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  • Title: Kinks in the σ band of graphene induced by electron-phonon coupling.
    Author: Mazzola F, Wells JW, Yakimova R, Ulstrup S, Miwa JA, Balog R, Bianchi M, Leandersson M, Adell J, Hofmann P, Balasubramanian T.
    Journal: Phys Rev Lett; 2013 Nov 22; 111(21):216806. PubMed ID: 24313515.
    Abstract:
    Angle-resolved photoemission spectroscopy reveals pronounced kinks in the dispersion of the σ band of graphene. Such kinks are usually caused by the combination of a strong electron-boson interaction and the cutoff in the Fermi-Dirac distribution. They are therefore not expected for the σ band of graphene that has a binding energy of more than ≈3.5 eV. We argue that the observed kinks are indeed caused by the electron-phonon interaction, but the role of the Fermi-Dirac distribution cutoff is assumed by a cutoff in the density of σ states. The existence of the effect suggests a very weak coupling of holes in the σ band not only to the π electrons of graphene but also to the substrate electronic states. This is confirmed by the presence of such kinks for graphene on several different substrates that all show a strong coupling constant of λ≈1.
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