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Based on the non-crossing approximation, we calculate both the linear andnonlinear conductance within the two-lead two-channel single-impurity Andersonmodel where the conduction electron density of states vanishes in a power-lawfashion $ \propto |\omega-\mu_F|^r$ with $r=1$ near the Fermi energy,appropriate for an hexagonal system. For given gate voltage, we address theuniversal crossover from a two-channel Kondo phase, argued to occur in dopedgraphene, to an unscreened local moment phase. We extract universal scalingfunctions in conductance governing charge transfer through the two-channelpseudogap Kondo impurity and discuss our results in the context of a recentscanning tunneling spectroscopy experiment on Co-doped graphene.

Gate-tuned two-channel Kondo screening by graphene leads: Universal scaling of the nonlinear conductance