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Universal scaling of nonlinear conductance in the two-channel pseudogap Anderson model: Application for gate-tuned Kondo effect in magnetically doped graphene

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Kirchner,  S.
Stefan Kirchner, cross-PKS/CPfS theory group, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Lee, T.-H., Zhang, K.-Y.-J., Chung, C.-H., & Kirchner, S. (2013). Universal scaling of nonlinear conductance in the two-channel pseudogap Anderson model: Application for gate-tuned Kondo effect in magnetically doped graphene. Pysical Review B, 88(8): 085431, pp. 085431-1-085431-7. doi:10.1103/PhysRevB.88.085431.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-1E70-2
Abstract
Based on the noncrossing approximation, we calculate both the linear and nonlinear conductance within the two-lead two-channel single-impurity Anderson model where the conduction electron density of states vanishes in a power-law fashion proportional to vertical bar omega - mu(F)vertical bar(r) with r = 1 near the Fermi energy, appropriate for a hexagonal system. For given gate voltage, we address the universal crossover from a two-channel Kondo phase, argued to occur in doped graphene, to an unscreened local moment phase. We extract universal scaling functions in conductance governing charge transfer through the two-channel pseudogap Kondo impurity and discuss our results in the context of a recent scanning tunneling spectroscopy experiment on Co-doped graphene.