Electron-Electron Interactions in Graphene
classification
❄️ cond-mat.mtrl-sci
cond-mat.mes-hall
keywords
grapheneapproximationawaycalculationcontrolleddiracdiscusselectron-electron
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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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