Plasmon mass and Drude weight in strongly spin-orbit-coupled two-dimensional electron gases (Articolo in rivista)

Type
Label
  • Plasmon mass and Drude weight in strongly spin-orbit-coupled two-dimensional electron gases (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.83.115135 (literal)
Alternative label
  • A. Agarwal, S. Chesi, T. Jungwirth, J. Sinova, G. Vignale, M. Polini (2011)
    Plasmon mass and Drude weight in strongly spin-orbit-coupled two-dimensional electron gases
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • A. Agarwal, S. Chesi, T. Jungwirth, J. Sinova, G. Vignale, M. Polini (literal)
Pagina inizio
  • 115135 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://link.aps.org/doi/10.1103/PhysRevB.83.115135 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 83 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, I-56126 Pisa, Italy Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland Institute of Physics ASCR, v.v.i., Cukrovarnick 10, 162 53 Praha 6, Czech Republic School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA Kavli Institute for Theoretical Physics China, CAS, Beijing 100190, China Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA (literal)
Titolo
  • Plasmon mass and Drude weight in strongly spin-orbit-coupled two-dimensional electron gases (literal)
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. (literal)
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