Thursday, February 21, 2013

1302.5036 (L. S. Levitov et al.)

Electron-Electron Interactions and Plasmon Dispersion in Graphene    [PDF]

L. S. Levitov, A. V. Shtyk, M. V. Feigelman
Plasmons in two-dimensional systems with non-parabolic band, such as graphene, feature strong dependence on electron-electron interactions. We use a many-body approach to relate plasmon dispersion at long wavelengths to the Landau's Fermi-liquid interaction parameters and quasiparticle velocity. This general relation is illustrated using a model with N fermion species, giving a power-law dependence for plasmon frequency vs. carrier density at leading order in large N. An identical renormalization is predicted for magnetoplasmon resonance. We propose that gate-tunability of plasmons in graphene can be used to directly probe the effects of electron-electron interaction.
View original: http://arxiv.org/abs/1302.5036

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