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Plasmon mass and Drude weight in strongly spin-orbit-coupled two-dimensional electron gases

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Title: Plasmon mass and Drude weight in strongly spin-orbit-coupled two-dimensional electron gases
Author: Agarwal, Amit; Chesi, Stefano; Jungwirth, T.; Sinova, Jairo; Vignale, G.; Polini, Marco.
Abstract: Spin-orbit-coupled two-dimensional electron gases (2DEGs) are a textbook example of helical Fermi liquids, i.e., quantum liquids in which spin (or pseudospin) and momentum degrees of freedom at the Fermi surface have a well-defined correlation. Here we study the long-wavelength plasmon dispersion and the Drude weight of archetypical spin-orbit-coupled 2DEGs. We first show that these measurable quantities are sensitive to electron-electron interactions due to broken Galilean invariance and then discuss in detail why the popular random phase approximation is not capable of describing the collective dynamics of these systems even at very long wavelengths. This work is focused on presenting approximate microscopic calculations of these quantities based on the minimal theoretical scheme that captures the basic physics correctly, i.e., the time-dependent Hartree-Fock approximation. We find that interactions enhance the "plasmon mass" and suppress the Drude weight. Our findings can be tested by inelastic light scattering, electron energy loss, and far-infrared optical-absorption measurements.
Description: Journals published by the American Physical Society can be found at http://journals.aps.org/
Publisher: American Physical Society
Subject: HGTE QUANTUM-WELLS
SINGLE DIRAC CONE
TOPOLOGICAL INSULATORS
SPINTRONICS
EXCITATIONS
SCATTERING
SYSTEMS
SURFACE
Physics
Department: Physics and Astronomy
URI: http://dx.doi.org/10.1103/PhysRevB.83.115135
Date: 2011

Citation

Amit Agarwal, Stefano Chesi, T. Jungwirth, Jairo Sinova, G. Vignale and Marco Polini. Phys.Rev.B 83 115135 2011."Copyright (2011) by the American Physical Society."

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