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Dispersion kinks from electronic correlations in an unconventional iron-based superconductor.
Nat Commun
November 2024
Department of Physics, The Pennsylvania State University, University Park, PA, USA.
The attractive interaction in conventional BCS superconductors is provided by a bosonic mode. However, the pairing glue of most unconventional superconductors is unknown. The effect of electron-boson coupling is therefore extensively studied in these materials.
View Article and Find Full Text PDFElectronic interactions in Dirac fluids visualized by nano-terahertz spacetime interference of electron-photon quasiparticles.
Sci Adv
October 2024
Department of Physics, Columbia University, New York, NY 10027, USA.
Ultraclean graphene at charge neutrality hosts a quantum critical Dirac fluid of interacting electrons and holes. Interactions profoundly affect the charge dynamics of graphene, which is encoded in the properties of its electron-photon collective modes: surface plasmon polaritons (SPPs). Here, we show that polaritonic interference patterns are particularly well suited to unveil the interactions in Dirac fluids by tracking polaritonic interference in time at temporal scales commensurate with the electronic scattering.
View Article and Find Full Text PDFProbing the Local Rapidity Distribution of a One-Dimensional Bose Gas.
Phys Rev Lett
September 2024
Laboratoire Charles Fabry, Institut d'Optique Graduate School, CNRS, Université Paris-Saclay, 91127 Palaiseau, France.
One-dimensional Bose gases with contact repulsive interactions are characterized by the presence of infinite-lifetime quasiparticles whose momenta are called the "rapidities." Here, we develop a probe of the local rapidity distribution, based on the fact that rapidities are the asymptotic momenta of the particles after a long one-dimensional expansion. This is done by performing an expansion of a selected slice of the gas.
View Article and Find Full Text PDFInterplay between disorder and electronic correlations in compositionally complex alloys.
Nat Commun
September 2024
New Technologies Research Center, University of West Bohemia, Plzen, Czech Republic.
Owing to their exceptional mechanical, electronic, and phononic transport properties, compositionally complex alloys, including high-entropy alloys, represent an important class of materials. However, the interplay between chemical disorder and electronic correlations, and its influence on electronic structure-derived properties, remains largely unexplored. This is addressed for the archetypal CrMnFeCoNi alloy using resonant and valence band photoemission spectroscopy, electrical resistivity, and optical conductivity measurements, complemented by linear response calculations based on density functional theory.
View Article and Find Full Text PDFInterlayer and Moiré excitons in atomically thin double layers: From individual quantum emitters to degenerate ensembles.
MRS Bull
September 2024
Institute of Physics, University of Münster, Münster, Germany.
Abstract: Interlayer excitons (IXs), composed of electron and hole states localized in different layers, excel in bilayers composed of atomically thin van der Waals materials such as semiconducting transition-metal dichalcogenides (TMDs) due to drastically enlarged exciton binding energies, exciting spin-valley properties, elongated lifetimes, and large permanent dipoles. The latter allows modification by electric fields and the study of thermalized bosonic quasiparticles, from the single particle level to interacting degenerate dense ensembles. Additionally, the freedom to combine bilayers of different van der Waals materials without lattice or relative twist-angle constraints leads to layer-hybridized and Moiré excitons, which can be widely engineered.
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