fundamental step toward this goal would be to identify the relative weight of the electronic and phononic contributions to the overall frequency (Ω)–dependent bosonic function, Π(Ω). We performed optical spectroscopy on Bi2Sr2Ca0.92Y0.08Cu2O8+δ crystals with simultaneous time and frequency resolution; this technique allowed us to disentangle the electronic and phononic contributions by their different temporal evolution. The spectral distribution of the electronic excitations and the strength of their interaction with fermionic quasiparticles fully account for the high critical temperature of the superconducting phase transition.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Unveiling the nature of the bosonic excitations that mediate the formation of Cooper pairs is a key issue for understanding unconventional superconductivity. A fundamental step toward this goal would be to identify the relative weight of the electronic and phononic contributions to the overall frequency (Ω)–dependent bosonic function, Π(Ω). We performed optical spectroscopy on Bi2Sr2Ca0.92Y0.08Cu2O8+δ crystals with simultaneous time and frequency resolution; this technique allowed us to disentangle the electronic and phononic contributions by their different temporal evolution. The spectral distribution of the electronic excitations and the strength of their interaction with fermionic quasiparticles fully account for the high critical temperature of the superconducting phase transition. |
Lerch Ph; Quaroni L; Wambach J; Schneider J; Armstrong D B; Rossetti D; Mueller F L; Peier P; Schlott V; Carroll L; Friedli P; Sigg H; Stutz S; Tran M IR beamline at the Swiss Light Source Journal Article Journal of Physics: Conference Series, 359 (1), pp. 012003, 2012. @article{Ph2012, title = {IR beamline at the Swiss Light Source}, author = {Lerch Ph and Quaroni L and Wambach J and Schneider J and Armstrong D B and Rossetti D and Mueller F L and Peier P and Schlott V and Carroll L and Friedli P and Sigg H and Stutz S and Tran M}, url = {http://stacks.iop.org/1742-6596/359/i=1/a=012003 http://archive-ouverte.unige.ch/unige:34029}, year = {2012}, date = {2012-01-01}, journal = {Journal of Physics: Conference Series}, volume = {359}, number = {1}, pages = {012003}, abstract = {The infrared beamline at the Swiss light source uses dipole radiation and is designed to transport light to four experimental stations, A, B, C, D. Branch A is dedicated to far IR work in vacuum; branch B is a micro-spectrometer; branch C is dedicated to high resolution spectroscopy in the gas phase; branch D is a pump and probe set-up. This contribution describes the optical layout and provides a brief survey of currently available experimental stations. The beamline is in regular user operation since 2009.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The infrared beamline at the Swiss light source uses dipole radiation and is designed to transport light to four experimental stations, A, B, C, D. Branch A is dedicated to far IR work in vacuum; branch B is a micro-spectrometer; branch C is dedicated to high resolution spectroscopy in the gas phase; branch D is a pump and probe set-up. This contribution describes the optical layout and provides a brief survey of currently available experimental stations. The beamline is in regular user operation since 2009. |
M Orlita; I Crassee; C Faugeras; A B Kuzmenko; F Fromm; M Ostler; Th Seyller; G Martinez; M Polini; M Potemski Classical to quantum crossover of the cyclotron resonance in graphene: a study of the strength of intraband absorption Journal Article New Journal of Physics, 14 (9), pp. 095008, 2012. @article{1367-2630-14-9-095008, title = {Classical to quantum crossover of the cyclotron resonance in graphene: a study of the strength of intraband absorption}, author = {M Orlita and I Crassee and C Faugeras and A B Kuzmenko and F Fromm and M Ostler and Th Seyller and G Martinez and M Polini and M Potemski}, url = {http://stacks.iop.org/1367-2630/14/i=9/a=095008 http://arxiv.org/abs/1205.1118}, year = {2012}, date = {2012-01-01}, journal = {New Journal of Physics}, volume = {14}, number = {9}, pages = {095008}, abstract = {We report on absolute magneto-transmission experiments on highly doped quasi-free-standing epitaxial graphene targeting the classical-to-quantum crossover of the cyclotron resonance. This study allows us to directly extract the carrier density and also other relevant quantities such as the quasiparticle velocity and the Drude weight, which is precisely measured from the strength of the cyclotron resonance. We find that the Drude weight is renormalized with respect to its non-interacting (or random phase approximation) value and that the renormalization is tied to the quasiparticle velocity enhancement. This finding is in agreement with recent theoretical predictions, which attribute the renormalization of the Drude weight in graphene to the interplay between broken Galilean invariance and electron–electron interactions.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We report on absolute magneto-transmission experiments on highly doped quasi-free-standing epitaxial graphene targeting the classical-to-quantum crossover of the cyclotron resonance. This study allows us to directly extract the carrier density and also other relevant quantities such as the quasiparticle velocity and the Drude weight, which is precisely measured from the strength of the cyclotron resonance. We find that the Drude weight is renormalized with respect to its non-interacting (or random phase approximation) value and that the renormalization is tied to the quasiparticle velocity enhancement. This finding is in agreement with recent theoretical predictions, which attribute the renormalization of the Drude weight in graphene to the interplay between broken Galilean invariance and electron–electron interactions. |
N. Tsyrulin; R. Viennois; E. Giannini; M Boehm; M. Jimenez-Ruiz; A. A. Omrani; B. Dalla Piazza; H. M. Rønnow Magnetic hour-glass dispersion and its relation to high-temperature superconductivity in iron-tuned Fe(1+y)Te(0.7)Se(0.3) Journal Article New Journal of Physics, 14 , pp. 073025, 2012. @article{TVGBJODR12, title = {Magnetic hour-glass dispersion and its relation to high-temperature superconductivity in iron-tuned Fe(1+y)Te(0.7)Se(0.3)}, author = {N. Tsyrulin and R. Viennois and E. Giannini and M Boehm and M. Jimenez-Ruiz and A. A. Omrani and B. Dalla Piazza and H. M. Rønnow}, url = {http://dx.doi.org/10.1088/1367-2630/14/7/073025}, year = {2012}, date = {2012-01-01}, journal = {New Journal of Physics}, volume = {14}, pages = {073025}, abstract = {High-temperature superconductivity remains arguably the greatest enigma of condensed matter physics. The discovery of iron-based high-temperature superconductors [1, 2] has renewed the importance of understanding superconductivity in materials susceptible to magnetic order and fluctuations. Intriguingly, they show magnetic fluctuations reminiscent of superconducting (SC) cuprates [3], including a 'resonance' and an 'hourglass'-shaped dispersion [4], which provides an opportunity to gain new insights into the coupling between spin fluctuations and superconductivity. In this paper, we report inelastic neutron scattering data on Fe1+yTe0.7Se0.3 using excess iron concentration to tune between an SC (y = 0.02) and a non-SC (y = 0.05) ground state. We find incommensurate spectra in both the samples but discover that in the one that becomes SC, a constriction toward a commensurate hourglass-shape develops well above Tc. Conversely, a spin gap and a concomitant spectral weight shift happen below Tc. Our results imply that the hourglass-shaped dispersion is most likely a prerequisite for superconductivity, whereas the spin gap and shift of spectral weight are the consequences of superconductivity. We explain this observation by pointing out that an inward dispersion toward the commensurate wave vector is needed for the opening of a spin gap to lower the magnetic exchange energy and hence provide the necessary condensation energy for the SC state to emerge.}, keywords = {}, pubstate = {published}, tppubtype = {article} } High-temperature superconductivity remains arguably the greatest enigma of condensed matter physics. The discovery of iron-based high-temperature superconductors [1, 2] has renewed the importance of understanding superconductivity in materials susceptible to magnetic order and fluctuations. Intriguingly, they show magnetic fluctuations reminiscent of superconducting (SC) cuprates [3], including a 'resonance' and an 'hourglass'-shaped dispersion [4], which provides an opportunity to gain new insights into the coupling between spin fluctuations and superconductivity. In this paper, we report inelastic neutron scattering data on Fe1+yTe0.7Se0.3 using excess iron concentration to tune between an SC (y = 0.02) and a non-SC (y = 0.05) ground state. We find incommensurate spectra in both the samples but discover that in the one that becomes SC, a constriction toward a commensurate hourglass-shape develops well above Tc. Conversely, a spin gap and a concomitant spectral weight shift happen below Tc. Our results imply that the hourglass-shaped dispersion is most likely a prerequisite for superconductivity, whereas the spin gap and shift of spectral weight are the consequences of superconductivity. We explain this observation by pointing out that an inward dispersion toward the commensurate wave vector is needed for the opening of a spin gap to lower the magnetic exchange energy and hence provide the necessary condensation energy for the SC state to emerge. |
M. Bonura; E. Giannini; R. Viennois; C. Senatore Temperature and time scaling of the peak-effect vortex configuration in FeTe0.7Se0.3 Journal Article Physical Review B, 85 , pp. 134532, 2012. @article{BGVS12, title = {Temperature and time scaling of the peak-effect vortex configuration in FeTe0.7Se0.3}, author = {M. Bonura and E. Giannini and R. Viennois and C. Senatore}, url = {http://link.aps.org/doi/10.1103/PhysRevB.85.134532 http://archive-ouverte.unige.ch/unige:36167}, year = {2012}, date = {2012-01-01}, journal = {Physical Review B}, volume = {85}, pages = {134532}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
I. Crassee; M. Orlita; M. Potemski; A. L. Walter; M. Ostler; Th. Seyller; I. Gaponenko; J. Chen; A. B. Kuzmenko Intrinsic Terahertz Plasmons and Magnetoplasmons in Large Scale Monolayer Graphene Journal Article Nano Letters, 12 (5), pp. 2470-2474, 2012. @article{CRASSNL12, title = {Intrinsic Terahertz Plasmons and Magnetoplasmons in Large Scale Monolayer Graphene}, author = {I. Crassee and M. Orlita and M. Potemski and A. L. Walter and M. Ostler and Th. Seyller and I. Gaponenko and J. Chen and A. B. Kuzmenko}, url = {http://pubs.acs.org/doi/abs/10.1021/nl300572y http://arxiv.org/abs/1204.4372 http://archive-ouverte.unige.ch/unige:38710}, year = {2012}, date = {2012-01-01}, journal = {Nano Letters}, volume = {12}, number = {5}, pages = {2470-2474}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ana Akrap; Michael Tran; Alberto Ubaldini; Jeremie Teyssier; Enrico Giannini; Dirk van der Marel; Philippe Lerch; Christopher C. Homes Optical properties of Bi2Te2Se at ambient and high pressures Journal Article Phys. Rev. B, 86 , pp. 235207, 2012. @article{PhysRevB.86.235207, title = {Optical properties of Bi2Te2Se at ambient and high pressures}, author = {Ana Akrap and Michael Tran and Alberto Ubaldini and Jeremie Teyssier and Enrico Giannini and Dirk van der Marel and Philippe Lerch and Christopher C. Homes}, url = {http://link.aps.org/doi/10.1103/PhysRevB.86.235207 http://archive-ouverte.unige.ch/unige:26535 http://arxiv.org/abs/1209.3593}, year = {2012}, date = {2012-01-01}, journal = {Phys. Rev. B}, volume = {86}, pages = {235207}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. Levallois; F. L'evy-Bertrand; M. Tran; D. Stricker; J. A. Mydosh; Y. Huang; D. van der Marel Hybridization gap and anisotropic far-infrared optical conductivity of URu_2Si_2 Journal Article Physical Review B, 84 (18), 2011. @article{LLTSMHM11, title = {Hybridization gap and anisotropic far-infrared optical conductivity of URu_2Si_2}, author = {J. Levallois and F. L'evy-Bertrand and M. Tran and D. Stricker and J. A. Mydosh and Y. Huang and D. van der Marel}, url = {http://journals.aps.org/prb/abstract/10.1103/PhysRevB.84.184420 http://arxiv.org/abs/1007.0538 http://archive-ouverte.unige.ch/unige:23937}, year = {2011}, date = {2011-01-01}, journal = {Physical Review B}, volume = {84}, number = {18}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. L. M. van Mechelen; D. van der Marel; I. Crassee; T. Kolodiazhnyi Spin Resonance in EuTiO_3 Probed by Time-Domain Gigahertz Ellipsometry Journal Article Physical Review Letters, 106 (21), 2011. @article{MMCK11, title = {Spin Resonance in EuTiO_3 Probed by Time-Domain Gigahertz Ellipsometry}, author = {J. L. M. van Mechelen and D. van der Marel and I. Crassee and T. Kolodiazhnyi}, url = {http://dx.doi.org/10.1103/PhysRevLett.106.217601 http://archive-ouverte.unige.ch/unige:23948}, year = {2011}, date = {2011-01-01}, journal = {Physical Review Letters}, volume = {106}, number = {21}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
B. Sacépé; J. B. Oostinga; L. Li; A. Ubaldini; N. J. Couto; E. Giannini; A. F. Morpurgo Gate-tuned normal and superconducting transport at the surface of a topological insulator Journal Article Nature communications, 2 , pp. 575, 2011. @article{SOLUCGM11, title = {Gate-tuned normal and superconducting transport at the surface of a topological insulator}, author = {B. Sacépé and J. B. Oostinga and L. Li and A. Ubaldini and N. J. Couto and E. Giannini and A. F. Morpurgo}, url = {http://www.nature.com/doifinder/10.1038/ncomms1586 http://archive-ouverte.unige.ch/unige:34968}, year = {2011}, date = {2011-01-01}, journal = {Nature communications}, volume = {2}, pages = {575}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Y. Talanov; L. Salakhutdinov; E. Giannini; R. Khasanov Vortex excitations above Tc in the Cuprate Superconductor Bi2Sr2Ca2Cu3O10 as revealed by ESR Journal Article Appl. Mag. Res., 40 , pp. 37–46, 2011. @article{TSGK11, title = {Vortex excitations above Tc in the Cuprate Superconductor Bi2Sr2Ca2Cu3O10 as revealed by ESR}, author = {Y. Talanov and L. Salakhutdinov and E. Giannini and R. Khasanov}, url = {http://link.springer.com/article/10.1007/s00723-010-0176-2}, year = {2011}, date = {2011-01-01}, journal = {Appl. Mag. Res.}, volume = {40}, pages = {37--46}, abstract = {Using electron spin resonance (ESR) technique we have obtained data evidencing the existence of magnetic vortices in high-temperature superconductors at temperatures above the critical one T c. We have studied magnetic excitations in Bi2Sr2Ca2Cu3O10 single crystals above T c with the method of surface spin decoration. The surface layer of diphenylpicrylhydrazyl was used as a sensitive probe of magnetic field distortions. The temperature dependence of the ESR signal parameters has indicated that far above T c the magnetic flux of a sample is affected by the superconducting order parameter fluctuations while close to T c its changes are due to vortex-type excitations.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Using electron spin resonance (ESR) technique we have obtained data evidencing the existence of magnetic vortices in high-temperature superconductors at temperatures above the critical one T c. We have studied magnetic excitations in Bi2Sr2Ca2Cu3O10 single crystals above T c with the method of surface spin decoration. The surface layer of diphenylpicrylhydrazyl was used as a sensitive probe of magnetic field distortions. The temperature dependence of the ESR signal parameters has indicated that far above T c the magnetic flux of a sample is affected by the superconducting order parameter fluctuations while close to T c its changes are due to vortex-type excitations. |
J. Teyssier; R. Viennois; E. Giannini; R. Eremina; A. Günther; J. Deisenhofer; M. Eremin; D. van der Marel Optical study of phonons and electronic excitations in tetragonal Sr_2VO_4 Journal Article Physical Review B, 84 (20), pp. 205130, 2011. @article{TVGEGDEV11a, title = {Optical study of phonons and electronic excitations in tetragonal Sr_2VO_4}, author = {J. Teyssier and R. Viennois and E. Giannini and R. Eremina and A. Günther and J. Deisenhofer and M. Eremin and D. van der Marel}, url = {http://dx.doi.org/10.1103/PhysRevB.84.205130 http://archive-ouverte.unige.ch/unige:23954}, year = {2011}, date = {2011-01-01}, journal = {Physical Review B}, volume = {84}, number = {20}, pages = {205130}, abstract = {We report on the optical excitation spectra in Sr2VO4. The phonon modes are assigned and their evolution with temperature is discussed in the frame of the different phase transitions crossed upon cooling. Besides the expected infrared-active phonons, we observe two additional excitations at about 290 and 840 cm−1, which could correspond to electronic transitions of the V4+ ions. Our experimental results are discussed in the context of recent experimental and theoretical studies of this material with a unique spin-orbital ground state.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We report on the optical excitation spectra in Sr2VO4. The phonon modes are assigned and their evolution with temperature is discussed in the frame of the different phase transitions crossed upon cooling. Besides the expected infrared-active phonons, we observe two additional excitations at about 290 and 840 cm−1, which could correspond to electronic transitions of the V4+ ions. Our experimental results are discussed in the context of recent experimental and theoretical studies of this material with a unique spin-orbital ground state. |
D. van der Marel Superconductivity: Beware of the pseudogap Journal Article Nature Physics, 7 (1), pp. 10–11, 2011. @article{Mar11, title = {Superconductivity: Beware of the pseudogap}, author = {D. van der Marel}, year = {2011}, date = {2011-01-01}, journal = {Nature Physics}, volume = {7}, number = {1}, pages = {10--11}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; M. S. Golden Superconductivity: Heike's heritage Journal Article Nature Physics, 7 (5), pp. 377–378, 2011. @article{MG11, title = {Superconductivity: Heike's heritage}, author = {D. van der Marel and M. S. Golden}, year = {2011}, date = {2011-01-01}, journal = {Nature Physics}, volume = {7}, number = {5}, pages = {377--378}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; J. Hancock Susceptible to Pairing Journal Article Physics, 4 , 2011. @article{MH11, title = {Susceptible to Pairing}, author = {D. van der Marel and J. Hancock}, year = {2011}, date = {2011-01-01}, journal = {Physics}, volume = {4}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; J. L. M. van Mechelen; I.I. Mazin Common Fermi-liquid origin of T^2 resistivity and superconductivity in n-type SrTiO_3 Journal Article Physical Review B, 84 (20), 2011. @article{MMM11, title = {Common Fermi-liquid origin of T^2 resistivity and superconductivity in n-type SrTiO_3}, author = {D. van der Marel and J. L. M. van Mechelen and I.I. Mazin}, year = {2011}, date = {2011-01-01}, journal = {Physical Review B}, volume = {84}, number = {20}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
