Electron-Phonon Coupling in Highly-Screened Graphene

Details Electron-Phonon Coupling in Highly-Screened Graphene Electron-Phonon Coupling in Highly-Screened Graphene

2011-08-12

arxiv.org/abs/1108.2566v1

Physics

Condensed Matter

Materials Science

Submitted to Phys. Rev. Lett. on July 20, 2011

Scientific paper

Photoemission studies of graphene have resulted in a long-standing controversy concerning the strength of the experimental electron-phonon interaction in comparison with theoretical calculations. Using high-resolution angle-resolved photoemission spectroscopy we study graphene grown on a copper substrate, where the metallic screening of the substrate substantially reduces the electron-electron interaction, simplifying the comparison of the electron-phonon interaction between theory and experiment. By taking the nonlinear bare bandstructure into account, we are able to show that the strength of the electron-phonon interaction does indeed agree with theoretical calculations. In addition, we observe a significant bandgap at the Dirac point of graphene.

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