Graphene

The extreme simplicity of its electronic structure has affirmed graphene as an ideal testbed for the demonstration of many-body effects on band structure. Within this context we have investigated: 1) the isotope substitution as an experimental tool to prove the electron-phonon coupling origin of sudden band slope change (known as kink) near the Fermi level; 2) highly doped graphene reaching almost the van-Hove singularity, to demonstrate that its apparent band flattening is just the unoccupied band spectral functional tails.