R. Černý; D. B. Ravnsbæk; P. Schouwink; Y. Filinchuk; J. Teyssier; L. Smrok; T. R. Jensen Potassium zinc borohydrides containing triangular [Zn(BH4)3]- and tetrahedral [Zn(BH4)4]- complex anions Journal Article Journal of Physical Chemistry C, 116 (1), pp. 1563–1571, 2011. @article{&amp;amp;RSFTSJ11, title = {Potassium zinc borohydrides containing triangular [Zn(BH4)3]- and tetrahedral [Zn(BH4)4]- complex anions}, author = {R. Černý and D. B. Ravnsbæk and P. Schouwink and Y. Filinchuk and J. Teyssier and L. Smrok and T. R. Jensen}, year = {2011}, date = {2011-01-01}, journal = {Journal of Physical Chemistry C}, volume = {116}, number = {1}, pages = {1563–1571}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. Basov; R. Averitt; D. van der Marel; M. Dressel; K. Haule Electrodynamics of correlated electron materials Journal Article Reviews of Modern Physics, 83 (2), pp. 471–542, 2011. @article{BAMDH11, title = {Electrodynamics of correlated electron materials}, author = {D. Basov and R. Averitt and D. van der Marel and M. Dressel and K. Haule}, year = {2011}, date = {2011-01-01}, journal = {Reviews of Modern Physics}, volume = {83}, number = {2}, pages = {471--542}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
I. Crassee; J. Levallois; D. van der Marel; A. Walter; Th. Seyller; A. B. Kuzmenko Multicomponent magneto-optical conductivity of multilayer graphene on SiC Journal Article Physical Review B, 84 (3), 2011. @article{CLMWSK11, title = {Multicomponent magneto-optical conductivity of multilayer graphene on SiC}, author = {I. Crassee and J. Levallois and D. van der Marel and A. Walter and Th. Seyller and A. B. Kuzmenko}, url = {http://link.aps.org/doi/10.1103/PhysRevB.84.035103 http://archive-ouverte.unige.ch/unige:23949 http://arxiv.org/abs/1105.4802}, year = {2011}, date = {2011-01-01}, journal = {Physical Review B}, volume = {84}, number = {3}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
I. Crassee; J. Levallois; A. Walter; Markus Ostler; Aaron Bostwick; Eli Rotenberg; Th. Seyller; D. van der Marel; A. B. Kuzmenko Giant Faraday rotation in single- and multilayer graphene Journal Article Nature Physics, 7 (1), pp. 48–51, 2011. @article{CLWOBRSVK11, title = {Giant Faraday rotation in single- and multilayer graphene}, author = {I. Crassee and J. Levallois and A. Walter and Markus Ostler and Aaron Bostwick and Eli Rotenberg and Th. Seyller and D. van der Marel and A. B. Kuzmenko}, url = {http://www.nature.com/nphys/journal/v7/n1/full/nphys1816.html http://archive-ouverte.unige.ch/unige:23943 http://arxiv.org/abs/1007.5286}, year = {2011}, date = {2011-01-01}, journal = {Nature Physics}, volume = {7}, number = {1}, pages = {48--51}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. F. DiTusa; V. Guritanu; S. Guo; D. P. Young; P. W. Adams; R. G. Goodrich; J. Y. Chan; D. van der Marel Optical conductivity and superconductivity in LaSb 2 Journal Article Journal of Physics: Conference Series, 273 , pp. 012151, 2011. @article{DGGYAGCM11, title = {Optical conductivity and superconductivity in LaSb 2}, author = {J. F. DiTusa and V. Guritanu and S. Guo and D. P. Young and P. W. Adams and R. G. Goodrich and J. Y. Chan and D. van der Marel}, year = {2011}, date = {2011-01-01}, journal = {Journal of Physics: Conference Series}, volume = {273}, pages = {012151}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
M. Eremin; J. Deisenhofer; R. Eremina; J. Teyssier; D. van der Marel; A. Loidl Alternating spin-orbital order in tetragonal Sr_2VO_4 Journal Article Physical Review B, 84 (21), 2011. @article{EDETML11, title = {Alternating spin-orbital order in tetragonal Sr_2VO_4}, author = {M. Eremin and J. Deisenhofer and R. Eremina and J. Teyssier and D. van der Marel and A. Loidl}, year = {2011}, date = {2011-01-01}, journal = {Physical Review B}, volume = {84}, number = {21}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
C. Giannetti; F. Cilento; S. Dal Conte; G. Coslovich; G. Ferrini; H. J. A. Molegraaf; M. Raichle; R. Liang; H. Eisaki; M. Greven; A. Damascelli; D. van der Marel; F. Parmigiani Revealing the high-energy electronic excitations underlying the onset of high-temperature superconductivity in cuprates. Journal Article Nature communications, 2 , pp. 353, 2011. @article{GCCFMRLEGDMP11, title = {Revealing the high-energy electronic excitations underlying the onset of high-temperature superconductivity in cuprates.}, author = {C. Giannetti and F. Cilento and S. Dal Conte and G. Coslovich and G. Ferrini and H. J. A. Molegraaf and M. Raichle and R. Liang and H. Eisaki and M. Greven and A. Damascelli and D. van der Marel and F. Parmigiani}, year = {2011}, date = {2011-01-01}, journal = {Nature communications}, volume = {2}, pages = {353}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. Hancock; J. L. M. van Mechelen; A. B. Kuzmenko; D. van der Marel; C. Br"une; E. Novik; G. Astakhov; H. Buhmann; L. Molenkamp Surface State Charge Dynamics of a High-Mobility Three-Dimensional Topological Insulator Journal Article Physical Review Letters, 107 (13), 2011. @article{HMKMBNABM11, title = {Surface State Charge Dynamics of a High-Mobility Three-Dimensional Topological Insulator}, author = {J. Hancock and J. L. M. van Mechelen and A. B. Kuzmenko and D. van der Marel and C. Br"une and E. Novik and G. Astakhov and H. Buhmann and L. Molenkamp}, year = {2011}, date = {2011-01-01}, journal = {Physical Review Letters}, volume = {107}, number = {13}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Dook van Mechelen Charge and Spin electrodynamics of SrTiO3 and EuTiO3 studied by optical spectroscopy PhD Thesis 2010. @phdthesis{vanMechelen2010, title = {Charge and Spin electrodynamics of SrTiO3 and EuTiO3 studied by optical spectroscopy}, author = {Dook van Mechelen}, url = {http://dqmp.unige.ch/vandermarel/wp-content/uploads/2016/05/thesis_vanmechelen.pdf}, year = {2010}, date = {2010-04-19}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
W. Meevasana; X. J. Zhou; B. Moritz; C-C Chen; R. H. He; S-I Fujimori; D. H. Lu; S-K Mo; R. G. Moore; F. Baumberger; T. P. Devereaux; D. van der Marel; N. Nagaosa; J. Zaanen; Z. X. Shen Strong energy–momentum dispersion of phonon-dressed carriers in the lightly doped band insulator SrTiO 3 Journal Article New Journal of Physics, 12 (2), pp. 023004, 2010. @article{MZMCHFLMMBDMNZS10, title = {Strong energy–momentum dispersion of phonon-dressed carriers in the lightly doped band insulator SrTiO 3}, author = {W. Meevasana and X. J. Zhou and B. Moritz and C-C Chen and R. H. He and S-I Fujimori and D. H. Lu and S-K Mo and R. G. Moore and F. Baumberger and T. P. Devereaux and D. van der Marel and N. Nagaosa and J. Zaanen and Z. X. Shen}, year = {2010}, date = {2010-01-01}, journal = {New Journal of Physics}, volume = {12}, number = {2}, pages = {023004}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. Piriou; E. Giannini; Y. Fasano; C. Senatore; O. Fischer Vortex phase diagram and temperature-dependent second-peak effect in overdoped Bi2Sr2CuO6+d crystals Journal Article Physical Review B, 81 , pp. 144517, 2010. @article{PGFSF10, title = {Vortex phase diagram and temperature-dependent second-peak effect in overdoped Bi2Sr2CuO6+d crystals}, author = {A. Piriou and E. Giannini and Y. Fasano and C. Senatore and O. Fischer}, year = {2010}, date = {2010-01-01}, journal = {Physical Review B}, volume = {81}, pages = {144517}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. Teyssier; E. Giannini; V. Guritanu; R. Viennois; D. van der Marel; A. Amato; S. Gvasaliya Spin-glass ground state in Mn_1?xCo_xSi Journal Article Physical Review B, 82 (6), 2010. @article{TGGVMAG10, title = {Spin-glass ground state in Mn_1?xCo_xSi}, author = {J. Teyssier and E. Giannini and V. Guritanu and R. Viennois and D. van der Marel and A. Amato and S. Gvasaliya}, year = {2010}, date = {2010-01-01}, journal = {Physical Review B}, volume = {82}, number = {6}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. Teyssier; V. Guritanu; R. Viennois; R. Lortz; E. Giannini; D. van der Marel Two-dimensional orbital ordering in d1 Mott insulator Sr2VO4 Journal Article Journal of Physics: Conference Series, 200 , pp. 012219, 2010. @article{TGVLGV10, title = {Two-dimensional orbital ordering in d1 Mott insulator Sr2VO4}, author = {J. Teyssier and V. Guritanu and R. Viennois and R. Lortz and E. Giannini and D. van der Marel}, year = {2010}, date = {2010-01-01}, journal = {Journal of Physics: Conference Series}, volume = {200}, pages = {012219}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. Ubaldini; E. Giannini; C. Senatore; D. van der Marel BiOCuS: A new superconducting compound with oxypnictide-related structure Journal Article Physica C: Superconductivity, 470 , pp. S356–S357, 2010. @article{UGSM10, title = {BiOCuS: A new superconducting compound with oxypnictide-related structure}, author = {A. Ubaldini and E. Giannini and C. Senatore and D. van der Marel}, year = {2010}, date = {2010-01-01}, journal = {Physica C: Superconductivity}, volume = {470}, pages = {S356--S357}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
R. Viennois; E. Giannini; D. van der Marel; R. Černý Effect of Fe excess on structural, magnetic and superconducting properties of single-crystalline Fe1+xTe1?ySey Journal Article Journal of Solid State Chemistry, 183 (4), pp. 769–775, 2010. @article{VGM10, title = {Effect of Fe excess on structural, magnetic and superconducting properties of single-crystalline Fe1+xTe1?ySey}, author = {R. Viennois and E. Giannini and D. van der Marel and R. Černý}, year = {2010}, date = {2010-01-01}, journal = {Journal of Solid State Chemistry}, volume = {183}, number = {4}, pages = {769--775}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
R. Viennois; E. Giannini; D. van der Marel; R. Černý Phase Diagram of Single-Crystalline Tetragonal Iron Chalcogenides Journal Article Physica C: Superconductivity, 470 , pp. S370–S371, 2010. @article{VGV&amp;amp;10, title = {Phase Diagram of Single-Crystalline Tetragonal Iron Chalcogenides}, author = {R. Viennois and E. Giannini and D. van der Marel and R. Černý}, year = {2010}, date = {2010-01-01}, journal = {Physica C: Superconductivity}, volume = {470}, pages = {S370--S371}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
R. Viennois; E. Giannini; J. Teyssier; J. Elia; J. Deisenhofer; D. van der Marel Two-dimensional orbital ordering in d 1 Mott insulator Sr 2 VO 4 Journal Article Journal of Physics: Conference Series, 200 (1), pp. 012219, 2010. @article{VGTEDM10, title = {Two-dimensional orbital ordering in d 1 Mott insulator Sr 2 VO 4}, author = {R. Viennois and E. Giannini and J. Teyssier and J. Elia and J. Deisenhofer and D. van der Marel}, year = {2010}, date = {2010-01-01}, journal = {Journal of Physics: Conference Series}, volume = {200}, number = {1}, pages = {012219}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
M. Weigand; M. Eisterer; H. W. Weber; E. Giannini Mixed State Properties of Bi-2223 Single Crystals before and after Neutron Irradiation Journal Article Physical Review B, 81 , pp. 014516, 2010. @article{WEWG10, title = {Mixed State Properties of Bi-2223 Single Crystals before and after Neutron Irradiation}, author = {M. Weigand and M. Eisterer and H. W. Weber and E. Giannini}, year = {2010}, date = {2010-01-01}, journal = {Physical Review B}, volume = {81}, pages = {014516}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
O. Zaremba; O Shcherban; L. Akselrud; R. Gladyshevskii; F. Banfi; E. Giannini The 5:7 Member of the Spin-Ladder Series in the Bi-Sr-Ca-Cu-O System Journal Article Acta. Phys. Pol., 117 (1), pp. 42-43, 2010. @article{ZSAGBG10, title = {The 5:7 Member of the Spin-Ladder Series in the Bi-Sr-Ca-Cu-O System}, author = {O. Zaremba and O Shcherban and L. Akselrud and R. Gladyshevskii and F. Banfi and E. Giannini}, year = {2010}, date = {2010-01-01}, journal = {Acta. Phys. Pol.}, volume = {117}, number = {1}, pages = {42-43}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
N. P. Armitage; R. Tediosi; F. L'evy; E. Giannini; L. Forro; D. van der Marel Infrared Conductivity of Elemental Bismuth under Pressure: Evidence for an Avoided Lifshitz-Type Semimetal-Semiconductor Transition Journal Article Physical Review Letters, 104 (23), 2010. @article{ATLGFM10, title = {Infrared Conductivity of Elemental Bismuth under Pressure: Evidence for an Avoided Lifshitz-Type Semimetal-Semiconductor Transition}, author = {N. P. Armitage and R. Tediosi and F. L'evy and E. Giannini and L. Forro and D. van der Marel}, year = {2010}, date = {2010-01-01}, journal = {Physical Review Letters}, volume = {104}, number = {23}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. T. Devreese; S. N. Klimin; J. L. M. van Mechelen; D. van der Marel Many-body large polaron optical conductivity in SrTi_1?xNb_xO_3 Journal Article Physical Review B, 81 (12), 2010. @article{DKMM10, title = {Many-body large polaron optical conductivity in SrTi_1?xNb_xO_3}, author = {J. T. Devreese and S. N. Klimin and J. L. M. van Mechelen and D. van der Marel}, year = {2010}, date = {2010-01-01}, journal = {Physical Review B}, volume = {81}, number = {12}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
E. Giannini; R. Viennois; R. Černý; M. Hanfland Crystal chemistry, superconductivity and magnetism in iron chalcogenides Journal Article Chemistry of Metals and Alloys, 3 , pp. 63–68, 2010. @article{GV&amp;amp;H10, title = {Crystal chemistry, superconductivity and magnetism in iron chalcogenides}, author = {E. Giannini and R. Viennois and R. Černý and M. Hanfland}, year = {2010}, date = {2010-01-01}, journal = {Chemistry of Metals and Alloys}, volume = {3}, pages = {63--68}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
M. Guarise; B. Dalla Piazza; M. Moretti Sala; G. Ghiringhelli; L. Braicovich; H. Berger; J. Hancock; D. van der Marel; T. Schmitt; V. Strocov; L. Ament; J. van denBrink; P.-H. Lin; P. Xu; H. Rønnow; M. Grioni Measurement of Magnetic Excitations in the Two-Dimensional Antiferromagnetic Sr_2CuO_2Cl_2 Insulator Using Resonant X-Ray Scattering: Evidence for Extended Interactions Journal Article Physical Review Letters, 105 (15), 2010. @article{GGBBHMSSABLXRG10, title = {Measurement of Magnetic Excitations in the Two-Dimensional Antiferromagnetic Sr_2CuO_2Cl_2 Insulator Using Resonant X-Ray Scattering: Evidence for Extended Interactions}, author = {M. Guarise and B. Dalla Piazza and M. Moretti Sala and G. Ghiringhelli and L. Braicovich and H. Berger and J. Hancock and D. van der Marel and T. Schmitt and V. Strocov and L. Ament and J. van denBrink and P.-H. Lin and P. Xu and H. Rønnow and M. Grioni}, year = {2010}, date = {2010-01-01}, journal = {Physical Review Letters}, volume = {105}, number = {15}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. Hancock; S. Mirzaei; J. Gillett; S. Sebastian; J. Teyssier; R. Viennois; E. Giannini; D. van der Marel Strong coupling to magnetic fluctuations in the charge dynamics of iron-based superconductors Journal Article Physical Review B, 82 (1), 2010. @article{HMGSTVGM10, title = {Strong coupling to magnetic fluctuations in the charge dynamics of iron-based superconductors}, author = {J. Hancock and S. Mirzaei and J. Gillett and S. Sebastian and J. Teyssier and R. Viennois and E. Giannini and D. van der Marel}, year = {2010}, date = {2010-01-01}, journal = {Physical Review B}, volume = {82}, number = {1}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. Hancock; R. Viennois; D. van der Marel; H. Rønnow; M. Guarise; P.-H. Lin; M. Grioni; M. Moretti Sala; G. Ghiringhelli; V. Strocov; J. Schlappa; T. Schmitt Evidence for core-hole-mediated inelastic x-ray scattering from metallic Fe_1.087Te Journal Article Physical Review B, 82 (2), 2010. @article{HVMRGLGGSSS10, title = {Evidence for core-hole-mediated inelastic x-ray scattering from metallic Fe_1.087Te}, author = {J. Hancock and R. Viennois and D. van der Marel and H. Rønnow and M. Guarise and P.-H. Lin and M. Grioni and M. Moretti Sala and G. Ghiringhelli and V. Strocov and J. Schlappa and T. Schmitt}, year = {2010}, date = {2010-01-01}, journal = {Physical Review B}, volume = {82}, number = {2}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
E. van Heumen; Y. Huang; S. deJong; A. B. Kuzmenko; M. S. Golden; D. van der Marel Optical properties of BaFe 2-x Co x As 2 Journal Article EPL (Europhysics Letters), 90 (3), pp. 37005, 2010. @article{HHJKGM10, title = {Optical properties of BaFe 2-x Co x As 2}, author = {E. van Heumen and Y. Huang and S. deJong and A. B. Kuzmenko and M. S. Golden and D. van der Marel}, year = {2010}, date = {2010-01-01}, journal = {EPL (Europhysics Letters)}, volume = {90}, number = {3}, pages = {37005}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Erik van Heumen Towards a quantitative understanding of the high Tc phenomenon PhD Thesis 2009. @phdthesis{vanHeumen2009, title = {Towards a quantitative understanding of the high Tc phenomenon}, author = {Erik van Heumen}, url = {http://dqmp.unige.ch/vandermarel/wp-content/uploads/2016/05/thesis_vanheumen.pdf}, year = {2009}, date = {2009-01-23}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
