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We have studied the effect of dynamical correlations on the electronicstructure of single Co adatoms on graphene monolayers with a recently developednovel method for nanoscopic materials that combines density functionalcalculations with a fully dynamical treatment of the strongly interacting3d-electrons. The coupling of the Co 3d-shell to the graphene substrate andhence the dynamic correlations are strongly dependent on the orbital symmetryand the system parameters (temperature, distance of the adatom from thegraphene sheet, gate voltage). When the Kondo effect takes place, we find thatthe dynamical correlations give rise to strongly temperature-dependent peaks inthe Co 3d-spectra near the Fermi level. Moreover, we find that the Kondo effectcan be tuned by the application of a gate voltage. It turns out that theposition of the Kondo peaks is pinned to the Dirac points of graphene ratherthan to the chemical potential.

Orbital selective and tunable Kondo effect of magnetic adatoms on graphene: Correlated electronic structure calculations