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

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dc.creatorPark, Cheol-Hwan
dc.creatorGiustino, Feliciano
dc.creatorMcChesney, Jessica L.
dc.creatorBostwick, Aaron
dc.creatorOhta, Taisuke
dc.creatorRotenberg, Eli
dc.creatorCohen, Marvin L.
dc.creatorLouie, Steven G.
dc.date2008-03-28
dc.date.accessioned2026-07-07T09:29:07Z
dc.date.available2026-07-07T09:29:07Z
dc.descriptionWe 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.
dc.description5 pages 4 figures
dc.identifierhttps://arxiv.org/abs/0803.4031
dc.identifierhttp://arxiv.org/abs/0803.4031
dc.identifierPhys. Rev. B 77, 113410 (2008)
dc.identifierdoi:10.1103/PhysRevB.77.113410
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/157670
dc.subjectMaterials Science
dc.titleVan Hove Singularity and Apparent Anisotropy in the Electron-Phonon Interaction in Graphene
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