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Tight-binding electron–phonon coupling and band renormalization in graphene

The kink structure in the quasiparticle spectrum of electrons in graphene observed at 200 meV below the Fermi level by angle-resolved photoemission spectroscopy (ARPES) was claimed to be caused by a tight-binding electron–phonon (e–ph) coupling inthe previous theoretical studies. However, we numerically find that the e–ph coupling effect in this approach is too weak to account for the ARPES data. The former agreement between this approach and the ARPES data is due to an enlargement of the coupling constant by almost four times.