Kinks in the σ Band of Graphene Induced by Electron-Phonon Coupling

Mazzola, Federico (författare)

Wells, Justin W. (författare)

Yakimova, Rositsa (författare)

(utgivare)

Abstract Ämnesord

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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.

Av författaren/redakt...: Mazzola, Federic ...; Wells, Justin W.; Yakimova, Rosits ...; Ulstrup, Soren; Miwa, Jill A.; Balog, Richard; visa fler...; Bianchi, Marco; Leandersson, Mat ...; Adell, Johan; Hofmann, Philip; Balasubramanian, ...; visa färre...

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