Kondo-temperature dependence of the Kondo splitting in a single-electron transistor

TL;DR

This study investigates how the Kondo peak in a single-electron transistor varies with magnetic field and temperature, revealing deviations from theoretical predictions in the Kondo splitting behavior.

Contribution

It provides experimental insights into the Kondo temperature dependence of the Kondo splitting, highlighting discrepancies with existing theoretical models.

Findings

Kondo splitting decreases logarithmically with Kondo temperature

Existence of a critical magnetic field Bc below which the Kondo peak does not split

Observed prefactor of the logarithm is larger and B-independent, contrary to theory

Abstract

A Kondo peak in the differential conductance of a single-electron transistor is measured as a function of both magnetic field and the Kondo temperature. We observe that the Kondo splitting decreases logarithmically with Kondo temperature and that there exists a critical magnetic field Bc below which the Kondo peak does not split, in qualitative agreement with theory. However, we find that the magnitude of the prefactor of the logarithm is larger than predicted and is independent of B, in contradiction with theory. Our measurements also suggest that the value of Bc is smaller than predicted.