A. B. Kuzmenko; L. Benfatto; E. Cappelluti; I. Crassee; D. van der Marel; P. Blake; K. S. Novoselov; A. K. Geim Gate Tunable Infrared Phonon Anomalies in Bilayer Graphene Journal Article Physical Review Letters, 103 (11), 2009. @article{KBCCMBNG09, title = {Gate Tunable Infrared Phonon Anomalies in Bilayer Graphene}, author = {A. B. Kuzmenko and L. Benfatto and E. Cappelluti and I. Crassee and D. van der Marel and P. Blake and K. S. Novoselov and A. K. Geim}, year = {2009}, date = {2009-01-01}, journal = {Physical Review Letters}, volume = {103}, number = {11}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. B. Kuzmenko; I. Crassee; D. van der Marel; P. Blake; K. S. Novoselov Determination of the gate-tunable band gap and tight-binding parameters in bilayer graphene using infrared spectroscopy Journal Article Physical Review B, 80 (16), 2009. @article{KCMBN09, title = {Determination of the gate-tunable band gap and tight-binding parameters in bilayer graphene using infrared spectroscopy}, author = {A. B. Kuzmenko and I. Crassee and D. van der Marel and P. Blake and K. S. Novoselov}, year = {2009}, date = {2009-01-01}, journal = {Physical Review B}, volume = {80}, number = {16}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. B. Kuzmenko; E. van Heumen; D. van der Marel; P. Blake; K. S. Novoselov; A. K. Geim Infrared spectroscopy of electronic bands in bilayer graphene Journal Article Physical Review B, 79 (11), 2009. @article{KHMBNG09, title = {Infrared spectroscopy of electronic bands in bilayer graphene}, author = {A. B. Kuzmenko and E. van Heumen and D. van der Marel and P. Blake and K. S. Novoselov and A. K. Geim}, year = {2009}, date = {2009-01-01}, journal = {Physical Review B}, volume = {79}, number = {11}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
H. J. A. Molegraaf; J. Hoffman; Carlos A. F. Vaz; S. Gariglio; D. van der Marel; Charles H. Ahn; J. M. Triscone Magnetoelectric Effects in Complex Oxides with Competing Ground States Journal Article Advanced Materials, 21 (34), pp. 3470–3474, 2009. @article{MHVGMAT09, title = {Magnetoelectric Effects in Complex Oxides with Competing Ground States}, author = {H. J. A. Molegraaf and J. Hoffman and Carlos A. F. Vaz and S. Gariglio and D. van der Marel and Charles H. Ahn and J. M. Triscone}, year = {2009}, date = {2009-01-01}, journal = {Advanced Materials}, volume = {21}, number = {34}, pages = {3470--3474}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
I. Pallecchi; G. Lamura; M. Tropeano; M. Putti; R. Viennois; E. Giannini; D. van der Marel Seebeck effect in Fe1+xTe1-ySey single crystals Journal Article Physical Review B, 80 , pp. 214511, 2009. @article{PLTPVGV09, title = {Seebeck effect in Fe1+xTe1-ySey single crystals}, author = {I. Pallecchi and G. Lamura and M. Tropeano and M. Putti and R. Viennois and E. Giannini and D. van der Marel}, year = {2009}, date = {2009-01-01}, journal = {Physical Review B}, volume = {80}, pages = {214511}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Y. Talanov; L. Salakhutdinov; E. Giannini; R. Khasanov Detection of Vortex Excitations in Bi2Sr2Ca2Cu3O10 Crystal at temperatures above the Critical Temperature by EPR of the surface layer Journal Article JETP Letters, 90 , pp. 202–206, 2009. @article{TSGK09, title = {Detection of Vortex Excitations in Bi2Sr2Ca2Cu3O10 Crystal at temperatures above the Critical Temperature by EPR of the surface layer}, author = {Y. Talanov and L. Salakhutdinov and E. Giannini and R. Khasanov}, year = {2009}, date = {2009-01-01}, journal = {JETP Letters}, volume = {90}, pages = {202--206}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
R. Tediosi; F. Carbone; A. B. Kuzmenko; J. Teyssier; D. van der Marel; J. A. Mydosh Evidence for strongly coupled charge-density-wave ordering in three-dimensional R5Ir4Si10 compounds from optical measurements Journal Article Physical Review B, 80 (3), 2009. @article{TCKTMM09, title = {Evidence for strongly coupled charge-density-wave ordering in three-dimensional R5Ir4Si10 compounds from optical measurements}, author = {R. Tediosi and F. Carbone and A. B. Kuzmenko and J. Teyssier and D. van der Marel and J. A. Mydosh}, year = {2009}, date = {2009-01-01}, journal = {Physical Review B}, volume = {80}, number = {3}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
S. Weyeneth; T. Schneider; E. Giannini Evidence for Kosterlitz-Thouless and 3D-xy critical behavior in Bi2Sr2CaCu2O8+delta Journal Article Physical Review B, 79 , pp. 214504, 2009. @article{WSG09, title = {Evidence for Kosterlitz-Thouless and 3D-xy critical behavior in Bi2Sr2CaCu2O8+delta}, author = {S. Weyeneth and T. Schneider and E. Giannini}, year = {2009}, date = {2009-01-01}, journal = {Physical Review B}, volume = {79}, pages = {214504}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
E. van Heumen; A. B. Kuzmenko; D. van der Marel Optics clues to pairing glues in high T c cuprates Journal Article Journal of Physics: Conference Series, 150 (5), pp. 052278, 2009. @article{HKM09, title = {Optics clues to pairing glues in high T c cuprates}, author = {E. van Heumen and A. B. Kuzmenko and D. van der Marel}, year = {2009}, date = {2009-01-01}, journal = {Journal of Physics: Conference Series}, volume = {150}, number = {5}, pages = {052278}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
E. van Heumen; W. Meevasana; A. B. Kuzmenko; H. Eisaki; D. van der Marel Doping-dependent optical properties of Bi2201 Journal Article New Journal of Physics, 11 (5), pp. 055067, 2009. @article{HMKEM09, title = {Doping-dependent optical properties of Bi2201}, author = {E. van Heumen and W. Meevasana and A. B. Kuzmenko and H. Eisaki and D. van der Marel}, year = {2009}, date = {2009-01-01}, journal = {New Journal of Physics}, volume = {11}, number = {5}, pages = {055067}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
E. van Heumen; E. Muhlethaler; A. B. Kuzmenko; H. Eisaki; W. Meevasana; M. Greven; D. van der Marel Optical determination of the relation between the electron-boson coupling function and the critical temperature in high- T_c cuprates Journal Article Physical Review B, 79 (18), 2009. @article{HMKEMGM09, title = {Optical determination of the relation between the electron-boson coupling function and the critical temperature in high- T_c cuprates}, author = {E. van Heumen and E. Muhlethaler and A. B. Kuzmenko and H. Eisaki and W. Meevasana and M. Greven and D. van der Marel}, year = {2009}, date = {2009-01-01}, journal = {Physical Review B}, volume = {79}, number = {18}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
N. Jenkins; Y. Fasano; C. Berthod; I. Maggio-Aprile; A. Piriou; E. Giannini; B. W. Hoogenboom; T. Cren; O. Fischer Imaging the Essential Role of Spin Fluctuations in High-Tc Superconductivity Journal Article Physical Review Letters, 103 , pp. 227001, 2009. @article{JFBMPGHCF09, title = {Imaging the Essential Role of Spin Fluctuations in High-Tc Superconductivity}, author = {N. Jenkins and Y. Fasano and C. Berthod and I. Maggio-Aprile and A. Piriou and E. Giannini and B. W. Hoogenboom and T. Cren and O. Fischer}, year = {2009}, date = {2009-01-01}, journal = {Physical Review Letters}, volume = {103}, pages = {227001}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Violeta Guritanu Optical study of strongly correlated clectrons in metals PhD Thesis 2008. @phdthesis{Guritanu2008, title = {Optical study of strongly correlated clectrons in metals}, author = {Violeta Guritanu}, url = {http://dqmp.unige.ch/vandermarel/wp-content/uploads/2016/05/thesis_guritanu.pdf}, year = {2008}, date = {2008-12-19}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
Riccardo Tediosi Pressure Tuning of Low-energy Collective Excitations in Metals PhD Thesis 2008. @phdthesis{Tediosi2008, title = {Pressure Tuning of Low-energy Collective Excitations in Metals}, author = {Riccardo Tediosi}, url = {http://dqmp.unige.ch/vandermarel/wp-content/uploads/2016/05/thesis_tediosi.pdf}, year = {2008}, date = {2008-06-13}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
A. B. Kuzmenko; E. van Heumen; F. Carbone; D. van der Marel Universal Optical Conductance of Graphite Journal Article Physical Review Letters, 100 (11), 2008. @article{KHCM08, title = {Universal Optical Conductance of Graphite}, author = {A. B. Kuzmenko and E. van Heumen and F. Carbone and D. van der Marel}, year = {2008}, date = {2008-01-01}, journal = {Physical Review Letters}, volume = {100}, number = {11}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
G. Levy de Castro; C. Berthod; A. Piriou; E. Giannini; O. Fischer Preeminent Role of the Van Hove Singularity in the Strong-Coupling Analysis of Scanning Tunneling Spectroscopy for Two-Dimensional Cuprate Superconductors Journal Article Physical Review Letters, 101 , pp. 267004, 2008. @article{LBPGF08, title = {Preeminent Role of the Van Hove Singularity in the Strong-Coupling Analysis of Scanning Tunneling Spectroscopy for Two-Dimensional Cuprate Superconductors}, author = {G. Levy de Castro and C. Berthod and A. Piriou and E. Giannini and O. Fischer}, year = {2008}, date = {2008-01-01}, journal = {Physical Review Letters}, volume = {101}, pages = {267004}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. L. M. van Mechelen; D. van der Marel; C. Grimaldi; A. B. Kuzmenko; N. P. Armitage; N. Reyren; H. Hagemann; I.I. Mazin Electron-Phonon Interaction and Charge Carrier Mass Enhancement in SrTiO3 Journal Article Physical Review Letters, 100 (22), 2008. @article{MMGKARHM08, title = {Electron-Phonon Interaction and Charge Carrier Mass Enhancement in SrTiO3}, author = {J. L. M. van Mechelen and D. van der Marel and C. Grimaldi and A. B. Kuzmenko and N. P. Armitage and N. Reyren and H. Hagemann and I.I. Mazin}, year = {2008}, date = {2008-01-01}, journal = {Physical Review Letters}, volume = {100}, number = {22}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. Piriou; Y. Fasano; E. Giannini; O. Fischer Effect of oxygen-doping on Bi2Sr2Ca2Cu3O10+d vortex matter: crossover from electromagnetic to Josephson interlayer coupling Journal Article Physical Review B, 77 , pp. 184508, 2008. @article{PFGF08, title = {Effect of oxygen-doping on Bi2Sr2Ca2Cu3O10+d vortex matter: crossover from electromagnetic to Josephson interlayer coupling}, author = {A. Piriou and Y. Fasano and E. Giannini and O. Fischer}, year = {2008}, date = {2008-01-01}, journal = {Physical Review B}, volume = {77}, pages = {184508}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. Teyssier; R. Lortz; A. Petrovic; D. van der Marel; V. Filippov; N. Shitsevalova Effect of electron-phonon coupling on the superconducting transition temperature in dodecaboride superconductors: A comparison of LuB12 with ZrB12 Journal Article Physical Review B, 78 (13), 2008. @article{TLPMFS08, title = {Effect of electron-phonon coupling on the superconducting transition temperature in dodecaboride superconductors: A comparison of LuB12 with ZrB12}, author = {J. Teyssier and R. Lortz and A. Petrovic and D. van der Marel and V. Filippov and N. Shitsevalova}, year = {2008}, date = {2008-01-01}, journal = {Physical Review B}, volume = {78}, number = {13}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. Teyssier; R. Viennois; J. Salamin; E. Giannini; D. van der Marel Experimental and first principle calculation of CoxNi(1?x)Si solid solution structural stability Journal Article Journal of Alloys and Compounds, 465 (1-2), pp. 462–467, 2008. @article{TVSGM08, title = {Experimental and first principle calculation of CoxNi(1?x)Si solid solution structural stability}, author = {J. Teyssier and R. Viennois and J. Salamin and E. Giannini and D. van der Marel}, year = {2008}, date = {2008-01-01}, journal = {Journal of Alloys and Compounds}, volume = {465}, number = {1-2}, pages = {462--467}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
F. Carbone; D. S. Yang; E. Giannini; A. Zewail Direct role of structural dynamics in electron-lattice coupling of superconducting cuprates Journal Article Proc. Natl. Acad. Sci., 105 (51), pp. 20161, 2008. @article{CYGZ08, title = {Direct role of structural dynamics in electron-lattice coupling of superconducting cuprates}, author = {F. Carbone and D. S. Yang and E. Giannini and A. Zewail}, year = {2008}, date = {2008-01-01}, journal = {Proc. Natl. Acad. Sci.}, volume = {105}, number = {51}, pages = {20161}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. Deisenhofer; I. Leonov; M. Eremin; Ch. Kant; P. Ghigna; F. Mayr; V. Iglamov; V. Anisimov; D. van der Marel Optical Evidence for Symmetry Changes above the Nëel Temperature of KCuF3 Journal Article Physical Review Letters, 101 (15), 2008. @article{DLEKGMIAM08, title = {Optical Evidence for Symmetry Changes above the Nëel Temperature of KCuF3}, author = {J. Deisenhofer and I. Leonov and M. Eremin and Ch. Kant and P. Ghigna and F. Mayr and V. Iglamov and V. Anisimov and D. van der Marel}, year = {2008}, date = {2008-01-01}, journal = {Physical Review Letters}, volume = {101}, number = {15}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
E. Giannini; R. Gladyshevskii; N. Clayton; N. Musolino; V. Garnier; A. Piriou; R. Fl"ukiger Growth, structure and physical properties of single crystals of pure and Pb doped Bi-based high Tc superconductors Journal Article Curr. Appl. Phys., 8 , pp. 115, 2008. @article{GGCMGPF08, title = {Growth, structure and physical properties of single crystals of pure and Pb doped Bi-based high Tc superconductors}, author = {E. Giannini and R. Gladyshevskii and N. Clayton and N. Musolino and V. Garnier and A. Piriou and R. Fl"ukiger}, year = {2008}, date = {2008-01-01}, journal = {Curr. Appl. Phys.}, volume = {8}, pages = {115}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
V. Guritanu; N. P. Armitage; R. Tediosi; S. Saxena; A. Huxley; D. van der Marel Optical spectra of the heavy fermion uniaxial ferromagnet UGe2 Journal Article Physical Review B, 78 (17), 2008. @article{GATSHM08, title = {Optical spectra of the heavy fermion uniaxial ferromagnet UGe2}, author = {V. Guritanu and N. P. Armitage and R. Tediosi and S. Saxena and A. Huxley and D. van der Marel}, year = {2008}, date = {2008-01-01}, journal = {Physical Review B}, volume = {78}, number = {17}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
E. van Heumen; E. Muhlethaler; A. B. Kuzmenko; D. van der Marel; H. Eisaki; M. Greven; W. Meevasana; Z. X. Shen Observation of a robust peak in the glue function of the high-Tc cuprates in the 50-60 meV range Journal Article Condmat:arXiv, pp. 6, 2008. @article{HMKMEGMS08, title = {Observation of a robust peak in the glue function of the high-Tc cuprates in the 50-60 meV range}, author = {E. van Heumen and E. Muhlethaler and A. B. Kuzmenko and D. van der Marel and H. Eisaki and M. Greven and W. Meevasana and Z. X. Shen}, year = {2008}, date = {2008-01-01}, journal = {Condmat:arXiv}, pages = {6}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Fabrizio Carbone Spectroscopic signatures of electronic correlations in superconductors and magnets PhD Thesis 2007. @phdthesis{Carbone2007, title = {Spectroscopic signatures of electronic correlations in superconductors and magnets}, author = {Fabrizio Carbone}, url = {http://dqmp.unige.ch/vandermarel/wp-content/uploads/2016/05/thesis_carbone.pdf}, year = {2007}, date = {2007-01-05}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
A. B. Kuzmenko; D. van der Marel; F. Carbone; F. Marsiglio Model-independent sum rule analysis based on limited-range spectral data Journal Article New Journal of Physics, 9 (7), pp. 229–229, 2007. @article{KMCM07, title = {Model-independent sum rule analysis based on limited-range spectral data}, author = {A. B. Kuzmenko and D. van der Marel and F. Carbone and F. Marsiglio}, url = {http://dx.doi.org/10.1088/1367-2630/9/7/229 http://archive-ouverte.unige.ch/unige:24286}, year = {2007}, date = {2007-01-01}, journal = {New Journal of Physics}, volume = {9}, number = {7}, pages = {229--229}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
M. Norman; A. Chubukov; E. van Heumen; A. B. Kuzmenko; D. van der Marel Optical integral in the cuprates and the question of sum-rule violation Journal Article Physical Review B, 76 (22), 2007. @article{NCHKM07, title = {Optical integral in the cuprates and the question of sum-rule violation}, author = {M. Norman and A. Chubukov and E. van Heumen and A. B. Kuzmenko and D. van der Marel}, year = {2007}, date = {2007-01-01}, journal = {Physical Review B}, volume = {76}, number = {22}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
F. Ronning; C. Capan; N. Moreno; J. Thompson; L. Bulaevskii; R. Movshovich; D. van der Marel Magnetic excitations of the 2-D Sm spin layers in Sm(La,Sr)CuO4Sm(La,Sr)CuO4 Journal Article Journal of Magnetism and Magnetic Materials, 310 (2), pp. e392–e393, 2007. @article{RCMTBMM07, title = {Magnetic excitations of the 2-D Sm spin layers in Sm(La,Sr)CuO4Sm(La,Sr)CuO4}, author = {F. Ronning and C. Capan and N. Moreno and J. Thompson and L. Bulaevskii and R. Movshovich and D. van der Marel}, year = {2007}, date = {2007-01-01}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {310}, number = {2}, pages = {e392--e393}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
R. Tediosi; N. P. Armitage; E. Giannini; D. van der Marel Charge Carrier Interaction with a Purely Electronic Collective Mode: Plasmarons and the Infrared Response of Elemental Bismuth Journal Article Physical Review Letters, 99 (1), 2007. @article{TAGM07, title = {Charge Carrier Interaction with a Purely Electronic Collective Mode: Plasmarons and the Infrared Response of Elemental Bismuth}, author = {R. Tediosi and N. P. Armitage and E. Giannini and D. van der Marel}, year = {2007}, date = {2007-01-01}, journal = {Physical Review Letters}, volume = {99}, number = {1}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. Teyssier; A. B. Kuzmenko; D. van der Marel; F. Marsiglio; A. Liashchenko; N. Shitsevalova; V. Filippov Optical study of electronic structure and electron-phonon coupling in ZrB12 Journal Article Physical Review B, 75 (13), 2007. @article{TKMMLSF07, title = {Optical study of electronic structure and electron-phonon coupling in ZrB12}, author = {J. Teyssier and A. B. Kuzmenko and D. van der Marel and F. Marsiglio and A. Liashchenko and N. Shitsevalova and V. Filippov}, year = {2007}, date = {2007-01-01}, journal = {Physical Review B}, volume = {75}, number = {13}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
K. Burch; S. Dordevic; F. P. Mena; A. B. Kuzmenko; D. van der Marel; J. Sarrao; J. Jeffries; E. Bauer; M. Maple; D. Basov Optical signatures of momentum-dependent hybridization of the local moments and conduction electrons in Kondo lattices Journal Article Physical Review B, 75 (5), 2007. @article{BDMKMSJBMB07, title = {Optical signatures of momentum-dependent hybridization of the local moments and conduction electrons in Kondo lattices}, author = {K. Burch and S. Dordevic and F. P. Mena and A. B. Kuzmenko and D. van der Marel and J. Sarrao and J. Jeffries and E. Bauer and M. Maple and D. Basov}, year = {2007}, date = {2007-01-01}, journal = {Physical Review B}, volume = {75}, number = {5}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
V. Guritanu; D. van der Marel; J. Teyssier; Th. Jarlborg; H. Wilhelm; M. Schmidt; F. Steglich Optical evidence for heavy charge carriers in FeGe Journal Article Physical Review B, 75 (15), 2007. @article{GMTJWSS07, title = {Optical evidence for heavy charge carriers in FeGe}, author = {V. Guritanu and D. van der Marel and J. Teyssier and Th. Jarlborg and H. Wilhelm and M. Schmidt and F. Steglich}, year = {2007}, date = {2007-01-01}, journal = {Physical Review B}, volume = {75}, number = {15}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
