Thermoelectric characterization of the Kondo resonance in nanowire quantum dots

TL;DR

This paper experimentally investigates the thermoelectric properties of Kondo correlated quantum dots in nanowires, confirming theoretical predictions about polarity changes in thermoelectric current influenced by temperature and magnetic field.

Contribution

It provides high-quality experimental data on thermoelectric effects in Kondo quantum dots, validating theoretical models and demonstrating control over thermoelectric current polarity.

Findings

Kondo correlations can induce polarity change in thermoelectric current.

Polarity can be reversed by increasing temperature or applying a magnetic field.

Experimental data aligns with theoretical predictions.

Abstract

We experimentally verify hitherto untested theoretical predictions about the thermoelectric properties of Kondo correlated quantum dots (QDs). The specific conditions required for this study are obtained by using QDs epitaxially grown in nanowires, combined with a recently developed method for controlling and measuring temperature differences at the nanoscale. This makes it possible to obtain data of very high quality both below and above the Kondo temperature, and allows a quantitative comparison with theoretical predictions. Specifically, we verify that Kondo correlations can induce a polarity change of the thermoelectric current, which can be reversed either by increasing the temperature or by applying a magnetic field.