Screening of electron-phonon coupling in graphene on Ir(111)

Abstract

The phonon dispersion of graphene on Ir(111) has been determined by means of angle-resolved inelastic electron scattering and density functional calculations. Kohn anomalies of the highest optical-phonon branches are observed at the $\Gamma$ and K point of the surface Brillouin zone. At K the Kohn anomaly is weaker than observed from pristine graphene and graphite. This observation is rationalized in terms of a decrease of the electron-phonon coupling due to screening of graphene electron correlations by the metal substrate.

References in corpus (8)

• Electric Field Effect in Atomically Thin Carbon Films
• Two Dimensional Atomic Crystals
• Dirac Cones and Minigaps for Graphene on Ir(111)
• Non-adiabatic Kohn-anomaly in a doped graphene monolayer
• The phonon dispersion of graphite by inelastic x-ray scattering
• Impact of the electron-electron correlation on phonon dispersions: failure of LDA and GGA functionals in graphene and graphite
• Contribution of the buffer layer to the Raman spectrum of epitaxial graphene on SiC(0001)
• Doped graphene as tunable electron-phonon coupling material

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• Understanding and engineering phonon-mediated tunneling into graphene on metal surfaces
• Spectroscopic investigations of phonons in epitaxial graphene
• Impact of nuclear vibrations on van der Waals and Casimir interactions at zero and finite temperature