Anisotropic Eliashberg function and electron-phonon coupling in doped graphene
(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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https://lup.lub.lu.se/record/4042684
- author
- organization
- publishing date
- 2013
- 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}}, }