Electron-Electron Interactions in Graphene
arXiv:0708.3239
Abstract
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 () limit, showing that RPA is a controlled and valid approximation for \textit{extrinsic} graphene where the Fermi level is away from the Dirac point.
updated with additional paragraph and reference