Abstract
In graphene, a kink was observed at energies of 200 meV below the Fermi level ${\ensuremath{\epsilon}}_{F}$ by angle-resolved photoemission spectroscopy (ARPES). It was claimed that the kink structure can be explained by the electron-phonon interaction [Phys. Rev. Lett. 99, 236802 (2007)], but their theoretical results were not consistent with the ARPES data as well as the first-principles results. We revisit this approach and find a different quasiparticle dispersion which agrees with the ARPES data and the first-principle calculations.
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