Acoustic plasmons and "soundarons" in graphene on a metal gate

Details Acoustic plasmons and "soundarons" in graphene on a metal gate Acoustic plasmons and "soundarons" in graphene on a metal gate

2011-04-14

arxiv.org/abs/1104.2707v1

Solid State Commun. 151, 1627 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 7 figures

Scientific paper

10.1016/j.ssc.2011.07.015

We demonstrate that single-layer graphene in the presence of a metal gate displays a gapless collective (plasmon) mode that has a linear dispersion at long wavelengths. We calculate exactly the acoustic-plasmon group velocity at the level of the random phase approximation and carry out microscopic calculations of the one-body spectral function of such system. Despite screening exerted by the metal, we find that graphene's quasiparticle spectrum displays a very rich structure characterized by composite hole-acoustic plasmon satellite bands (that we term for brevity "soundarons"), which can be observed by e.g. angle-resolved photoemission spectroscopy.

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