Universal scaling in nonequilibrium transport through an Anderson impurity

Abstract

Using nonequilibrium renormalized perturbation theory, we calculate the conductance $G$ as a function of temperature $T$ and bias voltage $V$ for an Anderson model suitable for describing transport properties through a quantum dot. For renormalized parameters that correspond to the extreme Kondo limit, we do not find a simple scaling formula beyond a quadratic dependence in $T$ and $V$. However, if valence fluctuations are allowed, we find excellent agreement with recent experiments.