Kondo effect in a one-electron double quantum dot: Oscillations of the Kondo current in a weak magnetic field

TL;DR

This paper reports on the observation of oscillations in the Kondo conductance of a double quantum dot system with one electron, caused by a weak magnetic field, highlighting potential for quantum information applications.

Contribution

It demonstrates a novel oscillatory behavior of the Kondo effect in a double quantum dot under weak magnetic fields, with implications for quantum control.

Findings

Oscillations of Kondo conductance with magnetic field |B| 50mT

Fine tuning of energy mismatch between quantum dot levels affects conductance

Potential applications in quantum information processing

Abstract

We present transport measurements of the Kondo effect in a double quantum dot charged with only one or two electrons, respectively. For the one electron case we observe a surprising quasi-periodic oscillation of the Kondo conductance as a function of a small perpendicular magnetic field |B| \lesssim 50mT. We discuss possible explanations of this effect and interpret it by means of a fine tuning of the energy mismatch of the single dot levels of the two quantum dots. The observed degree of control implies important consequences for applications in quantum information processing.