Journal
SOLID STATE COMMUNICATIONS
Volume 151, Issue 21, Pages 1627-1630Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2011.07.015
Keywords
Graphene; Crystal growth on metal gate; Electron-electron interactions; Photoelectron spectroscopy
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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 systems. 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. (C) 2011 Elsevier Ltd. All rights reserved.
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