E. van Heumen; R. Lortz; A. B. Kuzmenko; F. Carbone; D. van der Marel; X. Zhao; G. Yu; Y. Cho; N. Barisic; M. Greven; C. C. Homes; S. Dordevic Optical and thermodynamic properties of the high-temperature superconductor HgBa2CuO4+$delta$ Journal Article Physical Review B, 75 (5), 2007. @article{HLKCMZYCBGHD07, title = {Optical and thermodynamic properties of the high-temperature superconductor HgBa2CuO4+$delta$}, author = {E. van Heumen and R. Lortz and A. B. Kuzmenko and F. Carbone and D. van der Marel and X. Zhao and G. Yu and Y. Cho and N. Barisic and M. Greven and C. C. Homes and S. Dordevic}, year = {2007}, date = {2007-01-01}, journal = {Physical Review B}, volume = {75}, number = {5}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
F. Marsiglio; F. Carbone; A. B. Kuzmenko; D. van der Marel Intraband optical spectral weight in the presence of a van Hove singularity: Application to Bi2Sr2CaCu2O8+$delta$ Journal Article Physical Review B, 74 (17), 2006. @article{MCKM06, title = {Intraband optical spectral weight in the presence of a van Hove singularity: Application to Bi2Sr2CaCu2O8+$delta$}, author = {F. Marsiglio and F. Carbone and A. B. Kuzmenko and D. van der Marel}, year = {2006}, date = {2006-01-01}, journal = {Physical Review B}, volume = {74}, number = {17}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
F. P. Mena; J. F. DiTusa; D. van der Marel; G. Aeppli; D. P. Young; A. Damascelli; J. A. Mydosh Suppressed reflectivity due to spin-controlled localization in a magnetic semiconductor Journal Article Physical Review B, 73 (8), 2006. @article{MDMAYDM06, title = {Suppressed reflectivity due to spin-controlled localization in a magnetic semiconductor}, author = {F. P. Mena and J. F. DiTusa and D. van der Marel and G. Aeppli and D. P. Young and A. Damascelli and J. A. Mydosh}, year = {2006}, date = {2006-01-01}, journal = {Physical Review B}, volume = {73}, number = {8}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
K. Rogacki; B. Batlogg; J. Karpinski; N. Zhigadlo; G. Schuck; S. Kazakov; P. W"agli; R. Puźniak; A. Wiśniewski; F. Carbone; A. Brinkman; D. van der Marel Strong magnetic pair breaking in Mn-substituted MgB2 single crystals Journal Article Physical Review B, 73 (17), 2006. @article{RBKZSKWPWCBM06, title = {Strong magnetic pair breaking in Mn-substituted MgB2 single crystals}, author = {K. Rogacki and B. Batlogg and J. Karpinski and N. Zhigadlo and G. Schuck and S. Kazakov and P. W"agli and R. Puźniak and A. Wiśniewski and F. Carbone and A. Brinkman and D. van der Marel}, year = {2006}, date = {2006-01-01}, journal = {Physical Review B}, volume = {73}, number = {17}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
P. Romaniello; P. deBoeij; F. Carbone; D. van der Marel Optical properties of bcc transition metals in the range 0–40eV Journal Article Physical Review B, 73 (7), 2006. @article{RBCM06, title = {Optical properties of bcc transition metals in the range 0–40eV}, author = {P. Romaniello and P. deBoeij and F. Carbone and D. van der Marel}, year = {2006}, date = {2006-01-01}, journal = {Physical Review B}, volume = {73}, number = {7}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel Superconductors: Electrons living apart together Journal Article Nature Physics, 2 (9), pp. 585–586, 2006. @article{Mar06, title = {Superconductors: Electrons living apart together}, author = {D. van der Marel}, year = {2006}, date = {2006-01-01}, journal = {Nature Physics}, volume = {2}, number = {9}, pages = {585--586}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; F. Carbone; A. B. Kuzmenko; E. Giannini Scaling properties of the optical conductivity of Bi-based cuprates Journal Article Annals of Physics, 321 (7), pp. 1716–1729, 2006. @article{MCKG06, title = {Scaling properties of the optical conductivity of Bi-based cuprates}, author = {D. van der Marel and F. Carbone and A. B. Kuzmenko and E. Giannini}, year = {2006}, date = {2006-01-01}, journal = {Annals of Physics}, volume = {321}, number = {7}, pages = {1716--1729}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
F. Carbone; A. B. Kuzmenko; H. J. A. Molegraaf; E. van Heumen; E. Giannini; D. van der Marel In-plane optical spectral weight transfer in optimally doped Bi2Sr2Ca2Cu3O10 Journal Article Physical Review B, 74 (2), 2006. @article{CKMHGM06, title = {In-plane optical spectral weight transfer in optimally doped Bi2Sr2Ca2Cu3O10}, author = {F. Carbone and A. B. Kuzmenko and H. J. A. Molegraaf and E. van Heumen and E. Giannini and D. van der Marel}, year = {2006}, date = {2006-01-01}, journal = {Physical Review B}, volume = {74}, number = {2}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
F. Carbone; A. B. Kuzmenko; H. J. A. Molegraaf; E. van Heumen; V. Lukovac; F. Marsiglio; D. van der Marel; H. Berger; S. Courjault; P. H. Kes; M. Li Doping dependence of the redistribution of optical spectral weight in Bi_2Sr_2CaCu_2O_8+δ Journal Article Physical Review B, 74 (6), 2006. @article{CKMHLMMBCKL06, title = {Doping dependence of the redistribution of optical spectral weight in Bi_2Sr_2CaCu_2O_8+δ}, author = {F. Carbone and A. B. Kuzmenko and H. J. A. Molegraaf and E. van Heumen and V. Lukovac and F. Marsiglio and D. van der Marel and H. Berger and S. Courjault and P. H. Kes and M. Li}, year = {2006}, date = {2006-01-01}, journal = {Physical Review B}, volume = {74}, number = {6}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
F. Carbone; M. Zangrando; A. Brinkman; A. Nicolaou; F. Bondino; E. Magnano; A.A. Nugroho; F. Parmigiani; Th. Jarlborg; D. van der Marel Electronic structure of MnSi: The role of electron-electron interactions Journal Article Physical Review B, 73 (8), 2006. @article{CZBNBMNPJM06, title = {Electronic structure of MnSi: The role of electron-electron interactions}, author = {F. Carbone and M. Zangrando and A. Brinkman and A. Nicolaou and F. Bondino and E. Magnano and A.A. Nugroho and F. Parmigiani and Th. Jarlborg and D. van der Marel}, year = {2006}, date = {2006-01-01}, journal = {Physical Review B}, volume = {73}, number = {8}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. L. Feng; Z. X. Shen; X. J. Zhou; K. M. Shen; D. H. Lu; D. van der Marel Puzzles about 1/8 magic doping in cuprate Journal Article Journal of Physics and Chemistry of Solids, 67 (1-3), pp. 198–200, 2006. @article{FSZSLM06, title = {Puzzles about 1/8 magic doping in cuprate}, author = {D. L. Feng and Z. X. Shen and X. J. Zhou and K. M. Shen and D. H. Lu and D. van der Marel}, year = {2006}, date = {2006-01-01}, journal = {Journal of Physics and Chemistry of Solids}, volume = {67}, number = {1-3}, pages = {198--200}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
V. Guritanu; A. B. Kuzmenko; D. van der Marel; S. Kazakov; N. Zhigadlo; J. Karpinski Anisotropic optical conductivity and two colors of MgB2 Journal Article Physical Review B, 73 (10), 2006. @article{GKMKZK06, title = {Anisotropic optical conductivity and two colors of MgB2}, author = {V. Guritanu and A. B. Kuzmenko and D. van der Marel and S. Kazakov and N. Zhigadlo and J. Karpinski}, year = {2006}, date = {2006-01-01}, journal = {Physical Review B}, volume = {73}, number = {10}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
E. van Heumen; D. van der Marel Optical probes of electron correlations in solids Inproceedings Avella., Manzini F; A., (Ed.): AIP Conference Proceedings 918, 2006. @inproceedings{HM06, title = {Optical probes of electron correlations in solids}, author = {E. van Heumen and D. van der Marel}, editor = {Avella., F. Manzini and A.}, year = {2006}, date = {2006-01-01}, booktitle = {AIP Conference Proceedings 918}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Hajo J. A. Molegraaf Signposts to the mechanism of superconductivity in the cuprates PhD Thesis 2005. @phdthesis{Molegraaf2005, title = {Signposts to the mechanism of superconductivity in the cuprates}, author = {Hajo J. A. Molegraaf}, url = {http://dqmp.unige.ch/vandermarel/wp-content/uploads/2016/05/thesis_molegraaf.pdf}, year = {2005}, date = {2005-02-18}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
A. B. Kuzmenko; H. J. A. Molegraaf; F. Carbone; D. van der Marel Superconductivity-Induced Transfer of In-Plane Spectral Weight in Bi2Sr2CaCu2O8: Resolving a Controversy Journal Article Condmat:arXiv, pp. 9, 2005. @article{KMCM05, title = {Superconductivity-Induced Transfer of In-Plane Spectral Weight in Bi2Sr2CaCu2O8: Resolving a Controversy}, author = {A. B. Kuzmenko and H. J. A. Molegraaf and F. Carbone and D. van der Marel}, year = {2005}, date = {2005-01-01}, journal = {Condmat:arXiv}, pages = {9}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. B. Kuzmenko; H. J. A. Molegraaf; F. Carbone; D. van der Marel Temperature-modulation analysis of superconductivity-induced transfer of in-plane spectral weight in Bi2Sr2CaCu2O8 Journal Article Physical Review B, 72 (14), 2005. @article{KMCM05a, title = {Temperature-modulation analysis of superconductivity-induced transfer of in-plane spectral weight in Bi2Sr2CaCu2O8}, author = {A. B. Kuzmenko and H. J. A. Molegraaf and F. Carbone and D. van der Marel}, year = {2005}, date = {2005-01-01}, journal = {Physical Review B}, volume = {72}, number = {14}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
F. P. Mena; D. van der Marel; J. Sarrao Optical conductivity of CeMIn5 (M=Co, Rh, Ir) Journal Article Physical Review B, 72 (4), 2005. @article{MMS05, title = {Optical conductivity of CeMIn5 (M=Co, Rh, Ir)}, author = {F. P. Mena and D. van der Marel and J. Sarrao}, year = {2005}, date = {2005-01-01}, journal = {Physical Review B}, volume = {72}, number = {4}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
F. P. Mena; A. B. Kuzmenko; A. Hadipour; J. L. M. van Mechelen; D. van der Marel; N. Babushkina Oxygen isotope effect and phase separation in the optical conductivity of (La0.5Pr0.5)0.7Ca0.3MnO3 thin films Journal Article Physical Review B, 72 (13), 2005. @article{MKHMMB05, title = {Oxygen isotope effect and phase separation in the optical conductivity of (La0.5Pr0.5)0.7Ca0.3MnO3 thin films}, author = {F. P. Mena and A. B. Kuzmenko and A. Hadipour and J. L. M. van Mechelen and D. van der Marel and N. Babushkina}, year = {2005}, date = {2005-01-01}, journal = {Physical Review B}, volume = {72}, number = {13}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Fausto Patricio Mena Optics and magnetism: from itinerant to localized electrons PhD Thesis 2004. @phdthesis{Mena2004, title = {Optics and magnetism: from itinerant to localized electrons}, author = {Fausto Patricio Mena}, url = {http://dqmp.unige.ch/vandermarel/wp-content/uploads/2016/05/thesis_mena.pdf}, year = {2004}, date = {2004-09-17}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
F. P. Mena; J. F. DiTusa; D. van der Marel; G. Aeppli; D. P. Young; C. N. Presura; A. Damascelli; J. A. Mydosh Ferromagnetism makes a doped semiconductor less shiny Journal Article Condmat:arXiv, pp. 5, 2004. @article{MDMAYPDM04, title = {Ferromagnetism makes a doped semiconductor less shiny}, author = {F. P. Mena and J. F. DiTusa and D. van der Marel and G. Aeppli and D. P. Young and C. N. Presura and A. Damascelli and J. A. Mydosh}, year = {2004}, date = {2004-01-01}, journal = {Condmat:arXiv}, pages = {5}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. A. Tsvetkov; F. P. Mena; P.H.M. van Loosdrecht; D. van der Marel; Y. Ren; A.A. Nugroho; A. A. Menovsky; I. S. Elfimov; G. A. Sawatzky Structural, electronic, and magneto-optical properties of YVO3 Journal Article Physical Review B, 69 (7), 2004. @article{TMLMRNMES04, title = {Structural, electronic, and magneto-optical properties of YVO3}, author = {A. A. Tsvetkov and F. P. Mena and P.H.M. van Loosdrecht and D. van der Marel and Y. Ren and A.A. Nugroho and A. A. Menovsky and I. S. Elfimov and G. A. Sawatzky}, year = {2004}, date = {2004-01-01}, journal = {Physical Review B}, volume = {69}, number = {7}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel Optical signatures of electron correlations in the cuprates Incollection Strong interactions in low dimensions, Springer, 2004. @incollection{Mar04, title = {Optical signatures of electron correlations in the cuprates}, author = {D. van der Marel}, year = {2004}, date = {2004-01-01}, booktitle = {Strong interactions in low dimensions}, publisher = {Springer}, chapter = {8}, keywords = {}, pubstate = {published}, tppubtype = {incollection} } |
D. van der Marel Short-range spin- and pair-correlations: a variational wave-function Journal Article Synthetic Metals, 141 (1-2), pp. 149–154, 2004. @article{Mar04a, title = {Short-range spin- and pair-correlations: a variational wave-function}, author = {D. van der Marel}, year = {2004}, date = {2004-01-01}, journal = {Synthetic Metals}, volume = {141}, number = {1-2}, pages = {149--154}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel Electrons and bursting waterworks Journal Article physica status solidi (b), 241 (7), pp. 1391–1392, 2004. @article{Mar04b, title = {Electrons and bursting waterworks}, author = {D. van der Marel}, year = {2004}, date = {2004-01-01}, journal = {physica status solidi (b)}, volume = {241}, number = {7}, pages = {1391--1392}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel Optical Spectroscopy of Plasmons and Excitons in Cuprate Superconductors Journal Article Journal of Superconductivity, 17 (5), pp. 559–575, 2004. @article{Mar04c, title = {Optical Spectroscopy of Plasmons and Excitons in Cuprate Superconductors}, author = {D. van der Marel}, year = {2004}, date = {2004-01-01}, journal = {Journal of Superconductivity}, volume = {17}, number = {5}, pages = {559--575}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Cristian Nicolae Presura Energetics and ordering in strongly correlated oxides as seen in optics PhD Thesis 2003. @phdthesis{Presura2003, title = {Energetics and ordering in strongly correlated oxides as seen in optics}, author = {Cristian Nicolae Presura}, url = {http://dqmp.unige.ch/vandermarel/wp-content/uploads/2016/05/thesis_presura.pdf}, year = {2003}, date = {2003-05-23}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
C. A. Kuntscher; D. van der Marel; M. Dressel; F. Lichtenberg; J. Mannhart Signatures of polaronic excitations in quasi-one-dimensional LaTiO3.41 Journal Article Physical Review B, 67 (3), 2003. @article{KMDLM03, title = {Signatures of polaronic excitations in quasi-one-dimensional LaTiO3.41}, author = {C. A. Kuntscher and D. van der Marel and M. Dressel and F. Lichtenberg and J. Mannhart}, year = {2003}, date = {2003-01-01}, journal = {Physical Review B}, volume = {67}, number = {3}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. B. Kuzmenko; N. Tombros; H. J. A. Molegraaf; M. Gr"uninger; D. van der Marel; S. Uchida c-Axis Optical Sum Rule and a Possible New Collective Mode in La2-xSrxCuO4 Journal Article Physical Review Letters, 91 (3), 2003. @article{KTMGMU03, title = {c-Axis Optical Sum Rule and a Possible New Collective Mode in La2-xSrxCuO4}, author = {A. B. Kuzmenko and N. Tombros and H. J. A. Molegraaf and M. Gr"uninger and D. van der Marel and S. Uchida}, year = {2003}, date = {2003-01-01}, journal = {Physical Review Letters}, volume = {91}, number = {3}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
F. P. Mena; D. van der Marel; A. Damascelli; M. F"ath; A. A. Menovsky; J. A. Mydosh Heavy carriers and non-Drude optical conductivity in MnSi Journal Article Physical Review B, 67 (24), 2003. @article{MMDFMM03, title = {Heavy carriers and non-Drude optical conductivity in MnSi}, author = {F. P. Mena and D. van der Marel and A. Damascelli and M. F"ath and A. A. Menovsky and J. A. Mydosh}, year = {2003}, date = {2003-01-01}, journal = {Physical Review B}, volume = {67}, number = {24}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
C. N. Presura; M. Popinciuc; P.H.M. van Loosdrecht; D. van der Marel; M. Mostovoy; T. Yamauchi; Y. Ueda Charge-Ordering Signatures in the Optical Properties of $eta$-Na0.33V2O5 Journal Article Physical Review Letters, 90 (2), 2003. @article{PPLMMYU03, title = {Charge-Ordering Signatures in the Optical Properties of $eta$-Na0.33V2O5}, author = {C. N. Presura and M. Popinciuc and P.H.M. van Loosdrecht and D. van der Marel and M. Mostovoy and T. Yamauchi and Y. Ueda}, year = {2003}, date = {2003-01-01}, journal = {Physical Review Letters}, volume = {90}, number = {2}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
S. Tajima; S. Uchida; D. van der Marel; D. Basov Comment on “Phase Diagram of La2-xSrxCuO4 Probed in the Infrared: Imprints of Charge Stripe Excitations” Journal Article Physical Review Letters, 91 (12), 2003. @article{TUMB03, title = {Comment on “Phase Diagram of La2-xSrxCuO4 Probed in the Infrared: Imprints of Charge Stripe Excitations”}, author = {S. Tajima and S. Uchida and D. van der Marel and D. Basov}, year = {2003}, date = {2003-01-01}, journal = {Physical Review Letters}, volume = {91}, number = {12}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. A. Tsvetkov; D.M. Sagar; P.H.M. van Loosdrecht; D. van der Marel; S. van Smaalen Selective coherent excitation of charge density waves. Journal Article Acta Physica Polonica B, 34 , pp. 387, 2003. @article{TSLMS03, title = {Selective coherent excitation of charge density waves.}, author = {A. A. Tsvetkov and D.M. Sagar and P.H.M. van Loosdrecht and D. van der Marel and S. van Smaalen}, year = {2003}, date = {2003-01-01}, journal = {Acta Physica Polonica B}, volume = {34}, pages = {387}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; H. J. A. Molegraaf; C. N. Presura; I. Santoso Superconductivity by Kinetic Energy Saving? Incollection Hewson, A; Zlatic, V (Ed.): Concepts in electron correlation, pp. 7–16, Kluwer, 2003. @incollection{MMPS03, title = {Superconductivity by Kinetic Energy Saving?}, author = {D. van der Marel and H. J. A. Molegraaf and C. N. Presura and I. Santoso}, editor = {Hewson, A. and Zlatic, V.}, year = {2003}, date = {2003-01-01}, booktitle = {Concepts in electron correlation}, pages = {7--16}, publisher = {Kluwer}, keywords = {}, pubstate = {published}, tppubtype = {incollection} } |
