Electronic structure and electron-phonon coupling of doped graphene layers in KC<sub>8</sub>
Physical Review B 79, 205106 - 9 (2009)
Electronic structure and electron-phonon coupling of doped graphene layers in KC8
We propose graphite intercalation compounds (GICs) as a material system with precisely the same electronic properties as doped few layer graphene. Despite the fact that GICs have been around for the last four decades, this fact has gone unnoticed so far. Especially we focus on the electronic energy bands of KC8 which corresponds to a doped graphene monolayer. We provide extensive theoretical and experimental evidendce for this claim employing a combined angle-resolved potoemission (ARPES) and theory approach using standard density-functional theory and including electron-electron correlation on a GW level. We observe a strong kink in the quasiparticle dispersion at 166 meV highlighting electron-phonon coupling to an in-plane TO phonon. These results are key for understanding, both, the unique electronic properties of graphene and superconductivity in KC8.
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- http://dx.doi.org/10.1103/PhysRevB.79.205106
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