Electron-Phonon Coupling in Highly-Screened Graphene

Abstract

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.

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

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• Colloquium: Graphene spectroscopy
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• Direct determination of mode-projected electron-phonon coupling in the time-domain
• Phonon driven Floquet matter
• Two-gap superconductivity in heavily n-doped graphene: ab initio Migdal-Eliashberg theory
• Charge-Carrier Screening in Single-Layer Graphene
• Enhanced electron-phonon coupling in graphene with periodically distorted lattice
• Ytterbium-driven strong enhancement of electron-phonon coupling in graphene
• Correlation-Driven Electron-Hole Asymmetry in Graphene Field Effect Devices
• Electron-polaron--electron-polaron bound states in mass-gap graphene-like planar quantum electrodynamics: $s$-wave bipolarons
• On the electron-polaron--electron-polaron scattering and Landau levels in pristine graphene-like quantum electrodynamics
• Enhancement of gaps in thin graphitic films for heterostructure formation
• Concomitant enhancement of electron-phonon coupling and electron-electron interaction in graphene decorated with ytterbium
• The quantum scale invariance in graphene-like quantum electrodynamics
• Ultrafast dynamics of electron-phonon coupling in a metal
• Tunable Kondo resonance at a pristine two-dimensional Dirac semimetal on a Kondo insulator