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Anisotropic Eliashberg function and electron-phonon coupling in doped graphene

Haberer, D. ; Petaccia, L. ; Fedorov, A. V. ; Praveen, C. S. ; Fabris, S. ; Piccinin, S. ; Vilkov, O. ; Vyalikh, D. V. ; Preobrajenski, Alexei LU and Verbitskiy, N. I. , et al. (2013) In Physical Review B (Condensed Matter and Materials Physics) 88(8).
Abstract
We investigate, with high-resolution angle-resolved photoemission spectroscopy, the spectral function of potassium-doped quasi-free-standing graphene on Au. Angle-dependent x-ray photoemission and density functional theory calculations demonstrate that potassium intercalates into the graphene/Au interface, leading to an upshift of the K-derived electronic band above the Fermi level. This empty band is what makes this system perfectly suited to disentangle the contributions to electron-phonon coupling coming from the pi band and K-derived bands. From a self-energy analysis we find an anisotropic electron-phonon coupling strength lambda of 0.1 (0.2) for the K Gamma (K M) high-symmetry directions in momentum space, respectively.... (More)
We investigate, with high-resolution angle-resolved photoemission spectroscopy, the spectral function of potassium-doped quasi-free-standing graphene on Au. Angle-dependent x-ray photoemission and density functional theory calculations demonstrate that potassium intercalates into the graphene/Au interface, leading to an upshift of the K-derived electronic band above the Fermi level. This empty band is what makes this system perfectly suited to disentangle the contributions to electron-phonon coupling coming from the pi band and K-derived bands. From a self-energy analysis we find an anisotropic electron-phonon coupling strength lambda of 0.1 (0.2) for the K Gamma (K M) high-symmetry directions in momentum space, respectively. Interestingly, the high-energy part of the Eliashberg function which relates to graphene's optical phonons is equal in both directions but only in K M does an additional low-energy part appear. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
88
issue
8
publisher
American Physical Society
external identifiers
  • wos:000322785000001
  • scopus:84884506881
ISSN
1098-0121
DOI
10.1103/PhysRevB.88.081401
language
English
LU publication?
yes
id
0ec06523-d987-43c0-ac67-b10ab04fedba (old id 4042684)
date added to LUP
2016-04-01 15:02:07
date last changed
2022-02-19 22:09:48
@article{0ec06523-d987-43c0-ac67-b10ab04fedba,
  abstract     = {{We investigate, with high-resolution angle-resolved photoemission spectroscopy, the spectral function of potassium-doped quasi-free-standing graphene on Au. Angle-dependent x-ray photoemission and density functional theory calculations demonstrate that potassium intercalates into the graphene/Au interface, leading to an upshift of the K-derived electronic band above the Fermi level. This empty band is what makes this system perfectly suited to disentangle the contributions to electron-phonon coupling coming from the pi band and K-derived bands. From a self-energy analysis we find an anisotropic electron-phonon coupling strength lambda of 0.1 (0.2) for the K Gamma (K M) high-symmetry directions in momentum space, respectively. Interestingly, the high-energy part of the Eliashberg function which relates to graphene's optical phonons is equal in both directions but only in K M does an additional low-energy part appear.}},
  author       = {{Haberer, D. and Petaccia, L. and Fedorov, A. V. and Praveen, C. S. and Fabris, S. and Piccinin, S. and Vilkov, O. and Vyalikh, D. V. and Preobrajenski, Alexei and Verbitskiy, N. I. and Shiozawa, H. and Fink, J. and Knupfer, M. and Buechner, B. and Grueneis, A.}},
  issn         = {{1098-0121}},
  language     = {{eng}},
  number       = {{8}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B (Condensed Matter and Materials Physics)}},
  title        = {{Anisotropic Eliashberg function and electron-phonon coupling in doped graphene}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.88.081401}},
  doi          = {{10.1103/PhysRevB.88.081401}},
  volume       = {{88}},
  year         = {{2013}},
}