D. van der Marel; H. J. A. Molegraaf; J. Zaanen; Z. Nussinov; F. Carbone; A. Damascelli; H. Eisaki; M. Greven; P. H. Kes; M. Li Quantum critical behaviour in a high-T(c) superconductor. Journal Article Nature, 425 (6955), pp. 271–4, 2003. @article{MMZNCDEGKL03, title = {Quantum critical behaviour in a high-T(c) superconductor.}, author = {D. van der Marel and H. J. A. Molegraaf and J. Zaanen and Z. Nussinov and F. Carbone and A. Damascelli and H. Eisaki and M. Greven and P. H. Kes and M. Li}, year = {2003}, date = {2003-01-01}, journal = {Nature}, volume = {425}, number = {6955}, pages = {271--4}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. B. Kuzmenko; F. P. Mena; H. J. A. Molegraaf; D. van der Marel; B. P. Gorshunov; M. Dressel; I.I. Mazin; J. Kortus; O. V. Dolgov; T. Muranaka; J. Akimitsu Manifestation of multiband optical properties of MgB2 Journal Article Solid State Communications, 121 (9-10), pp. 479–484, 2002. @article{KMMMGDMKDMA02, title = {Manifestation of multiband optical properties of MgB2}, author = {A. B. Kuzmenko and F. P. Mena and H. J. A. Molegraaf and D. van der Marel and B. P. Gorshunov and M. Dressel and I.I. Mazin and J. Kortus and O. V. Dolgov and T. Muranaka and J. Akimitsu}, year = {2002}, date = {2002-01-01}, journal = {Solid State Communications}, volume = {121}, number = {9-10}, pages = {479--484}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
P.H.M. van Loosdrecht; C. N. Presura; M. Popinciuc; D. van der Marel; G. Maris; T. T. M. Palstra; P. J. M. van Bentum; H. Yamada; T. Yamauchi; Y. Ueda Charge and Sodium Ordering in $eta$-Na0.33V2O3 Journal Article Journal of Superconductivity, 15 (6), pp. 587–590, 2002. @article{LPPMMPBYYU02, title = {Charge and Sodium Ordering in $eta$-Na0.33V2O3}, author = {P.H.M. van Loosdrecht and C. N. Presura and M. Popinciuc and D. van der Marel and G. Maris and T. T. M. Palstra and P. J. M. van Bentum and H. Yamada and T. Yamauchi and Y. Ueda}, year = {2002}, date = {2002-01-01}, journal = {Journal of Superconductivity}, volume = {15}, number = {6}, pages = {587--590}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
I.I. Mazin; O. K. Andersen; O. Jepsen; O. V. Dolgov; J. Kortus; A. Golubov; A. B. Kuzmenko; D. van der Marel Superconductivity in MgB2: Clean or Dirty? Journal Article Physical Review Letters, 89 (10), 2002. @article{MAJDKGKM02, title = {Superconductivity in MgB2: Clean or Dirty?}, author = {I.I. Mazin and O. K. Andersen and O. Jepsen and O. V. Dolgov and J. Kortus and A. Golubov and A. B. Kuzmenko and D. van der Marel}, year = {2002}, date = {2002-01-01}, journal = {Physical Review Letters}, volume = {89}, number = {10}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
H. J. A. Molegraaf; C. N. Presura; D. van der Marel; P. H. Kes; M. Li Superconductivity-induced transfer of in-plane spectral weight in Bi2Sr2CaCu2O8+delta. Journal Article Science (New York, N.Y.), 295 (5563), pp. 2239–41, 2002. @article{MPVKL02, title = {Superconductivity-induced transfer of in-plane spectral weight in Bi2Sr2CaCu2O8+delta.}, author = {H. J. A. Molegraaf and C. N. Presura and D. van der Marel and P. H. Kes and M. Li}, year = {2002}, date = {2002-01-01}, journal = {Science (New York, N.Y.)}, volume = {295}, number = {5563}, pages = {2239--41}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. A. Tsvetkov; F. P. Mena; Y. Ren; I. S. Elfimov; P.H.M. van Loosdrecht; D. van der Marel; A.A. Nugroho; A. A. Menovsky; G. A. Sawatzky Optical and magneto-optical study of orbital and spin ordering transitions in YVO3 Journal Article Physica B: Condensed Matter, 312-313 , pp. 783–784, 2002. @article{TMRELMNMS02, title = {Optical and magneto-optical study of orbital and spin ordering transitions in YVO3}, author = {A. A. Tsvetkov and F. P. Mena and Y. Ren and I. S. Elfimov and P.H.M. van Loosdrecht and D. van der Marel and A.A. Nugroho and A. A. Menovsky and G. A. Sawatzky}, year = {2002}, date = {2002-01-01}, journal = {Physica B: Condensed Matter}, volume = {312-313}, pages = {783--784}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; A. Leggett; J. Loram; J. R. Kirtley Condensation energy and high-Tc superconductivity Journal Article Physical Review B, 66 (14), 2002. @article{MLLK02, title = {Condensation energy and high-Tc superconductivity}, author = {D. van der Marel and A. Leggett and J. Loram and J. R. Kirtley}, year = {2002}, date = {2002-01-01}, journal = {Physical Review B}, volume = {66}, number = {14}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Diana Dulic A Study of the c-axis Excitations in Cuprate Superconductors PhD Thesis 2001. @phdthesis{Dulic2001, title = {A Study of the c-axis Excitations in Cuprate Superconductors}, author = {Diana Dulic}, year = {2001}, date = {2001-01-29}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
A. B. Kuzmenko; D. van der Marel; P. J. M. van Bentum; E. A. Tishchenko; C. N. Presura; A. Bush Infrared spectroscopic study of CuO: Signatures of strong spin-phonon interaction and structural distortion Journal Article Physical Review B, 63 (9), 2001. @article{KMBTPB01, title = {Infrared spectroscopic study of CuO: Signatures of strong spin-phonon interaction and structural distortion}, author = {A. B. Kuzmenko and D. van der Marel and P. J. M. van Bentum and E. A. Tishchenko and C. N. Presura and A. Bush}, year = {2001}, date = {2001-01-01}, journal = {Physical Review B}, volume = {63}, number = {9}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. Pimenov; A. Loidl; D. Dulic; D. van der Marel; I. Sutjahja; A. A. Menovsky Magnetic Field Dependence of the Transverse Plasmon in SmLa0.8Sr0.2CuO4-$delta$ Journal Article Physical Review Letters, 87 (17), 2001. @article{PLDMSM01, title = {Magnetic Field Dependence of the Transverse Plasmon in SmLa0.8Sr0.2CuO4-$delta$}, author = {A. Pimenov and A. Loidl and D. Dulic and D. van der Marel and I. Sutjahja and A. A. Menovsky}, year = {2001}, date = {2001-01-01}, journal = {Physical Review Letters}, volume = {87}, number = {17}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; A. A. Tsvetkov Transverse-optical Josephson plasmons: Equations of motion Journal Article Physical Review B, 64 (2), 2001. @article{MT01, title = {Transverse-optical Josephson plasmons: Equations of motion}, author = {D. van der Marel and A. A. Tsvetkov}, year = {2001}, date = {2001-01-01}, journal = {Physical Review B}, volume = {64}, number = {2}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. W. van derEb; A. B. Kuzmenko; D. van der Marel Infrared and Optical Spectroscopy of $alpha$- and $gamma$-Phase Cerium Journal Article Physical Review Letters, 86 (15), pp. 3407–3410, 2001. @article{EKM01, title = {Infrared and Optical Spectroscopy of $alpha$- and $gamma$-Phase Cerium}, author = {J. W. van derEb and A. B. Kuzmenko and D. van der Marel}, year = {2001}, date = {2001-01-01}, journal = {Physical Review Letters}, volume = {86}, number = {15}, pages = {3407--3410}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. Basov; C. C. Homes; E. Singley; M. Strongin; T. Timusk; G. Blumberg; D. van der Marel Unconventional energetics of the pseudogap state and superconducting state in high-Tc cuprates Journal Article Physical Review B, 63 (13), 2001. @article{BHSSTBM01, title = {Unconventional energetics of the pseudogap state and superconducting state in high-Tc cuprates}, author = {D. Basov and C. C. Homes and E. Singley and M. Strongin and T. Timusk and G. Blumberg and D. van der Marel}, year = {2001}, date = {2001-01-01}, journal = {Physical Review B}, volume = {63}, number = {13}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. Dulic; A. Pimenov; D. van der Marel; D. Broun; S. Kamal; W. Hardy; A. A. Tsvetkov; I. Sutjaha; R. Liang; A. A. Menovsky; A. Loidl; S. Saxena Observation of the Transverse Optical Plasmon in SmLa0.8Sr0.2CuO4-$delta$ Journal Article Physical Review Letters, 86 (18), pp. 4144–4147, 2001. @article{DPMBKHTSLMLS01, title = {Observation of the Transverse Optical Plasmon in SmLa0.8Sr0.2CuO4-$delta$}, author = {D. Dulic and A. Pimenov and D. van der Marel and D. Broun and S. Kamal and W. Hardy and A. A. Tsvetkov and I. Sutjaha and R. Liang and A. A. Menovsky and A. Loidl and S. Saxena}, year = {2001}, date = {2001-01-01}, journal = {Physical Review Letters}, volume = {86}, number = {18}, pages = {4144--4147}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
B. P. Gorshunov; C. A. Kuntscher; P. Haas; M. Dressel; F. P. Mena; A. B. Kuzmenko; D. van der Marel; T. Muranaka; J. Akimitsu Optical measurements of the superconducting gap in MgB 2 Journal Article The European Physical Journal B, 21 (2), pp. 159–161, 2001. @article{GKHDMKMMA01, title = {Optical measurements of the superconducting gap in MgB 2}, author = {B. P. Gorshunov and C. A. Kuntscher and P. Haas and M. Dressel and F. P. Mena and A. B. Kuzmenko and D. van der Marel and T. Muranaka and J. Akimitsu}, year = {2001}, date = {2001-01-01}, journal = {The European Physical Journal B}, volume = {21}, number = {2}, pages = {159--161}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. B. Kuzmenko; D. van der Marel; P. J. M. van Bentum; E. A. Tishchenko; C. N. Presura; A. Bush Phonon anomalies versus magnetic ordering in CuO Journal Article Physica B: Condensed Matter, 284-288 , pp. 1396–1397, 2000. @article{KMBTPB00, title = {Phonon anomalies versus magnetic ordering in CuO}, author = {A. B. Kuzmenko and D. van der Marel and P. J. M. van Bentum and E. A. Tishchenko and C. N. Presura and A. Bush}, year = {2000}, date = {2000-01-01}, journal = {Physica B: Condensed Matter}, volume = {284-288}, pages = {1396--1397}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
C. N. Presura; D. van der Marel; A. Damascelli; R. Kremer Low-temperature ellipsometry of $alpha$?-NaV2O5 Journal Article Physical Review B, 61 (23), pp. 15762–15765, 2000. @article{PMDK00, title = {Low-temperature ellipsometry of $alpha$?-NaV2O5}, author = {C. N. Presura and D. van der Marel and A. Damascelli and R. Kremer}, year = {2000}, date = {2000-01-01}, journal = {Physical Review B}, volume = {61}, number = {23}, pages = {15762--15765}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
C. N. Presura; D. van der Marel; M. Dischner; C. Geibel; R. Kremer Optical properties and electronic structure of $alpha$?-Na1-xCaxV2O5 Journal Article Physical Review B, 62 (24), pp. 16522–16527, 2000. @article{PMDGK00, title = {Optical properties and electronic structure of $alpha$?-Na1-xCaxV2O5}, author = {C. N. Presura and D. van der Marel and M. Dischner and C. Geibel and R. Kremer}, year = {2000}, date = {2000-01-01}, journal = {Physical Review B}, volume = {62}, number = {24}, pages = {16522--16527}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
V. Zelezny; S. Tajima; T. Motohashi; J. Shimoyama; K. Kishio; D. van der Marel C-Axis Infrared Spectra of Bilayer High Tc Cuprates: The Effect of Intrabilayer Josephson Coupling Inproceedings Proceedings of the 12th International Symposium on Superconductivity (ISS &amp;quot;99), pp. 41–44, 2000. @inproceedings{ZTMSKM00, title = {C-Axis Infrared Spectra of Bilayer High Tc Cuprates: The Effect of Intrabilayer Josephson Coupling}, author = {V. Zelezny and S. Tajima and T. Motohashi and J. Shimoyama and K. Kishio and D. van der Marel}, year = {2000}, date = {2000-01-01}, booktitle = {Proceedings of the 12th International Symposium on Superconductivity (ISS &amp;quot;99)}, pages = {41--44}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
D. van der Marel Optical signatures of electron correlations in the cuprates . Miscellaneous 2000. @misc{Mar00, title = {Optical signatures of electron correlations in the cuprates .}, author = {D. van der Marel}, year = {2000}, date = {2000-01-01}, keywords = {}, pubstate = {published}, tppubtype = {misc} } |
D. van der Marel; A. A. Tsvetkov; M. Grueninger; D. Dulic; H. J. A. Molegraaf C-axis optical properties of high Tc cuprates Journal Article Physica C: Superconductivity, 341-348 , pp. 1531–1534, 2000. @article{MTGDM00, title = {C-axis optical properties of high Tc cuprates}, author = {D. van der Marel and A. A. Tsvetkov and M. Grueninger and D. Dulic and H. J. A. Molegraaf}, year = {2000}, date = {2000-01-01}, journal = {Physica C: Superconductivity}, volume = {341-348}, pages = {1531--1534}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. Damascelli; D. van der Marel; G. Dhalenne; A. Revcolevschi Optical spectroscopy of pure and doped CuGeO3 Journal Article Physical Review B, 61 (18), pp. 12063–12074, 2000. @article{DMDR00, title = {Optical spectroscopy of pure and doped CuGeO3}, author = {A. Damascelli and D. van der Marel and G. Dhalenne and A. Revcolevschi}, year = {2000}, date = {2000-01-01}, journal = {Physical Review B}, volume = {61}, number = {18}, pages = {12063--12074}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. Damascelli; C. N. Presura; D. van der Marel; J. Jegoudez; A. Revcolevschi Optical spectroscopic study of the interplay of spin and charge in $alpha$?-NaV2O5 Journal Article Physical Review B, 61 (4), pp. 2535–2552, 2000. @article{DPMJR00, title = {Optical spectroscopic study of the interplay of spin and charge in $alpha$?-NaV2O5}, author = {A. Damascelli and C. N. Presura and D. van der Marel and J. Jegoudez and A. Revcolevschi}, year = {2000}, date = {2000-01-01}, journal = {Physical Review B}, volume = {61}, number = {4}, pages = {2535--2552}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
M. Gr"uninger; D. van der Marel; A. Damascelli; A. Erb; T. Nunner; T. Kopp Midinfrared absorption in YBa2Cu3O6: Evidence for a failure of spin-wave theory for spin 12 in two dimensions Journal Article Physical Review B, 62 (18), pp. 12422–12426, 2000. @article{GMDENK00, title = {Midinfrared absorption in YBa2Cu3O6: Evidence for a failure of spin-wave theory for spin 12 in two dimensions}, author = {M. Gr"uninger and D. van der Marel and A. Damascelli and A. Erb and T. Nunner and T. Kopp}, year = {2000}, date = {2000-01-01}, journal = {Physical Review B}, volume = {62}, number = {18}, pages = {12422--12426}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
M. Gr"uninger; D. van der Marel; A. A. Tsvetkov; A. Erb Observation of Out-of-Phase Bilayer Plasmons in YBa2Cu3O7-$delta$ Journal Article Physical Review Letters, 84 (7), pp. 1575–1578, 2000. @article{GMTE00, title = {Observation of Out-of-Phase Bilayer Plasmons in YBa2Cu3O7-$delta$}, author = {M. Gr"uninger and D. van der Marel and A. A. Tsvetkov and A. Erb}, year = {2000}, date = {2000-01-01}, journal = {Physical Review Letters}, volume = {84}, number = {7}, pages = {1575--1578}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Markus U. Grüninger Cerium, one of natures purest puzzles PhD Thesis 1999. @phdthesis{Grüninger1999, title = {Cerium, one of natures purest puzzles}, author = {Markus U. Grüninger}, url = {http://dqmp.unige.ch/vandermarel/wp-content/uploads/2016/05/thesis_gruninger.pdf}, year = {1999}, date = {1999-09-17}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
Andrea Damascelli Optical Spectroscopy of Quantum Spin Systems. PhD Thesis 1999. @phdthesis{Damascelli1999, title = {Optical Spectroscopy of Quantum Spin Systems.}, author = {Andrea Damascelli}, url = {http://dqmp.unige.ch/vandermarel/wp-content/uploads/2016/05/thesis_damascelli.pdf}, year = {1999}, date = {1999-03-19}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
A. A. Tsvetkov; D. Dulic; D. van der Marel; A. Damascelli; G. A. Kaljushnaia; J. I. Gorina; N. Senturina; N. Kolesnikov; Z. F. Ren; J. H. Wang; A. A. Menovsky; T. T. M. Palstra Systematics of c-axis phonons in the thallium- and bismuth-based cuprate superconductors Journal Article Physical Review B, 60 (18), pp. 13196–13205, 1999. @article{TDMDKGSKRWMP99, title = {Systematics of c-axis phonons in the thallium- and bismuth-based cuprate superconductors}, author = {A. A. Tsvetkov and D. Dulic and D. van der Marel and A. Damascelli and G. A. Kaljushnaia and J. I. Gorina and N. Senturina and N. Kolesnikov and Z. F. Ren and J. H. Wang and A. A. Menovsky and T. T. M. Palstra}, year = {1999}, date = {1999-01-01}, journal = {Physical Review B}, volume = {60}, number = {18}, pages = {13196--13205}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
V. Zelezny; S. Tajima; T. Motohashi; J. Shimoyama; K. Kishio; D. van der Marel Origin of Anomalous Bump at Low Temperatures in the c-Axis Optical Conductivity of High-Tc Cuprates Journal Article Journal of Low Temperature Physics, 117 (5-6), pp. 1019–1023, 1999. @article{ZTMSKM99, title = {Origin of Anomalous Bump at Low Temperatures in the c-Axis Optical Conductivity of High-Tc Cuprates}, author = {V. Zelezny and S. Tajima and T. Motohashi and J. Shimoyama and K. Kishio and D. van der Marel}, year = {1999}, date = {1999-01-01}, journal = {Journal of Low Temperature Physics}, volume = {117}, number = {5-6}, pages = {1019--1023}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel Anisotropy of the optical conductivity of high-Tc cuprates Journal Article Physical Review B, 60 (2), pp. R765–R768, 1999. @article{Mar99, title = {Anisotropy of the optical conductivity of high-Tc cuprates}, author = {D. van der Marel}, year = {1999}, date = {1999-01-01}, journal = {Physical Review B}, volume = {60}, number = {2}, pages = {R765--R768}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel Hoge Tc supergeleiders blijven raadselachting, Journal Article Nederlands Tijdschrift voor Natuurkunde, 65 , pp. 206–207, 1999. @article{Mar99a, title = {Hoge Tc supergeleiders blijven raadselachting,}, author = {D. van der Marel}, year = {1999}, date = {1999-01-01}, journal = {Nederlands Tijdschrift voor Natuurkunde}, volume = {65}, pages = {206--207}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. Damascelli; D. van der Marel; J. Jegoudez; G. Dhalenne; A. Revcolevschi The symmetry problem in $alpha$?-NaV2O5 Journal Article Physica B: Condensed Matter, 259-261 (1-2), pp. 978–980, 1999. @article{DMJDR99, title = {The symmetry problem in $alpha$?-NaV2O5}, author = {A. Damascelli and D. van der Marel and J. Jegoudez and G. Dhalenne and A. Revcolevschi}, year = {1999}, date = {1999-01-01}, journal = {Physica B: Condensed Matter}, volume = {259-261}, number = {1-2}, pages = {978--980}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. Dulic; D. van der Marel; A. A. Tsvetkov; W. Hardy; Z. F. Ren; J. H. Wang; B. Willemsen c-axis penetration depth and interlayer conductivity in the thallium-based cuprate superconductors Journal Article Physical Review B, 60 (22), pp. R15051–R15054, 1999. @article{DMTHRWW99, title = {c-axis penetration depth and interlayer conductivity in the thallium-based cuprate superconductors}, author = {D. Dulic and D. van der Marel and A. A. Tsvetkov and W. Hardy and Z. F. Ren and J. H. Wang and B. Willemsen}, year = {1999}, date = {1999-01-01}, journal = {Physical Review B}, volume = {60}, number = {22}, pages = {R15051--R15054}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. L. Feng; W. J. Zheng; K. M. Shen; D. H. Lu; F. Ronning; J. Shimoyama; K. Kishio; G. Gu; D. van der Marel; Z. X. Shen Fermi Surface of Bi2212: a Systematic Revisit and Identification of Almost Perfectly Nested Fermi Surface Segments Journal Article Condmat:arXiv, pp. 5, 1999. @article{FZSLRSKGVS99, title = {Fermi Surface of Bi2212: a Systematic Revisit and Identification of Almost Perfectly Nested Fermi Surface Segments}, author = {D. L. Feng and W. J. Zheng and K. M. Shen and D. H. Lu and F. Ronning and J. Shimoyama and K. Kishio and G. Gu and D. van der Marel and Z. X. Shen}, year = {1999}, date = {1999-01-01}, journal = {Condmat:arXiv}, pages = {5}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
