The electron-phonon coupling in potassium-doped graphene on Ir(111) is studied via the renormalization of the π^ band near the Fermi level, using angle-resolved photoemission spectroscopy. The renormalization is found to be fairly weak and almost isotropic, with a mass enhancement parameter of λ=0.28(6) for both the K̄-M̄ and the K̄-Γ direction. These results are found to agree well with recent first-principles calculations.
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Bianchi et al. (2010) studied this question.
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