A Tunable Kondo Effect in Quantum Dots

TL;DR

This paper demonstrates a tunable Kondo effect in quantum dots, showing how the Kondo temperature and behavior can be controlled by electron number and gate voltage, with results aligning with theoretical predictions.

Contribution

It introduces a method to tune the Kondo effect in quantum dots by adjusting electron number and gate voltage, providing experimental validation of theoretical models.

Findings

Kondo effect can be switched on and off by electron number.

Kondo temperature is tunable via gate voltage.

Experimental results agree with theoretical predictions.

Abstract

We demonstrate a tunable Kondo effect realized in small quantum dots. We can switch our dot from a Kondo impurity to a non-Kondo system as the number of electrons on the dot is changed from odd to even. We show that the Kondo temperature can be tuned by means of a gate voltage as a single-particle energy state nears the Fermi energy. Measurements of the temperature and magnetic field dependence of a Coulomb-blockaded dot show good agreement with predictions of both equilibrium and non-equilibrium Kondo effects.