M. Gr"uninger; D. van der Marel; A. Damascelli; A. Zibold; H. P. Geserich; A. Erb; M. Klaser; Th. Wolf; T. Nunner; T. Kopp Charged magnons and magneto-elastic polarons in the mid-infrared spectrum of YBa2Cu3O6 Journal Article Physica C: Superconductivity, 317-318 (1-2), pp. 286–291, 1999. @article{GMDZGEKWNK99, title = {Charged magnons and magneto-elastic polarons in the mid-infrared spectrum of YBa2Cu3O6}, author = {M. Gr"uninger and D. van der Marel and A. Damascelli and A. Zibold and H. P. Geserich and A. Erb and M. Klaser and Th. Wolf and T. Nunner and T. Kopp}, year = {1999}, date = {1999-01-01}, journal = {Physica C: Superconductivity}, volume = {317-318}, number = {1-2}, pages = {286--291}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Herpertap S. Somal Polarized Angle Resolved Infrared Spectroscopy of high Temperature Superconductors. PhD Thesis 1998. @phdthesis{Somal1998, title = {Polarized Angle Resolved Infrared Spectroscopy of high Temperature Superconductors.}, author = {Herpertap S. Somal}, url = {http://dqmp.unige.ch/vandermarel/wp-content/uploads/2016/05/thesis_somal.pdf}, year = {1998}, date = {1998-04-06}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
A. V. Pronin; B. P. Gorshunov; A. A. Volkov; H. S. Somal; D. van der Marel; B. J. Feenstra; Y. Jaccard; J. P. Locquet Anomalous millimeter-wave absorption in the superconducting phase of La2?x SrxCuO4 Journal Article Journal of Experimental and Theoretical Physics Letters, 68 (5), pp. 432–436, 1998. @article{PGVSMFJL98, title = {Anomalous millimeter-wave absorption in the superconducting phase of La2?x SrxCuO4}, author = {A. V. Pronin and B. P. Gorshunov and A. A. Volkov and H. S. Somal and D. van der Marel and B. J. Feenstra and Y. Jaccard and J. P. Locquet}, year = {1998}, date = {1998-01-01}, journal = {Journal of Experimental and Theoretical Physics Letters}, volume = {68}, number = {5}, pages = {432--436}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. A. Tsvetkov; D. van der Marel; D. Dulic; H. J. A. Molegraaf; N. N. Koleshnikov; B. Willemsen; Z. F. Ren Interlayer tunnelling mechanism: experimental test of single layer compounds Inproceedings Proceedings of the SPIE Meeting, Superconducting Superlattices II: Native and Artificial, San Diego, USA, 1998. @inproceedings{TMDMKWR98, title = {Interlayer tunnelling mechanism: experimental test of single layer compounds}, author = {A. A. Tsvetkov and D. van der Marel and D. Dulic and H. J. A. Molegraaf and N. N. Koleshnikov and B. Willemsen and Z. F. Ren}, year = {1998}, date = {1998-01-01}, booktitle = {Proceedings of the SPIE Meeting, Superconducting Superlattices II: Native and Artificial}, address = {San Diego, USA}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
A. A. Tsvetkov; D. van der Marel; K. A. Moler; J. R. Kirtley; J. L. deBoer; A. Meetsma; Z. F. Ren; N. N. Koleshnikov; D. Dulic; A. Damascelli; M. Grueninger; J. Sch"utzmann; J. W. van derEb; H. S. Somal; J. H. Wang Global and local measures of the intrinsic Josephson coupling in Tl2Ba2CuO6 as a test of the interlayer tunnelling model Journal Article Nature, 395 , pp. 360–362, 1998. @article{TMMKBMRKDDGSESW98, title = {Global and local measures of the intrinsic Josephson coupling in Tl2Ba2CuO6 as a test of the interlayer tunnelling model}, author = {A. A. Tsvetkov and D. van der Marel and K. A. Moler and J. R. Kirtley and J. L. deBoer and A. Meetsma and Z. F. Ren and N. N. Koleshnikov and D. Dulic and A. Damascelli and M. Grueninger and J. Sch"utzmann and J. W. van derEb and H. S. Somal and J. H. Wang}, year = {1998}, date = {1998-01-01}, journal = {Nature}, volume = {395}, pages = {360--362}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; A. Damascelli; K. Schulte; A. A. Menovsky Spin, charge, and bonding in transition metal mono-silicides Journal Article Physica B: Condensed Matter, 244 , pp. 138–147, 1998. @article{MDSM98, title = {Spin, charge, and bonding in transition metal mono-silicides}, author = {D. van der Marel and A. Damascelli and K. Schulte and A. A. Menovsky}, year = {1998}, date = {1998-01-01}, journal = {Physica B: Condensed Matter}, volume = {244}, pages = {138--147}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. Damascelli; D. van der Marel; M. Gr"uninger; C. N. Presura; T. T. M. Palstra; J. Jegoudez; A. Revcolevschi Direct Two-Magnon Optical Absorption in $alpha$?-NaV2O5: “Charged” Magnons Journal Article Physical Review Letters, 81 (4), pp. 918–921, 1998. @article{DMGPPJR98, title = {Direct Two-Magnon Optical Absorption in $alpha$?-NaV2O5: “Charged” Magnons}, author = {A. Damascelli and D. van der Marel and M. Gr"uninger and C. N. Presura and T. T. M. Palstra and J. Jegoudez and A. Revcolevschi}, year = {1998}, date = {1998-01-01}, journal = {Physical Review Letters}, volume = {81}, number = {4}, pages = {918--921}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. Damascelli; D. van der Marel; F. Parmigiani; G. Dhalenne; A. Revcolevschi Infrared reflectivity of pure and doped CuGeO3 Journal Article Physica B: Condensed Matter, 244 , pp. 114–120, 1998. @article{DMPDR98, title = {Infrared reflectivity of pure and doped CuGeO3}, author = {A. Damascelli and D. van der Marel and F. Parmigiani and G. Dhalenne and A. Revcolevschi}, year = {1998}, date = {1998-01-01}, journal = {Physica B: Condensed Matter}, volume = {244}, pages = {114--120}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
B. P. Gorshunov; A. V. Pronin; A. A. Volkov; H. S. Somal; D. van der Marel; B. J. Feenstra; Y. Jaccard; J. P. Locquet Dynamical conductivity of an MBE-grown La1.84Sr0.16CuO4 thin film at frequencies from 5 to 36 cm?1 Journal Article Physica B: Condensed Matter, 244 , pp. 15–21, 1998. @article{GPVSMFJL98, title = {Dynamical conductivity of an MBE-grown La1.84Sr0.16CuO4 thin film at frequencies from 5 to 36 cm?1}, author = {B. P. Gorshunov and A. V. Pronin and A. A. Volkov and H. S. Somal and D. van der Marel and B. J. Feenstra and Y. Jaccard and J. P. Locquet}, year = {1998}, date = {1998-01-01}, journal = {Physica B: Condensed Matter}, volume = {244}, pages = {15--21}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
M. Gr"uninger; D. van der Marel; H. P. Geserich; Th. Wolf; A. Erb; T. Kopp Infrared spectroscopy on Y1?xRExBa2Cu3?yZnyO6 (RE _ Pr, Gd Journal Article Physica B: Condensed Matter, 244 , pp. 60–65, 1998. @article{GMGWEK98, title = {Infrared spectroscopy on Y1?xRExBa2Cu3?yZnyO6 (RE _ Pr, Gd}, author = {M. Gr"uninger and D. van der Marel and H. P. Geserich and Th. Wolf and A. Erb and T. Kopp}, year = {1998}, date = {1998-01-01}, journal = {Physica B: Condensed Matter}, volume = {244}, pages = {60--65}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
B. Johan Feenstra Low Energy Electrodynamics of High Tc Superconductors. PhD Thesis 1997. @phdthesis{Feenstra1997, title = {Low Energy Electrodynamics of High Tc Superconductors.}, author = {B. Johan Feenstra}, url = {http://dqmp.unige.ch/vandermarel/wp-content/uploads/2016/05/thesis_feenstra.pdf}, year = {1997}, date = {1997-10-17}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
Beom-hoan O; J.T. Markert; D. van der Marel c-Axis infrared properties of Sm2?xCexCuO4-$delta$ Journal Article Physica C: Superconductivity, 282-287 , pp. 1023–1024, 1997. @article{OMM97, title = {c-Axis infrared properties of Sm2?xCexCuO4-$delta$}, author = {Beom-hoan O and J.T. Markert and D. van der Marel}, year = {1997}, date = {1997-01-01}, journal = {Physica C: Superconductivity}, volume = {282-287}, pages = {1023--1024}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. Sch"utzmann; H. S. Somal; A. A. Tsvetkov; D. van der Marel; G. E. J. Koops; N. N. Koleshnikov; Z. F. Ren; J. H. Wang; E. Br"uck; A. A. Menovsky Experimental test of the interlayer pairing models for high-Tc superconductivity using grazing-incidence infrared reflectometry Journal Article Physical Review B, 55 (17), pp. 11118–11121, 1997. @article{SSTMKKRWBM97, title = {Experimental test of the interlayer pairing models for high-Tc superconductivity using grazing-incidence infrared reflectometry}, author = {J. Sch"utzmann and H. S. Somal and A. A. Tsvetkov and D. van der Marel and G. E. J. Koops and N. N. Koleshnikov and Z. F. Ren and J. H. Wang and E. Br"uck and A. A. Menovsky}, year = {1997}, date = {1997-01-01}, journal = {Physical Review B}, volume = {55}, number = {17}, pages = {11118--11121}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. A. Tsvetkov; J. Sch"utzmann; J. I. Gorina; G. A. Kaljushnaia; D. van der Marel In-plane optical response of Bi2Sr2CuO6 Journal Article Physical Review B, 55 (21), pp. 14152–14155, 1997. @article{TSGKM97, title = {In-plane optical response of Bi2Sr2CuO6}, author = {A. A. Tsvetkov and J. Sch"utzmann and J. I. Gorina and G. A. Kaljushnaia and D. van der Marel}, year = {1997}, date = {1997-01-01}, journal = {Physical Review B}, volume = {55}, number = {21}, pages = {14152--14155}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. Damascelli; D. van der Marel; F. Parmigiani; G. Dhalenne; A. Revcolevschi Infrared signatures of the spin-Peierls transition in CuGeO3 Journal Article Physical Review B, 56 (18), pp. R11373–R11376, 1997. @article{DMPDR97, title = {Infrared signatures of the spin-Peierls transition in CuGeO3}, author = {A. Damascelli and D. van der Marel and F. Parmigiani and G. Dhalenne and A. Revcolevschi}, year = {1997}, date = {1997-01-01}, journal = {Physical Review B}, volume = {56}, number = {18}, pages = {R11373--R11376}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. Damascelli; K. Schulte; D. van der Marel; M. F"ath; A. A. Menovsky Optical phonons in the reflectivity spectrum of FeSi Journal Article Physica B: Condensed Matter, 230-232 , pp. 787–789, 1997. @article{DSMFM97, title = {Optical phonons in the reflectivity spectrum of FeSi}, author = {A. Damascelli and K. Schulte and D. van der Marel and M. F"ath and A. A. Menovsky}, year = {1997}, date = {1997-01-01}, journal = {Physica B: Condensed Matter}, volume = {230-232}, pages = {787--789}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. Damascelli; K. Schulte; D. van der Marel; A. A. Menovsky Infrared spectroscopic study of phonons coupled to charge excitations in FeSi Journal Article Physical Review B, 55 (8), pp. R4863–R4866, 1997. @article{DSMM97, title = {Infrared spectroscopic study of phonons coupled to charge excitations in FeSi}, author = {A. Damascelli and K. Schulte and D. van der Marel and A. A. Menovsky}, year = {1997}, date = {1997-01-01}, journal = {Physical Review B}, volume = {55}, number = {8}, pages = {R4863--R4866}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
B. J. Feenstra; F.C. Klaassen; D. van der Marel; Z. Barber; R. Perez Pinaya; M. Decroux Penetration depth and conductivity of NbN and DyBa2Cu3O7?$delta$ thin films measured by mm-wave transmission Journal Article Physica C: Superconductivity, 278 (3-4), pp. 213–222, 1997. @article{FKMBD97, title = {Penetration depth and conductivity of NbN and DyBa2Cu3O7?$delta$ thin films measured by mm-wave transmission}, author = {B. J. Feenstra and F.C. Klaassen and D. van der Marel and Z. Barber and R. Perez Pinaya and M. Decroux}, year = {1997}, date = {1997-01-01}, journal = {Physica C: Superconductivity}, volume = {278}, number = {3-4}, pages = {213--222}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
B. J. Feenstra; J. Sch"utzmann; D. van der Marel; R. Përez Pinaya; M. Decroux Nonequilibrium Superconductivity and Quasiparticle Dynamics Studied by Photoinduced Activation of mm-Wave Absorption Journal Article Physical Review Letters, 79 (24), pp. 4890–4893, 1997. @article{FSMD97, title = {Nonequilibrium Superconductivity and Quasiparticle Dynamics Studied by Photoinduced Activation of mm-Wave Absorption}, author = {B. J. Feenstra and J. Sch"utzmann and D. van der Marel and R. Përez Pinaya and M. Decroux}, year = {1997}, date = {1997-01-01}, journal = {Physical Review Letters}, volume = {79}, number = {24}, pages = {4890--4893}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. Khomskii; D. van der Marel Hoe goed begrijpen wij hoge-temperatuursupergeleiding? Journal Article Nederlands Tijdschrift voor Natuurkunde, 62 , pp. 39–42, 1996. @article{KM96, title = {Hoe goed begrijpen wij hoge-temperatuursupergeleiding?}, author = {D. Khomskii and D. van der Marel}, year = {1996}, date = {1996-01-01}, journal = {Nederlands Tijdschrift voor Natuurkunde}, volume = {62}, pages = {39--42}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. Sch"utzmann; H. S. Somal; J. W. van derEb; D. van der Marel; A. A. Tsvetkov; R. L. Greene; N. N. Koleshnikov; V. H. M. Duijn; N. T. Hien; A. A. Menovsky c-Acis excitations in high-Tc superconductors detected by grazing incidence reflectivity measurements Journal Article Czech. J. Phys., 46 (S2), pp. 1129–1130, 1996. @article{SSEMTGKDHM96, title = {c-Acis excitations in high-Tc superconductors detected by grazing incidence reflectivity measurements}, author = {J. Sch"utzmann and H. S. Somal and J. W. van derEb and D. van der Marel and A. A. Tsvetkov and R. L. Greene and N. N. Koleshnikov and V. H. M. Duijn and N. T. Hien and A. A. Menovsky}, year = {1996}, date = {1996-01-01}, journal = {Czech. J. Phys.}, volume = {46}, number = {S2}, pages = {1129--1130}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
H. S. Somal; B. J. Feenstra; J. Sch"utzmann; Jae Hoon Kim; Z. Barber; V. H. M. Duijn; N. T. Hien; A. A. Menovsky; Mario Palumbo; D. van der Marel Grazing Incidence Infrared Reflectivity of La1.85Sr0.15CuO4 and NbN Journal Article Physical Review Letters, 76 (9), pp. 1525–1528, 1996. @article{SFSBDHMPM96, title = {Grazing Incidence Infrared Reflectivity of La1.85Sr0.15CuO4 and NbN}, author = {H. S. Somal and B. J. Feenstra and J. Sch"utzmann and Jae Hoon Kim and Z. Barber and V. H. M. Duijn and N. T. Hien and A. A. Menovsky and Mario Palumbo and D. van der Marel}, year = {1996}, date = {1996-01-01}, journal = {Physical Review Letters}, volume = {76}, number = {9}, pages = {1525--1528}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; J. Sch"utzmann; H. S. Somal; J. W. van derEb Electrodynamical Properties of High Tc Superconductors Studied with Polarized Angle Resolved Infrared Spectroscopy Inproceedings Proceedings of 10th Anniversary HTS Workshop on Physics, Materials and Applications, pp. 6, World Scientific Publishers, Houston, U.S.A., 1996. @inproceedings{MSSE96, title = {Electrodynamical Properties of High Tc Superconductors Studied with Polarized Angle Resolved Infrared Spectroscopy}, author = {D. van der Marel and J. Sch"utzmann and H. S. Somal and J. W. van derEb}, year = {1996}, date = {1996-01-01}, booktitle = {Proceedings of 10th Anniversary HTS Workshop on Physics, Materials and Applications}, pages = {6}, publisher = {World Scientific Publishers}, address = {Houston, U.S.A.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
D. van der Marel; A. A. Tsvetkov Transverse optical plasmons in layered superconductors Journal Article Czech. J. Phys., 46 (S6), pp. 3165–3168, 1996. @article{MT96, title = {Transverse optical plasmons in layered superconductors}, author = {D. van der Marel and A. A. Tsvetkov}, year = {1996}, date = {1996-01-01}, journal = {Czech. J. Phys.}, volume = {46}, number = {S6}, pages = {3165--3168}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
B. J. Feenstra; F.C. Klaassen; D. van der Marel; Z. Barber; R. Perez Pinaya; M. Decroux Characterization of Superconducting Thin Films using Mm-Wave Tranmission. Inproceedings International Conference on Millimeter and Submillimeter Waves and Applications III, pp. 480, SPIE proceedings, Denver, Colorado, 1996. @inproceedings{FKMBD96, title = {Characterization of Superconducting Thin Films using Mm-Wave Tranmission.}, author = {B. J. Feenstra and F.C. Klaassen and D. van der Marel and Z. Barber and R. Perez Pinaya and M. Decroux}, year = {1996}, date = {1996-01-01}, booktitle = {International Conference on Millimeter and Submillimeter Waves and Applications III}, volume = {2842}, pages = {480}, publisher = {SPIE proceedings}, address = {Denver, Colorado}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
M. Grueninger; D. van der Marel; P. J. M. van Bentum; A. Erb; H. P. Geserich; T. Kopp Far- and mid-infrared spectrum of YBa2Cu3O6.0 in high magnetic fields Journal Article Journal of Low Temperature Physics, 105 (3-4), pp. 389–394, 1996. @article{GMBEGK96, title = {Far- and mid-infrared spectrum of YBa2Cu3O6.0 in high magnetic fields}, author = {M. Grueninger and D. van der Marel and P. J. M. van Bentum and A. Erb and H. P. Geserich and T. Kopp}, year = {1996}, date = {1996-01-01}, journal = {Journal of Low Temperature Physics}, volume = {105}, number = {3-4}, pages = {389--394}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
M. Grueninger; D. van der Marel; P. J. M. van Bentum; A. Erb; Th. Wolf; T. Kopp Probing the Mid-Infrared Spectrum of YBa2Cu3O6.0 with High Magnetic Fields and Zinc Doping Journal Article Czech. J. Phys., 46-S2 , pp. 1127, 1996. @article{GMBEWK96, title = {Probing the Mid-Infrared Spectrum of YBa2Cu3O6.0 with High Magnetic Fields and Zinc Doping}, author = {M. Grueninger and D. van der Marel and P. J. M. van Bentum and A. Erb and Th. Wolf and T. Kopp}, year = {1996}, date = {1996-01-01}, journal = {Czech. J. Phys.}, volume = {46-S2}, pages = {1127}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Neng Y. Chen Normal-State Properties and Laser Deposition of YBa2Cu3O7-d Superconductor Thin Films. PhD Thesis 1995. @phdthesis{Chen1995, title = {Normal-State Properties and Laser Deposition of YBa2Cu3O7-d Superconductor Thin Films.}, author = {Neng Y. Chen}, year = {1995}, date = {1995-02-13}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
G. Rietveld; S.J. Collocott; R. Driver; D. van der Marel Doping dependence of the chemical potential in cuprate high-Tc superconductors II. (Bi, Pb)2Sr2Ca2Cu3O10+$delta$ Journal Article Physica C: Superconductivity, 241 (3-4), pp. 273–278, 1995. @article{RCDM95, title = {Doping dependence of the chemical potential in cuprate high-Tc superconductors II. (Bi, Pb)2Sr2Ca2Cu3O10+$delta$}, author = {G. Rietveld and S.J. Collocott and R. Driver and D. van der Marel}, year = {1995}, date = {1995-01-01}, journal = {Physica C: Superconductivity}, volume = {241}, number = {3-4}, pages = {273--278}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
