Electron scattering on microscopic corrugations in graphene

Details Electron scattering on microscopic corrugations in graphene Electron scattering on microscopic corrugations in graphene

2007-06-17

arxiv.org/abs/0706.2490v2

Phil. Trans. R. Soc. A 366, 195-204 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Final version, to be published in Philos. Trans. Royal Soc. A

Scientific paper

10.1098/rsta.2007.2157

We discuss various scattering mechanisms for Dirac fermions in single-layer graphene. It is shown that scattering on a short-range potential (due to, for example, neutral impurities) is mostly irrelevant for electronic quality of graphene, which is likely to be controlled by charged impurities and ripples (microscopic corrugations of a graphene sheet). The latter are an inherent feature of graphene due to its two-dimensional nature and can also be an important factor in defining the electron mean free path. We show that certain types of ripples create a long-range scattering potential, similar to Coulomb scatterers, and result in charge-carrier mobility practically independent on carrier concentration, in agreement with experimental observations.

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