Electron-Electron Interactions in Graphene

2007/08/23 by Sarma, S. Das, Hu, Ben Yu-Kuang, Hwang, E. H. +1
#FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall)

paper · doi:10.48550/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 (r_s ≪ 1) limit, showing that RPA is a controlled and valid approximation for extrinsic graphene where the Fermi level is away from the Dirac point.

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