Quantum criticality of the two-channel pseudogap Anderson model: Universal scaling in linear and non-linear conductance

Abstract

The quantum criticality of the two-lead two-channel pseudogap Anderson model is studied. Based on the non-crossing approximation, we calculate both the linear and nonlinear conductance of the model at finite temperatures with a voltage bias and a power-law vanishing conduction electron density of states, $\propto |\omega -{\mu }_F{|}^r$ ($0<r<1$) near the Fermi energy. Equilibrium and non-equilibrium quantum critical properties at the two-channel Kondo (2CK) to local moment (LM) phase transition are addressed by extracting universal scaling functions in both linear and non-linear conductances, respectively. Clear distinctions are found on the critical exponents between linear and non-linear conductance. The implications of these two distinct quantum critical properties for the non-equilibrium quantum criticality in general are discussed.

8 pages, 9 figures

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Cited by in corpus (1)

• Nonequilibrium Kondo effect in a graphene-coupled quantum dot in the presence of a magnetic field