Leading temperature dependence of the conductance in Kondo-correlated quantum dots

TL;DR

This paper derives an analytical expression for the leading temperature dependence of conductance in Kondo-correlated quantum dots using renormalized perturbation theory, showing excellent agreement with numerical results.

Contribution

It introduces a new analytical approach based on renormalized perturbation theory for the temperature dependence of conductance in quantum dots, outperforming previous perturbative methods.

Findings

Analytical expression matches numerical results closely.

Method outperforms alternative perturbative approaches.

Good agreement with literature data.

Abstract

Using renormalized perturbation theory in the Coulomb repulsion, we derive an analytical expression for the leading term in the temperature dependence of the conductance through a quantum dot described by the impurity Anderson model, in terms of the renormalized parameters of the model. Taking these parameters from the literature, we compare the results with published ones calculated using the numerical renormalization group obtaining a very good agreement. The approach is superior to alternative perturbative treatments. We compare in particular to the results of a simple interpolative perturbation approach.