Electron-Electron Interactions in Graphene

Details Electron-Electron Interactions in Graphene Electron-Electron Interactions in Graphene

2007-08-23

arxiv.org/abs/0708.3239v3

Physics

Condensed Matter

Materials Science

updated with additional paragraph and reference

Scientific paper

We discuss the validity (or not) of the ring-diagram approximation (i.e. RPA)
in the calculation of graphene self-energy in the weak-coupling ($r_s \ll 1$)
limit, showing that RPA is a controlled and valid approximation for
\textit{extrinsic} graphene where the Fermi level is away from the Dirac point.

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