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

Mazzola, Federico; Wells, Justin W.; Yakimova, Rositza; Ulstrup, Soren; Miwa, Jill A.; Balog, Richard; Bianchi, Marco; Leandersson, Mats LU ; Adell, Johan LU and Hofmann, Philip, et al. (2013) In Physical Review Letters 111(21).
Abstract
Angle-resolved photoemission spectroscopy reveals pronounced kinks in the dispersion of the sigma 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 sigma band of graphene that has a binding energy of more than approximate to 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 sigma states. The existence of the effect suggests a very weak coupling of holes in the sigma band not only to the pi electrons of graphene but also to the substrate electronic states. This is... (More)
Angle-resolved photoemission spectroscopy reveals pronounced kinks in the dispersion of the sigma 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 sigma band of graphene that has a binding energy of more than approximate to 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 sigma states. The existence of the effect suggests a very weak coupling of holes in the sigma band not only to the pi 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 lambda approximate to 1. (Less)
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published
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Physical Review Letters
volume
111
issue
21
publisher
American Physical Society
external identifiers
  • wos:000327246200003
  • scopus:84888330785
ISSN
1079-7114
DOI
10.1103/PhysRevLett.111.216806
language
English
LU publication?
yes
id
c463e574-0689-498b-b44a-458a43f8b457 (old id 4196631)
date added to LUP
2014-01-13 16:52:34
date last changed
2019-05-07 01:09:33
@article{c463e574-0689-498b-b44a-458a43f8b457,
  abstract     = {Angle-resolved photoemission spectroscopy reveals pronounced kinks in the dispersion of the sigma 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 sigma band of graphene that has a binding energy of more than approximate to 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 sigma states. The existence of the effect suggests a very weak coupling of holes in the sigma band not only to the pi 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 lambda approximate to 1.},
  articleno    = {216806},
  author       = {Mazzola, Federico and Wells, Justin W. and Yakimova, Rositza and Ulstrup, Soren and Miwa, Jill A. and Balog, Richard and Bianchi, Marco and Leandersson, Mats and Adell, Johan and Hofmann, Philip and Thiagarajan, Balasubramanian},
  issn         = {1079-7114},
  language     = {eng},
  number       = {21},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Kinks in the σ Band of Graphene Induced by Electron-Phonon Coupling},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.111.216806},
  volume       = {111},
  year         = {2013},
}