G. Rietveld; M. Glastra; D. van der Marel Doping Dependence of the Chemical Potential in Cuprate High-$T_ackslash rm c$ Superconductors I: La$_2-x$Sr$_x$CuO$_4$ Journal Article Physica C: Superconductivity, 241 , pp. 257–272, 1995. @article{RGM95, title = {Doping Dependence of the Chemical Potential in Cuprate High-$T_ackslash rm c$ Superconductors I: La$_2-x$Sr$_x$CuO$_4$}, author = {G. Rietveld and M. Glastra and D. van der Marel}, year = {1995}, date = {1995-01-01}, journal = {Physica C: Superconductivity}, volume = {241}, pages = {257--272}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel Collective modes of spin, density, phase, and amplitude in exotic superconductors Journal Article Physical Review B, 51 (2), pp. 1147–1160, 1995. @article{Mar95, title = {Collective modes of spin, density, phase, and amplitude in exotic superconductors}, author = {D. van der Marel}, year = {1995}, date = {1995-01-01}, journal = {Physical Review B}, volume = {51}, number = {2}, pages = {1147--1160}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; D. Khomskii Koperoxide hoge Tc-supergeleiders. Journal Article Nederlands Tijdschrift voor Natuurkunde, 61 , pp. 223–226, 1995. @article{MK95, title = {Koperoxide hoge Tc-supergeleiders.}, author = {D. van der Marel and D. Khomskii}, year = {1995}, date = {1995-01-01}, journal = {Nederlands Tijdschrift voor Natuurkunde}, volume = {61}, pages = {223--226}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; Jae H. Kim In-plane and out-of-plane charge dynamics of high-tc cuprates Journal Article Journal of Physics and Chemistry of Solids, 56 (12), pp. 1825–1828, 1995. @article{MK95a, title = {In-plane and out-of-plane charge dynamics of high-tc cuprates}, author = {D. van der Marel and Jae H. Kim}, year = {1995}, date = {1995-01-01}, journal = {Journal of Physics and Chemistry of Solids}, volume = {56}, number = {12}, pages = {1825--1828}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Jae H. Kim; B. J. Feenstra; H. S. Somal; D. van der Marel; A. Wittlin; V. H. M. Duijn; A. A. Menovsky; Wen Lee Infrared anisotropy and plasmons in high-temperature superconductors Journal Article Synthetic Metals, 71 (1-3), pp. 1577–1578, 1995. @article{KFSMWDML95, title = {Infrared anisotropy and plasmons in high-temperature superconductors}, author = {Jae H. Kim and B. J. Feenstra and H. S. Somal and D. van der Marel and A. Wittlin and V. H. M. Duijn and A. A. Menovsky and Wen Lee}, year = {1995}, date = {1995-01-01}, journal = {Synthetic Metals}, volume = {71}, number = {1-3}, pages = {1577--1578}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Jae H. Kim; H. S. Somal; M. T. Czyzyk; D. van der Marel; A. Wittlin; A. M. Gerrits; V. H. M. Duijn; N. T. Hien; A. A. Menovsky Strong damping of the c-axis plasmon in high-Tc cuprate superconductors Journal Article Physica C: Superconductivity, 247 (3-4), pp. 297–308, 1995. @article{KSCMWGDHM95, title = {Strong damping of the c-axis plasmon in high-Tc cuprate superconductors}, author = {Jae H. Kim and H. S. Somal and M. T. Czyzyk and D. van der Marel and A. Wittlin and A. M. Gerrits and V. H. M. Duijn and N. T. Hien and A. A. Menovsky}, year = {1995}, date = {1995-01-01}, journal = {Physica C: Superconductivity}, volume = {247}, number = {3-4}, pages = {297--308}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Jae H. Kim; B. J. Feenstra; H. S. Somal; D. van der Marel; Wen Lee; A. M. Gerrits; A. Wittlin c-axis infrared response of Tl2Ba2Ca2Cu3O10 studied by oblique-incidence polarized-reflectivity measurements Journal Article Physical Review B, 49 (18), pp. 13065–13069, 1994. @article{KFSMLGW94, title = {c-axis infrared response of Tl2Ba2Ca2Cu3O10 studied by oblique-incidence polarized-reflectivity measurements}, author = {Jae H. Kim and B. J. Feenstra and H. S. Somal and D. van der Marel and Wen Lee and A. M. Gerrits and A. Wittlin}, year = {1994}, date = {1994-01-01}, journal = {Physical Review B}, volume = {49}, number = {18}, pages = {13065--13069}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; D. Khomskii; G. Eliashberg Long-range Coulomb forces and the behavior of the chemical potential of electrons in metals at a second-order phase transition Journal Article Physical Review B, 50 (22), pp. 16594–16597, 1994. @article{MKE94, title = {Long-range Coulomb forces and the behavior of the chemical potential of electrons in metals at a second-order phase transition}, author = {D. van der Marel and D. Khomskii and G. Eliashberg}, year = {1994}, date = {1994-01-01}, journal = {Physical Review B}, volume = {50}, number = {22}, pages = {16594--16597}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; Jae H. Kim; H. S. Somal; B. J. Feenstra; A. Wittlin; V. H. M. Duijn; A. A. Menovsky; Wen Lee Damping mechanism of the strongly renormalized c-axis plasma frequency in high-Tc cuprates Journal Article Physica C: Superconductivity, 235-240 , pp. 1145–1146, 1994. @article{MKSFWDML94, title = {Damping mechanism of the strongly renormalized c-axis plasma frequency in high-Tc cuprates}, author = {D. van der Marel and Jae H. Kim and H. S. Somal and B. J. Feenstra and A. Wittlin and V. H. M. Duijn and A. A. Menovsky and Wen Lee}, year = {1994}, date = {1994-01-01}, journal = {Physica C: Superconductivity}, volume = {235-240}, pages = {1145--1146}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
N.Y. Chen; V. Matijasevic; J. E. Mooij; D. van der Marel Scaling of the Hall coefficient and resistivity in underdoped and overdoped RBa2Cu3Oy films Journal Article Physical Review B, 50 (21), pp. 16125–16128, 1994. @article{CMMM94, title = {Scaling of the Hall coefficient and resistivity in underdoped and overdoped RBa2Cu3Oy films}, author = {N.Y. Chen and V. Matijasevic and J. E. Mooij and D. van der Marel}, year = {1994}, date = {1994-01-01}, journal = {Physical Review B}, volume = {50}, number = {21}, pages = {16125--16128}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
O. V. Dolgov; A Karakozov; A MIKHAILOVSKY; B. J. Feenstra; D. van der Marel Observation of the Holstein shift in high-Tc superconductors with thermal-modulation reflectometry Journal Article Physica C: Superconductivity, 229 (3-4), pp. 396–402, 1994. @article{DKMFM94, title = {Observation of the Holstein shift in high-Tc superconductors with thermal-modulation reflectometry}, author = {O. V. Dolgov and A Karakozov and A MIKHAILOVSKY and B. J. Feenstra and D. van der Marel}, year = {1994}, date = {1994-01-01}, journal = {Physica C: Superconductivity}, volume = {229}, number = {3-4}, pages = {396--402}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yu. Gartstein; M. Rice; D. van der Marel Interlayer optical conductivity of a superconducting bilayer Journal Article Physical Review B, 49 (9), pp. 6360–6363, 1994. @article{GRM94, title = {Interlayer optical conductivity of a superconducting bilayer}, author = {Yu. Gartstein and M. Rice and D. van der Marel}, year = {1994}, date = {1994-01-01}, journal = {Physical Review B}, volume = {49}, number = {9}, pages = {6360--6363}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
K Kamaras; D. van der Marel; C. C. Homes; T. Timusk The use of far-infrared ellipsometry in the study of high-temperature superconductors: possibilities and limitations Journal Article Physica C: Superconductivity, 235-240 , pp. 1085–1086, 1994. @article{KMHT94, title = {The use of far-infrared ellipsometry in the study of high-temperature superconductors: possibilities and limitations}, author = {K Kamaras and D. van der Marel and C. C. Homes and T. Timusk}, year = {1994}, date = {1994-01-01}, journal = {Physica C: Superconductivity}, volume = {235-240}, pages = {1085--1086}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Gert Rietveld Surface Spectroscopic Studies of High Temperature Superconductors. PhD Thesis 1993. @phdthesis{Rietveld1993, title = {Surface Spectroscopic Studies of High Temperature Superconductors.}, author = {Gert Rietveld}, year = {1993}, date = {1993-09-13}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
J. Moonen; L. Adriaanse; H. Brom; N.Y. Chen; D. van der Marel; M. Horbach; W. van Saarloos Enhanced ac conductivity below Tc in films of YBa2Cu3O7-$delta$ Journal Article Physical Review B, 47 (21), pp. 14525–14531, 1993. @article{MABCMHS93, title = {Enhanced ac conductivity below Tc in films of YBa2Cu3O7-$delta$}, author = {J. Moonen and L. Adriaanse and H. Brom and N.Y. Chen and D. van der Marel and M. Horbach and W. van Saarloos}, year = {1993}, date = {1993-01-01}, journal = {Physical Review B}, volume = {47}, number = {21}, pages = {14525--14531}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
H. Morawitz; I. Bozovic; V. Z. Kresin; G. Rietveld; D. van der Marel The plasmon density of states of a layered electron gas Journal Article Zeitschrift f&amp;quot;ur Physik B Condensed Matter, 90 (3), pp. 277–281, 1993. @article{MBKRM93, title = {The plasmon density of states of a layered electron gas}, author = {H. Morawitz and I. Bozovic and V. Z. Kresin and G. Rietveld and D. van der Marel}, year = {1993}, date = {1993-01-01}, journal = {Zeitschrift f&amp;quot;ur Physik B Condensed Matter}, volume = {90}, number = {3}, pages = {277--281}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
G. Rietveld; D. van der Marel The chemical potential and thermodynamic properties of narrow band superconductors Journal Article &amp;quot;Electronic properties of high T c materials. The normal and superconducting state of High Tc materials.&amp;quot; Springer Series in Solid State Sciences, 1993. @article{RM93, title = {The chemical potential and thermodynamic properties of narrow band superconductors}, author = {G. Rietveld and D. van der Marel}, year = {1993}, date = {1993-01-01}, journal = {&amp;quot;Electronic properties of high T c materials. The normal and superconducting state of High Tc materials.&amp;quot; Springer Series in Solid State Sciences}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel Weak coupling model for s*- and d-wave superconductivity Inproceedings Proceedings of the 8th Amsterdam miniconference &amp;quot;Correlations in hadronic systems&amp;quot;, pp. 20, Internal report, Amsterdam, 1993. @inproceedings{Mar93, title = {Weak coupling model for s*- and d-wave superconductivity}, author = {D. van der Marel}, year = {1993}, date = {1993-01-01}, booktitle = {Proceedings of the 8th Amsterdam miniconference &amp;quot;Correlations in hadronic systems&amp;quot;}, pages = {20}, publisher = {Internal report}, address = {Amsterdam}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
D. van der Marel; Jae H. Kim; B. J. Feenstra; A. Wittlin Comment on ‘‘Evidence for a-b-plane coupling to longitudinal c-axis phonon in high Tc superconductors’’ Journal Article Physical Review Letters, 71 (16), pp. 2676–2676, 1993. @article{MKFW93, title = {Comment on ‘‘Evidence for a-b-plane coupling to longitudinal c-axis phonon in high Tc superconductors’’}, author = {D. van der Marel and Jae H. Kim and B. J. Feenstra and A. Wittlin}, year = {1993}, date = {1993-01-01}, journal = {Physical Review Letters}, volume = {71}, number = {16}, pages = {2676--2676}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. van Hulst; G. Rietveld; D. van der Marel; F. Tuinstra; H. Jaeger Comment on ‘‘Superconducting phases of Bi and Ga induced by deposition on a Ni sublayer’’ Journal Article Physical Review B, 47 (1), pp. 548–549, 1993. @article{HRMTJ93, title = {Comment on ‘‘Superconducting phases of Bi and Ga induced by deposition on a Ni sublayer’’}, author = {J. van Hulst and G. Rietveld and D. van der Marel and F. Tuinstra and H. Jaeger}, year = {1993}, date = {1993-01-01}, journal = {Physical Review B}, volume = {47}, number = {1}, pages = {548--549}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
G. Rietveld; N.Y. Chen; D. van der Marel Anomalous temperature dependence of the work function in YBa_2Cu_3O_7-$delta$ Journal Article Physical Review Letters, 69 (17), pp. 2578–2581, 1992. @article{RCM92, title = {Anomalous temperature dependence of the work function in YBa_2Cu_3O_7-$delta$}, author = {G. Rietveld and N.Y. Chen and D. van der Marel}, year = {1992}, date = {1992-01-01}, journal = {Physical Review Letters}, volume = {69}, number = {17}, pages = {2578--2581}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; J. E. Mooij Localized superconductivity Journal Article Physical Review B, 45 (17), pp. 9940–9950, 1992. @article{MM92, title = {Localized superconductivity}, author = {D. van der Marel and J. E. Mooij}, year = {1992}, date = {1992-01-01}, journal = {Physical Review B}, volume = {45}, number = {17}, pages = {9940--9950}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; G. Rietveld Universal jump in slope of the chemical potential at second-order phase transitions Journal Article Physical Review Letters, 69 (17), pp. 2575–2577, 1992. @article{MR92, title = {Universal jump in slope of the chemical potential at second-order phase transitions}, author = {D. van der Marel and G. Rietveld}, year = {1992}, date = {1992-01-01}, journal = {Physical Review Letters}, volume = {69}, number = {17}, pages = {2575--2577}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
R. Bar-Deroma; J. Felsteiner; R. Brener; J. Ashkenazi; D. van der Marel Auger spectra and band structure of La1.85Sr0.15CuO4 and La1.85Ba0.15CuO4 Journal Article Physical Review B, 45 (5), pp. 2361–2370, 1992. @article{BFBAM92, title = {Auger spectra and band structure of La1.85Sr0.15CuO4 and La1.85Ba0.15CuO4}, author = {R. Bar-Deroma and J. Felsteiner and R. Brener and J. Ashkenazi and D. van der Marel}, year = {1992}, date = {1992-01-01}, journal = {Physical Review B}, volume = {45}, number = {5}, pages = {2361--2370}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
G. Rietveld; M. Glastra; S.M. Verbrugh; O. Jepsen; O. K. Andersen; D. van der Marel X-ray photo-electron and Auger electron spectroscopy of oxygen in La2CuO4 Journal Article Physica C: Superconductivity, 185-189 , pp. 829–830, 1991. @article{RGVJAM91, title = {X-ray photo-electron and Auger electron spectroscopy of oxygen in La2CuO4}, author = {G. Rietveld and M. Glastra and S.M. Verbrugh and O. Jepsen and O. K. Andersen and D. van der Marel}, year = {1991}, date = {1991-01-01}, journal = {Physica C: Superconductivity}, volume = {185-189}, pages = {829--830}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel Infrared Study of the Order parameter in YBa2Cu3O7 : Analogy to short range order in itinerant Ferromagnets Inproceedings Ashkenazi, J; Vezzoli, G (Ed.): Proceedings of Miami Workshop &amp;quot;Electronic structure and mechanisms for high temperature superconductivity&amp;quot;, pp. 197, Plenum Publishing company, Miami, 1991. @inproceedings{Mar91b, title = {Infrared Study of the Order parameter in YBa2Cu3O7 : Analogy to short range order in itinerant Ferromagnets}, author = {D. van der Marel}, editor = {Ashkenazi, J. and Vezzoli, G.}, year = {1991}, date = {1991-01-01}, booktitle = {Proceedings of Miami Workshop &amp;quot;Electronic structure and mechanisms for high temperature superconductivity&amp;quot;}, pages = {197}, publisher = {Plenum Publishing company}, address = {Miami}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
D. van der Marel Gauge invariance and absence of exact conductance quantization in quantum ballistic transport Journal Article Physical Review B, 43 (4), pp. 3469–3474, 1991. @article{Mar91, title = {Gauge invariance and absence of exact conductance quantization in quantum ballistic transport}, author = {D. van der Marel}, year = {1991}, date = {1991-01-01}, journal = {Physical Review B}, volume = {43}, number = {4}, pages = {3469--3474}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel Two-fluid interpretation of the infrared reflectivity of superconducting Y1Ba2Cu3O7-x . Inproceedings Proceedings of the XIV International School of Theoretical Physics &amp;quot;Strongly correlated electron systems and High Tc superconductivity&amp;quot;, pp. 106–119, Szczyrk-Bita, Polen, 1991. @inproceedings{Mar91a, title = {Two-fluid interpretation of the infrared reflectivity of superconducting Y1Ba2Cu3O7-x .}, author = {D. van der Marel}, year = {1991}, date = {1991-01-01}, booktitle = {Proceedings of the XIV International School of Theoretical Physics &amp;quot;Strongly correlated electron systems and High Tc superconductivity&amp;quot;}, pages = {106--119}, address = {Szczyrk-Bita, Polen}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
D. van der Marel; H. U. Habermeier; D. Heitmann; W. Konig; A. Wittlin Infrared study of the superconducting phase transition in YBa2Cu3O7?x Journal Article Physica C: Superconductivity, 176 (1-3), pp. 1–18, 1991. @article{MHHKW91, title = {Infrared study of the superconducting phase transition in YBa2Cu3O7?x}, author = {D. van der Marel and H. U. Habermeier and D. Heitmann and W. Konig and A. Wittlin}, year = {1991}, date = {1991-01-01}, journal = {Physica C: Superconductivity}, volume = {176}, number = {1-3}, pages = {1--18}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; A. Wittlin; H. U. Habermeier; D. Heitmann Non-BCS behaviour of the superconducting order parameter in YBa2Cu3O7 studied with infrared spectroscopy Journal Article Physica C: Superconductivity, 180 (1-4), pp. 112–115, 1991. @article{MWHH91, title = {Non-BCS behaviour of the superconducting order parameter in YBa2Cu3O7 studied with infrared spectroscopy}, author = {D. van der Marel and A. Wittlin and H. U. Habermeier and D. Heitmann}, year = {1991}, date = {1991-01-01}, journal = {Physica C: Superconductivity}, volume = {180}, number = {1-4}, pages = {112--115}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
H.M. Appelboom; P. Hadley; D. van der Marel; J. E. Mooij High quality flux control system for electron gun evaporation Journal Article IEEE Transactions on Magnetics, 27 (2), pp. 1467–1470, 1991. @article{AHMM91, title = {High quality flux control system for electron gun evaporation}, author = {H.M. Appelboom and P. Hadley and D. van der Marel and J. E. Mooij}, year = {1991}, date = {1991-01-01}, journal = {IEEE Transactions on Magnetics}, volume = {27}, number = {2}, pages = {1467--1470}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
