Drude weight, plasmon dispersion, and a.c. conductivity in doped graphene sheets (Articolo in rivista)

Type
Label
  • Drude weight, plasmon dispersion, and a.c. conductivity in doped graphene sheets (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.84.045429 (literal)
Alternative label
  • S.H. Abedinpour, G. Vignale, A. Principi, M. Polini, W.-K. Tse, A.H. MacDonald (2011)
    Drude weight, plasmon dispersion, and a.c. conductivity in doped graphene sheets
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • S.H. Abedinpour, G. Vignale, A. Principi, M. Polini, W.-K. Tse, A.H. MacDonald (literal)
Pagina inizio
  • 045429 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://link.aps.org/doi/10.1103/PhysRevB.84.045429 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 84 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, I-56126 Pisa, Italy Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA (literal)
Titolo
  • Drude weight, plasmon dispersion, and a.c. conductivity in doped graphene sheets (literal)
Abstract
  • We demonstrate that the plasmon frequency and Drude weight of the electron liquid in a doped graphene sheet are strongly renormalized by electron-electron interactions even in the long-wavelength limit. This effect is not captured by the random-phase approximation (RPA), commonly used to describe electron fluids, and is due to coupling between the center-of-mass motion and the pseudospin degree of freedom of the graphene's massless Dirac fermions. By making use of diagrammatic perturbation theory to first order in the electron-electron interaction, we show that this coupling enhances both the plasmon frequency and the Drude weight relative to the RPA value. We also show that interactions are responsible for a significant enhancement of the optical conductivity at frequencies just above the absorption threshold. Our predictions can be checked by far-infrared spectroscopy or inelastic light scattering. (literal)
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