Kondo Temperature in Multilevel Quantum Dots

TL;DR

This paper presents a new method to calculate the Kondo temperature in multilevel quantum dots, showing it can be significantly increased when energy levels are closely spaced, and suggests an experiment to verify this.

Contribution

The authors introduce a general approach for evaluating Kondo temperature in multilevel quantum dots, highlighting the impact of energy-level spacing on Kondo effects.

Findings

Kondo temperature is strongly enhanced when intradot energy levels are closely spaced.

The developed theory provides a quantitative tool for predicting Kondo behavior in complex quantum dots.

An experimental setup is proposed to measure the size dependence of the Kondo temperature.

Abstract

We develop a general method to evaluate the Kondo temperature in a multilevel quantum dot that is weakly coupled to conducting leads. Our theory reveals that the Kondo temperature is strongly enhanced when the intradot energy-level spacing is comparable to or smaller than the charging energy. We propose an experiment to test our result, which consists of measuring the size-dependence of the Kondo temperature.