Van Hove singularity and apparent anisotropy in the electron-phonon interaction in graphene

Cheol-Hwan Park, Feliciano Giustino, Jessica L. McChesney, Aaron Bostwick, Taisuke Ohta, Eli Rotenberg, Marvin L. Cohen, and Steven G. Louie
Phys. Rev. B 77, 113410 – Published 27 March 2008

Abstract

We show that the electron-phonon coupling strength obtained from the slopes of the electronic energy vs wave vector dispersion relations, as often done in analyzing angle-resolved photoemission data, can differ substantially from the actual electron-phonon coupling strength due to the curvature of the bare electronic bands. This effect becomes particularly important when the Fermi level is close to a van Hove singularity. By performing ab initio calculations on doped graphene, we demonstrate that, while the apparent strength obtained from the slopes of experimental photoemission data is highly anisotropic, the angular dependence of the actual electron-phonon coupling strength in this material is negligible.

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  • Received 21 February 2008

DOI:https://doi.org/10.1103/PhysRevB.77.113410

©2008 American Physical Society

Authors & Affiliations

Cheol-Hwan Park1,2,*, Feliciano Giustino1,2, Jessica L. McChesney3, Aaron Bostwick3, Taisuke Ohta3, Eli Rotenberg3, Marvin L. Cohen1,2, and Steven G. Louie1,2

  • 1Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
  • 2Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 3Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

  • *cheolwhan@civet.berkeley.edu

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Issue

Vol. 77, Iss. 11 — 15 March 2008

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