Journal
SOLID STATE COMMUNICATIONS
Volume 175, Issue -, Pages 114-118Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2013.04.011
Keywords
Graphene; Plasmons
Categories
Funding
- Juan de la Cierva Program (MINECO, Spain)
- Triangle de la Physique
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The electrodynamics of a two-dimensional gas of massless fermions in graphene is studied by a collisionless hydrodynamic approach. A low-energy dispersion relation for the collective modes (plasmons) is derived both in the absence and in the presence of a perpendicular magnetic field. The results for graphene are compared to those for a standard two-dimensional gas of massive electrons. We further compare the results within the classical hydrodynamic approach to the full quantum mechanical calculation in the random phase approximation. The low-energy dispersion relation is shown to be a good approximation at small wave vectors. The limitations of this approach at higher order are also discussed. (C) 2013 Elsevier Ltd. All rights reserved.
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