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

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arxiv 0707.1666 v2 pith:OHAVSK3W submitted 2007-07-11 cond-mat.mtrl-sci

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

classification cond-mat.mtrl-sci
keywords graphenedependenceenergyinteractionlinearself-energyvelocityband
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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