Acoustic plasmons and composite hole-acoustic plasmon satellite bands in graphene on a metal gate

作者：Principi A^*; Asgari Reza; Polini Marco

来源：Solid State Communications, 2011, 151(21): 1627-1630.

DOI：10.1016/j.ssc.2011.07.015

• Graphene
• Crystal growth on metal gate
• Electron-electron interactions
• Photoelectron spectroscopy

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.

• 出版日期2011-11