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

Mazzola, FedericoNorwegian University of Science and Technology NTNU, Norway (författare)

Funding Agencies|Lundbeck Foundation||VILLUM Foundation||Danish Council for Independent Research/Technology and Production Sciences||Swedish Research Council||Knut and Alice Wallenberg Foundations||
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.

Wells, Justin W.Norwegian University of Science and Technology NTNU, Norway (författare)
Yakimova, RositsaLinköpings universitet,Halvledarmaterial,Tekniska högskolan(Swepub:liu)rosia15 (författare)
Ulstrup, SorenAarhus University, Denmark (författare)
Miwa, Jill A.Aarhus University, Denmark (författare)
Balog, RichardAarhus University, Denmark (författare)
Bianchi, MarcoAarhus University, Denmark (författare)
Leandersson, MatsLund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,Lund University, Sweden(Swepub:lu)maxl-mle (författare)
Adell, JohanLund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,Lund University, Sweden(Swepub:lu)maxl-jae (författare)
Hofmann, PhilipAarhus University, Denmark (författare)
Thiagarajan, BalasubramanianLund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,Lund University, Sweden(Swepub:lu)maxl-bth (författare)
Norwegian University of Science and Technology NTNU, NorwayHalvledarmaterial (creator_code:org_t)

Ingår i:Physical Review Letters: American Physical Society111:21, s. 216806-0031-90071079-7114

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; Thiagarajan, Bal ...; visa färre...

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