Plasmon and coupled plasmon-phonon modes in graphene in the presence of inter-band excitation channels

Details Plasmon and coupled plasmon-phonon modes in graphene in the presence of inter-band excitation channels Plasmon and coupled plasmon-phonon modes in graphene in the presence of inter-band excitation channels

2011-08-26

arxiv.org/abs/1108.5265v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 3 figures

Scientific paper

Plasmon and coupled plasmon-phonon modes in graphene are investigated the-oretically within the diagrammatic self-consistent field theory. It shows that two plasmon modes and four coupled plasmon-phonon modes can be excited via intra-and inter-band transition channels. It is found that with increasing q and carrier density, the plasmon modes couple strongly with the optic-phonon modes in graphene. The coupled plasmon-phonon modes exhibit some interesting features which can be utilized to realize the plasmonic devices. Our results suggest that the carrier-phonon interaction should be considered to understand and explain the properties of elementary electronic excitations in graphene.

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