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Paper   IPM / Physic / 11823
School of Physics
  Title:   Acoustic Plasmons and Composite Hole-Acoustic Plasmon Satellite Bands in Graphene on A Metal Gate
1.  A. Principi
2.  R. Asgari
3.  M. Polin
  Status:   Published
  Journal: Solid State Commun.(Fast Track)
  Vol.:  151
  Year:  2011
  Pages:   1627
  Supported by:  IPM
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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