Interpolative method for transport properties of quantum dots in the Kondo regime

TL;DR

This paper introduces an interpolative approach to model electron transport in quantum dots within the Kondo regime, accurately capturing behavior across weak and strong coupling limits and demonstrating the transition from Kondo to Coulomb blockade regimes.

Contribution

The paper develops a novel interpolative method for the electron self-energy that is exact in both weak and strong coupling limits, applicable to single and multilevel quantum dots.

Findings

Accurately describes the density of states in quantum dots.

Captures the transition from Kondo to Coulomb blockade regimes.

Shows temperature-dependent conductance behavior.

Abstract

We present an interpolative method for describing coherent transport through an interacting quantum dot. The idea of the method is to construct an approximate electron self-energy which becomes exact both in the limits of weak and strong coupling to the leads. The validity of the approximation is first checked for the case of a single (spin-degenerate) dot level. A generalization to the multilevel case is then discussed. We present results both for the density of states and the temperature dependent linear conductance showing the transition from the Kondo to the Coulomb blockade regime.