Scaling of the Kondo zero bias peak in a hole quantum dot at finite temperatures

TL;DR

This study investigates how the zero bias conductance peak in a hole quantum dot scales with bias and temperature, comparing experimental results with theoretical models to understand Kondo physics at finite temperatures.

Contribution

It provides a detailed comparison between experimental data and real-time renormalization group calculations for the Kondo zero bias peak at finite temperatures.

Findings

Experimental data deviates from T=0 calculations at low bias.

Finite T calculations match experimental data well.

Kondo temperature estimates vary depending on the calculation method.

Abstract

We have measured the zero bias peak in differential conductance in a hole quantum dot. We have scaled the experimental data with applied bias and compared to real time renormalization group calculations of the differential conductance as a function of source-drain bias in the limit of zero temperature and at finite temperatures. The experimental data show deviations from the T=0 calculations at low bias, but are in very good agreement with the finite T calculations. The Kondo temperature T_K extracted from the data using T=0 calculations, and from the peak width at 2/3 maximum, is significantly higher than that obtained from finite T calculations.