Van Hove Singularity and Apparent Anisotropy in the Electron-Phonon Interaction in Graphene

Details Van Hove Singularity and Apparent Anisotropy in the Electron-Phonon Interaction in Graphene Van Hove Singularity and Apparent Anisotropy in the Electron-Phonon Interaction in Graphene

2008-03-28

arxiv.org/abs/0803.4031v1

Phys. Rev. B 77, 113410 (2008)

Physics

Condensed Matter

Materials Science

5 pages 4 figures

Scientific paper

10.1103/PhysRevB.77.113410

We show that the electron-phonon coupling strength obtained from the slopes of the electronic energy vs. wavevector 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 {\it 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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