Probing a Kondo correlated quantum dot with spin spectroscopy

TL;DR

This paper explores the interplay of Kondo effect and spin blockade in a quantum dot under varying magnetic fields, revealing insights into its internal spin configuration and challenging regular orbital filling assumptions.

Contribution

It introduces a combined analysis of Kondo and spin blockade effects to probe the internal spin structure of a quantum dot, suggesting spin-polarized filling as a likely scenario.

Findings

Kondo effect dominates at low magnetic fields

Spin blockade appears at higher fields

Evidence suggests spin-polarized orbital filling

Abstract

We investigate Kondo effect and spin blockade observed on a many-electron quantum dot and study the magnetic field dependence. At lower fields a pronounced Kondo effect is found which is replaced by spin blockade at higher fields. In an intermediate regime both effects are visible. We make use of this combined effect to gain information about the internal spin configuration of our quantum dot. We find that the data cannot be explained assuming regular filling of electronic orbitals. Instead spin polarized filling seems to be probable.