Velocity Renormalization and Carrier Lifetime in Graphene from Electron-Phonon Interaction

Abstract

We present a first-principles investigation of the phonon-induced electron self-energy in graphene. The energy dependence of the self-energy reflects the peculiar linear bandstructure of graphene and deviates substantially from the usual metallic behavior. The effective band velocity of the Dirac fermions is found to be reduced by 4-8%, depending on doping, by the interaction with lattice vibrations. Our results are consistent with the observed linear dependence of the electronic linewidth on the binding energy in photoemission spectra.

4 pages, 4 figures; reference 22 added, numerical error corrected

References in corpus (1)

• Two Dimensional Atomic Crystals

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