SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Transport (joint session TT/DY)
TT 28.6: Vortrag
Freitag, 1. Oktober 2021, 14:45–15:00, H6
Viscous, elastic and ballistic shear response of electron fluids probed through optical spectroscopy — •Davide Valentinis1,2, Jan Zaanen3, Dirk van der Marel4, and Joerg Schmalian1,2 — 1Institut für Quantenmaterialien und Technologien, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany — 2Max Planck Institute for Solid State Research, Heisenbergstra{\ss}e 1, D-70569 Stuttgart (DE) — 3Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland — 4Institute-Lorentz for Theoretical Physics, Leiden University, PO Box 9506, NL-2300 RA Leiden, The Netherlands
Can optical spectroscopy provide complementary and unambiguous fingerprints of spatial nonlocality in bulk and layered materials, and under which conditions? To answer these questions, we investigate the nonlocal current response of 3D charged Fermi liquids, and 2D isotropic and anisotropic metals, taking into account momentum-conserving collisions and momentum-relaxing scattering in kinetic-theory approaches. In strongly interacting Fermi liquids, a propagating shear mode of Fermi-surface deformation, analogous to transverse sound in liquid helium, determines characteristic oscillating patterns of the thin-film transmission as a function of radiation frequency. We develop a kinetic theory for the distribution function of 2D Fermi gases with arbitrary electronic dispersion relation, using a collision operator formalism. The skin depth and surface impedance are shown to qualitatively depend on the shape and orientation of the polygonal Fermi surface.