Van Hove Singularity and Apparent Anisotropy in the Electron-Phonon Interaction in Graphene - Condensed Matter > Materials ScienceReport as inadecuate




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Abstract: We show that the electron-phonon coupling strength obtained from the slopesof the electronic energy vs. wavevector dispersion relations, as often done inanalyzing angle-resolved photoemission data, can differ substantially from theactual electron-phonon coupling strength due to the curvature of the bareelectronic bands. This effect becomes particularly important when the Fermilevel is close to a van Hove singularity. By performing {\it ab initio}calculations on doped graphene we demonstrate that, while the apparent strengthobtained from the slopes of experimental photoemission data is highlyanisotropic, the angular dependence of the actual electron-phonon couplingstrength in this material is negligible.



Author: Cheol-Hwan Park, Feliciano Giustino, Jessica L. McChesney, Aaron Bostwick, Taisuke Ohta, Eli Rotenberg, Marvin L. Cohen, Steven G

Source: https://arxiv.org/







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