“School of Physics”
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| Paper IPM / P / 11823 |
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| Abstract: | |||||||
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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 system. Despite screening exerted
by the metal, we found that graphene's quasiparticle spectrum displays a very rich structure characterized
by composite hole-acoustic plasmon satellite bands (that we term for brevity ßoundarons"),
which can be observed by e.g. angle-resolved photoemission spectroscopy.
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