Physical origin of satellite in photoemission of doped graphene: An ab-initio GW plus cumulant study

Abstract

We calculate the photoemission spectra of suspended and epitaxial doped graphene using an ab initio cumulant expansion of the Green's function based on the GW self-energy. Our results are compared to experiment and to standard GW calculations. For doped graphene on a silicon carbide substrate, we find, in contrast to earlier calculations, that the spectral function from GW only does not reproduce experimental satellite properties. However, ab initio GW plus cumulant theory combined with an accurate description of the substrate screening results in good agreement with experiment, but gives no plasmaron (i.e., no extra well-defined excitation satisfying Dyson's equation).

5 pages, accepted to Phys. Rev. Lett

References in corpus (9)

• Electric Field Effect in Atomically Thin Carbon Films
• Substrate-induced band gap opening in epitaxial graphene
• Dielectric function, screening, and plasmons in 2D graphene
• Dynamical polarization of graphene at finite doping
• Ab initio Study of Graphene on SiC
• Origins of anomalous electronic structures of epitaxial graphene on silicon carbide
• The Role of Electron-electron Interactions in Graphene ARPES Spectra
• Plasmon-phonon coupling in graphene
• The quasiparticle spectral function in doped graphene

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