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Anisotropic Eliashberg function and electron-phonon coupling in doped graphene

In English

Författare

  • D. Haberer
  • L. Petaccia
  • A. V. Fedorov
  • C. S. Praveen
  • S. Fabris
  • S. Piccinin
  • O. Vilkov
  • D. V. Vyalikh
  • Alexei Preobrajenski
  • N. I. Verbitskiy
  • H. Shiozawa
  • J. Fink
  • M. Knupfer
  • B. Buechner
  • A. Grueneis
Visa allt

Summary, in English

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.

Publiceringsår

2013

Språk

Engelska

Publikation/Tidskrift/Serie

Physical Review B (Condensed Matter and Materials Physics)

Volym

88

Issue

8

Dokumenttyp

Artikel i tidskrift

Förlag

American Physical Society

Ämne

  • Natural Sciences
  • Physical Sciences

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1098-0121