Many-body exchange-correlation effects in graphene

TL;DR

This paper investigates many-body exchange-correlation effects in doped graphene by calculating electron self-energy, spectral functions, and hot carrier scattering, revealing unique energy-dependent quasiparticle lifetimes due to graphene's linear dispersion.

Contribution

It provides the first detailed calculation of electron self-energy and inelastic scattering in doped graphene using dynamical-screening approximation, highlighting unique many-body effects.

Findings

Energy-dependent quasiparticle lifetimes differ from semiconductors

Calculated inelastic scattering rates and mean free paths

Identified the impact of linear dispersion on many-body effects

Abstract

We calculate, within the leading-order dynamical-screening approximation, the electron self-energy and spectral function at zero temperature for extrinsic (or gated/doped) graphene. We also calculate hot carrier inelastic scattering due to electron-electron interactions in graphene. We obtain the inelastic quasiparticle lifetimes and associated mean free paths from the calculated self-energy. The linear dispersion and chiral property of graphene gives energy dependent lifetimes that are qualitatively different from those of parabolic-band semiconductors.