R. Bar-Deroma; J. Felsteiner; R. Brener; J. Ashkenazi; D. van der Marel Determination of the Coulomb parameters of La1.85(Sr,Ba)0.15CuO4 from Auger spectroscopy and electronic band structure Inproceedings Ashkenazi, J; Vezzoli, G (Ed.): Proceedings of Miami Workshop &amp;quot;Electronic structure and mechanisms for high temperature superconductivity&amp;quot;., pp. 215–224, Plenum Publishing company, Miami, 1991. @inproceedings{BFBAM91, title = {Determination of the Coulomb parameters of La1.85(Sr,Ba)0.15CuO4 from Auger spectroscopy and electronic band structure}, author = {R. Bar-Deroma and J. Felsteiner and R. Brener and J. Ashkenazi and D. van der Marel}, editor = {Ashkenazi, J. and Vezzoli, G.}, year = {1991}, date = {1991-01-01}, booktitle = {Proceedings of Miami Workshop &amp;quot;Electronic structure and mechanisms for high temperature superconductivity&amp;quot;.}, pages = {215--224}, publisher = {Plenum Publishing company}, address = {Miami}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
H. Brom; D. van der Marel The Hebel-Slichter enhancement in narrow band systems Journal Article Physica C: Superconductivity, 185-189 , pp. 1457–1458, 1991. @article{BM91, title = {The Hebel-Slichter enhancement in narrow band systems}, author = {H. Brom and D. van der Marel}, year = {1991}, date = {1991-01-01}, journal = {Physica C: Superconductivity}, volume = {185-189}, pages = {1457--1458}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
G. Rietveld; M.A. van Veenendaal; D. van der Marel; J. E. Mooij Temperature dependence of the chemical potential of high-Tc superconductors Journal Article Physica B: Condensed Matter, 165-166 , pp. 1605–1606, 1990. @article{RVMM90, title = {Temperature dependence of the chemical potential of high-Tc superconductors}, author = {G. Rietveld and M.A. van Veenendaal and D. van der Marel and J. E. Mooij}, year = {1990}, date = {1990-01-01}, journal = {Physica B: Condensed Matter}, volume = {165-166}, pages = {1605--1606}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel Anomalous behaviour of the chemical potential in superconductors with a low density of charge carriers Journal Article Physica C: Superconductivity, 165 (1), pp. 35–43, 1990. @article{Mar90, title = {Anomalous behaviour of the chemical potential in superconductors with a low density of charge carriers}, author = {D. van der Marel}, year = {1990}, date = {1990-01-01}, journal = {Physica C: Superconductivity}, volume = {165}, number = {1}, pages = {35--43}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel Observable anomalies in cuprate superconductors related to a cross-over from BCS pairing to Bose-Einstein condensation. Journal Article Springer Series in Solid State Sciences, 99 , pp. 401, 1990. @article{Mar90a, title = {Observable anomalies in cuprate superconductors related to a cross-over from BCS pairing to Bose-Einstein condensation.}, author = {D. van der Marel}, year = {1990}, date = {1990-01-01}, journal = {Springer Series in Solid State Sciences}, volume = {99}, pages = {401}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
H.M. Appelboom; J. Adriaanse; H. Degroot; G. Rietveld; D. van der Marel; J. E. Mooij In situ growth of high temperature superconductor thin films with evaporation techniques using an ozone jet Journal Article Journal of the Less Common Metals, 164-165 , pp. 407–413, 1990. @article{AADRMM90, title = {In situ growth of high temperature superconductor thin films with evaporation techniques using an ozone jet}, author = {H.M. Appelboom and J. Adriaanse and H. Degroot and G. Rietveld and D. van der Marel and J. E. Mooij}, year = {1990}, date = {1990-01-01}, journal = {Journal of the Less Common Metals}, volume = {164-165}, pages = {407--413}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
H.P. Assink; N.Y. Chen; H. U. Habermeier; D. van der Marel Search for deviations of time-reversal symmetry in YBa2Cu3O7 using transport measurements. Journal Article Journal of Less-Common Metals, 1990. @article{ACHM90, title = {Search for deviations of time-reversal symmetry in YBa2Cu3O7 using transport measurements.}, author = {H.P. Assink and N.Y. Chen and H. U. Habermeier and D. van der Marel}, year = {1990}, date = {1990-01-01}, journal = {Journal of Less-Common Metals}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
N.Y. Chen; K. vanDijk; L.W. Lander; H.M. Appelboom; D. van der Marel; P. Hadley; J. E. Mooij YBa2Cu3O7 thin films grown in-situ by laser ablation. Journal Article Journal of Less-Common Metals, 1990. @article{CDLAMHM90, title = {YBa2Cu3O7 thin films grown in-situ by laser ablation.}, author = {N.Y. Chen and K. vanDijk and L.W. Lander and H.M. Appelboom and D. van der Marel and P. Hadley and J. E. Mooij}, year = {1990}, date = {1990-01-01}, journal = {Journal of Less-Common Metals}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
H. Van Kempen; H. F. C. Hoevers; P. J. M. van Bentum; A. J. G. Schellingerhout; D. van der Marel Energy dependence of the Andreev reflection of YBa2Cu3O7?$delta$ Journal Article IBM Journal of Research and Development, 33 (3), pp. 389–393, 1989. @article{VHBSM89, title = {Energy dependence of the Andreev reflection of YBa2Cu3O7?$delta$}, author = {H. Van Kempen and H. F. C. Hoevers and P. J. M. van Bentum and A. J. G. Schellingerhout and D. van der Marel}, year = {1989}, date = {1989-01-01}, journal = {IBM Journal of Research and Development}, volume = {33}, number = {3}, pages = {389--393}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel Theory of the quantum ballistic transport in constrictions and quantum resonance devices. Journal Article Nanostructures Physics and Fabrication, pp. 149–156, 1989. @article{Mar89, title = {Theory of the quantum ballistic transport in constrictions and quantum resonance devices.}, author = {D. van der Marel}, year = {1989}, date = {1989-01-01}, journal = {Nanostructures Physics and Fabrication}, pages = {149--156}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; E. Haanappel Model calculations of the quantum ballistic transport in two-dimensional constriction-type microstructures Journal Article Physical Review B, 39 (11), pp. 7811–7820, 1989. @article{MH89, title = {Model calculations of the quantum ballistic transport in two-dimensional constriction-type microstructures}, author = {D. van der Marel and E. Haanappel}, year = {1989}, date = {1989-01-01}, journal = {Physical Review B}, volume = {39}, number = {11}, pages = {7811--7820}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
E. Haanappel; D. van der Marel Conductance oscillations in two-dimensional Sharvin point contacts Journal Article Physical Review B, 39 (8), pp. 5484–5487, 1989. @article{HM89, title = {Conductance oscillations in two-dimensional Sharvin point contacts}, author = {E. Haanappel and D. van der Marel}, year = {1989}, date = {1989-01-01}, journal = {Physical Review B}, volume = {39}, number = {8}, pages = {5484--5487}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. E. Mooij; D. van der Marel; H.M. Appelboom; A. J. G. Schellingerhout; R. van Deleur; D. Schalkoord Thin films of ybacuo by e-beam evaporation Journal Article Physica C: Superconductivity, 153-155 , pp. 771–771, 1988. @article{MMASVS88, title = {Thin films of ybacuo by e-beam evaporation}, author = {J. E. Mooij and D. van der Marel and H.M. Appelboom and A. J. G. Schellingerhout and R. van Deleur and D. Schalkoord}, year = {1988}, date = {1988-01-01}, journal = {Physica C: Superconductivity}, volume = {153-155}, pages = {771--771}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. J. G. Schellingerhout; R. H. M. Leur; D. Schalkoord; D. van der Marel; J. E. Mooij Analysis of Y1Ba2Cu3O7?y thin films on sapphire substrates made by electron beam evaporation Journal Article Zeitschrift f&amp;quot;ur Physik B Condensed Matter, 71 (1), pp. 1–5, 1988. @article{SLSMM88, title = {Analysis of Y1Ba2Cu3O7?y thin films on sapphire substrates made by electron beam evaporation}, author = {A. J. G. Schellingerhout and R. H. M. Leur and D. Schalkoord and D. van der Marel and J. E. Mooij}, year = {1988}, date = {1988-01-01}, journal = {Zeitschrift f&amp;quot;ur Physik B Condensed Matter}, volume = {71}, number = {1}, pages = {1--5}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
B. van Wees; H. van Houten; C. Beenakker; J. Williamson; L. Kouwenhoven; D. van der Marel; C. Foxon Quantized conductance of point contacts in a two-dimensional electron gas Journal Article Physical Review Letters, 60 (9), pp. 848–850, 1988. @article{WHBWKMF88, title = {Quantized conductance of point contacts in a two-dimensional electron gas}, author = {B. van Wees and H. van Houten and C. Beenakker and J. Williamson and L. Kouwenhoven and D. van der Marel and C. Foxon}, year = {1988}, date = {1988-01-01}, journal = {Physical Review Letters}, volume = {60}, number = {9}, pages = {848--850}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
C. van der Marel; W. Geertsma; E. Drent; P. Kuiper; D. van der Marel; W. van derLugt The 7 Li Knight Shift of Liquid Li-Au Alloys; Properties of the Solid Compound LiAu* Journal Article Zeitschrift f&amp;quot;ur Physikalische Chemie, 156 (Part_2), pp. 569–573, 1988. @article{MGDKML88, title = {The 7 Li Knight Shift of Liquid Li-Au Alloys; Properties of the Solid Compound LiAu*}, author = {C. van der Marel and W. Geertsma and E. Drent and P. Kuiper and D. van der Marel and W. van derLugt}, year = {1988}, date = {1988-01-01}, journal = {Zeitschrift f&amp;quot;ur Physikalische Chemie}, volume = {156}, number = {Part_2}, pages = {569--573}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; J. van Elp; G. A. Sawatzky; D. Heitmann X-ray photoemission, bremsstrahlung isochromat, Auger-electron, and optical spectroscopy studies of Y-Ba-Cu-O thin films Journal Article Physical Review B, 37 (10), pp. 5136–5141, 1988. @article{MESH88, title = {X-ray photoemission, bremsstrahlung isochromat, Auger-electron, and optical spectroscopy studies of Y-Ba-Cu-O thin films}, author = {D. van der Marel and J. van Elp and G. A. Sawatzky and D. Heitmann}, year = {1988}, date = {1988-01-01}, journal = {Physical Review B}, volume = {37}, number = {10}, pages = {5136--5141}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; D. Heitmann; J. Vanlep; G. A. Sawatzky Valence band studies of YBaCuO thin films Journal Article Physica C: Superconductivity, 153-155 , pp. 1445–1446, 1988. @article{MHVS88, title = {Valence band studies of YBaCuO thin films}, author = {D. van der Marel and D. Heitmann and J. Vanlep and G. A. Sawatzky}, year = {1988}, date = {1988-01-01}, journal = {Physica C: Superconductivity}, volume = {153-155}, pages = {1445--1446}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; G. A. Sawatzky Electron-electron interaction and localization in d and f transition metals Journal Article Physical Review B, 37 (18), pp. 10674–10684, 1988. @article{MS88, title = {Electron-electron interaction and localization in d and f transition metals}, author = {D. van der Marel and G. A. Sawatzky}, year = {1988}, date = {1988-01-01}, journal = {Physical Review B}, volume = {37}, number = {18}, pages = {10674--10684}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
H. F. C. Hoevers; P. J. M. van Bentum; L. van De Leemput; H. Van Kempen; A. J. G. Schellingerhout; D. van der Marel Determination of the energy gap in a thin YBa2Cu3O7?x film by Andreev reflection and by tunneling Journal Article Physica C: Superconductivity, 152 (1), pp. 105–110, 1988. @article{HBVVSM88, title = {Determination of the energy gap in a thin YBa2Cu3O7?x film by Andreev reflection and by tunneling}, author = {H. F. C. Hoevers and P. J. M. van Bentum and L. van De Leemput and H. Van Kempen and A. J. G. Schellingerhout and D. van der Marel}, year = {1988}, date = {1988-01-01}, journal = {Physica C: Superconductivity}, volume = {152}, number = {1}, pages = {105--110}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
W. Folkerts; D. van der Marel; C. Haas; G. A. Sawatzky; D. Norman; H. Padmore; H. Wright; P. Weightman The use of Cooper minima effects and resonant photoemission in the study of the electronic structure of dilute alloys Journal Article Journal of Physics F: Metal Physics, 17 (3), pp. 657–665, 1987. @article{FMHSNPWW87, title = {The use of Cooper minima effects and resonant photoemission in the study of the electronic structure of dilute alloys}, author = {W. Folkerts and D. van der Marel and C. Haas and G. A. Sawatzky and D. Norman and H. Padmore and H. Wright and P. Weightman}, year = {1987}, date = {1987-01-01}, journal = {Journal of Physics F: Metal Physics}, volume = {17}, number = {3}, pages = {657--665}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
P. Weightman; H. Wright; S. Waddington; D. van der Marel; G. A. Sawatzky; G. Diakun; D. Norman Local lattice expansion around Pd impurities in Cu and its influence on the Pd density of states: An extended x-ray-absorption fine-structure and Auger study Journal Article Physical Review B, 36 (17), pp. 9098–9106, 1987. @article{WWWMSDN87, title = {Local lattice expansion around Pd impurities in Cu and its influence on the Pd density of states: An extended x-ray-absorption fine-structure and Auger study}, author = {P. Weightman and H. Wright and S. Waddington and D. van der Marel and G. A. Sawatzky and G. Diakun and D. Norman}, year = {1987}, date = {1987-01-01}, journal = {Physical Review B}, volume = {36}, number = {17}, pages = {9098--9106}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; J. Jullianus; G. A. Sawatzky Pd and Pt impurity-induced changes in noble-metal density of states: Photoelectron spectroscopy and theory Journal Article Physical Review B, 32 (10), pp. 6331–6346, 1985. @article{MJS85, title = {Pd and Pt impurity-induced changes in noble-metal density of states: Photoelectron spectroscopy and theory}, author = {D. van der Marel and J. Jullianus and G. A. Sawatzky}, year = {1985}, date = {1985-01-01}, journal = {Physical Review B}, volume = {32}, number = {10}, pages = {6331--6346}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; C. Westra; G. A. Sawatzky; F. U. Hillebrecht Electronic structure of Mn impurities in noble metals Journal Article Physical Review B, 31 (4), pp. 1936–1949, 1985. @article{MWSH85, title = {Electronic structure of Mn impurities in noble metals}, author = {D. van der Marel and C. Westra and G. A. Sawatzky and F. U. Hillebrecht}, year = {1985}, date = {1985-01-01}, journal = {Physical Review B}, volume = {31}, number = {4}, pages = {1936--1949}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
A. Amato; D. van der Marel; G. A. Sawatzky Microscopic theory for triplet pairing in an anderson lattice Journal Article Solid State Communications, 55 (11), pp. 937–940, 1985. @article{MS85, title = {Microscopic theory for triplet pairing in an anderson lattice}, author = {A. Amato and D. van der Marel and G. A. Sawatzky}, year = {1985}, date = {1985-01-01}, journal = {Solid State Communications}, volume = {55}, number = {11}, pages = {937--940}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
J. Jullianus; A Myers; F F Bekker; D. van der Marel; E F Allen A unified approach to residual resistivity, thermoelectric power, ultraviolet photoelectron spectroscopy and de Haas-van Alphen measurements on dilute CuNi, CuPd, CuRh and CuPt alloys Journal Article Journal of Physics F: Metal Physics, 15 (1), pp. 111–139, 1985. @article{JMBMA85, title = {A unified approach to residual resistivity, thermoelectric power, ultraviolet photoelectron spectroscopy and de Haas-van Alphen measurements on dilute CuNi, CuPd, CuRh and CuPt alloys}, author = {J. Jullianus and A Myers and F F Bekker and D. van der Marel and E F Allen}, year = {1985}, date = {1985-01-01}, journal = {Journal of Physics F: Metal Physics}, volume = {15}, number = {1}, pages = {111--139}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Dirk van der Marel The electronic structure of embedded transition metal atoms. PhD Thesis 1985. @phdthesis{vanderMarel1985, title = {The electronic structure of embedded transition metal atoms.}, author = {Dirk van der Marel}, year = {1985}, date = {1985-01-01}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
M. Vos; D. van der Marel; G. A. Sawatzky Auger line shape in alloys Journal Article Physical Review B, 29 (6), pp. 3073–3084, 1984. @article{VMS84, title = {Auger line shape in alloys}, author = {M. Vos and D. van der Marel and G. A. Sawatzky}, year = {1984}, date = {1984-01-01}, journal = {Physical Review B}, volume = {29}, number = {6}, pages = {3073--3084}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; G. A. Sawatzky; F. U. Hillebrecht Direct Observation of the Exchange-Split Virtual Bound State in Dilute Mn Alloys Journal Article Physical Review Letters, 53 (2), pp. 206–209, 1984. @article{MSH84, title = {Direct Observation of the Exchange-Split Virtual Bound State in Dilute Mn Alloys}, author = {D. van der Marel and G. A. Sawatzky and F. U. Hillebrecht}, year = {1984}, date = {1984-01-01}, journal = {Physical Review Letters}, volume = {53}, number = {2}, pages = {206--209}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; G. A. Sawatzky; J. Jullianus Spin-orbit and crystal-field effects in AgPt dilute alloys Journal Article Journal of Physics F: Metal Physics, 14 (1), pp. 281–290, 1984. @article{MSJ84, title = {Spin-orbit and crystal-field effects in AgPt dilute alloys}, author = {D. van der Marel and G. A. Sawatzky and J. Jullianus}, year = {1984}, date = {1984-01-01}, journal = {Journal of Physics F: Metal Physics}, volume = {14}, number = {1}, pages = {281--290}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; G. A. Sawatzky; R. Zeller; F. U. Hillebrecht; J. C. Fuggle Unoccupied band critical point energies of noble metals determined with Bremsstrahlung isochromat spectroscopy Journal Article Solid State Communications, 50 (1), pp. 47–50, 1984. @article{MSZHF84, title = {Unoccupied band critical point energies of noble metals determined with Bremsstrahlung isochromat spectroscopy}, author = {D. van der Marel and G. A. Sawatzky and R. Zeller and F. U. Hillebrecht and J. C. Fuggle}, year = {1984}, date = {1984-01-01}, journal = {Solid State Communications}, volume = {50}, number = {1}, pages = {47--50}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
D. van der Marel; H. denHartog Raman spectroscopy of BaF_2:R^3+ and SrF_2:R^3+ solid solutions between 300 and 1400 K Journal Article Physical Review B, 25 (11), pp. 6602–6608, 1982. @article{MH82, title = {Raman spectroscopy of BaF_2:R^3+ and SrF_2:R^3+ solid solutions between 300 and 1400 K}, author = {D. van der Marel and H. denHartog}, year = {1982}, date = {1982-01-01}, journal = {Physical Review B}, volume = {25}, number = {11}, pages = {6602--6608}, keywords = {}, pubstate = {published}, tppubtype = {article} } |