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We calculate the photoemission spectra of suspended and epitaxial dopedgraphene using an ab initio cumulant expansion of the Green's function based onthe GW self-energy. Our results are compared to experiment and to standard GWcalculations. For doped graphene on a silicon carbide substrate, we find, incontrast to earlier calculations, that the spectral function from GW only doesnot reproduce experimental satellite properties. However, ab initio GW pluscumulant theory combined with an accurate description of the substratescreening results in good agreement with experiment, but gives no plasmaron(i.e., no extra well-defined excitation satisfying Dyson's equation).

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