Electron spectrum of epitaxial graphene monolayers

Details Electron spectrum of epitaxial graphene monolayers Electron spectrum of epitaxial graphene monolayers

2010-09-11

arxiv.org/abs/1009.2185v1

Physics

Condensed Matter

Materials Science

5 pages, 2 figures

Scientific paper

Epitaxial graphene on SiC possesses, quite remarkably, an electron spectrum similar to that of freestanding samples. Yet, the coupling to the substrate, albeit small, affects the quasiparticle properties. Combining \emph{ab initio} calculations with symmetry analysis, we derive a modified Dirac-Weyl Hamiltonian for graphene epilayers. While for the epilayer on the C-face the Dirac cone remains almost intact, for epilayers on the Si-face the band splitting is about 30\,meV. At certain energies, the Dirac bands are significantly distorted by the resonant interaction with interface states, which should lead to mobility suppression, especially on the Si-face.

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