Correlations of spin currents through a quantum dot induced by the Kondo effect

TL;DR

This paper investigates how spin current correlations in a quantum dot emerge due to the Kondo effect, highlighting non-perturbative phenomena and their relation to Kondo physics in quantum dots.

Contribution

It reveals the development of spin current correlations in the Kondo regime and demonstrates their non-perturbative nature in the Kondo coupling.

Findings

Spin current correlations vanish in elastic co-tunneling.

Correlations develop as the quantum dot enters the Kondo regime.

The spin current correlator is non-perturbative in the Kondo coupling.

Abstract

We study correlations of spin currents flowing through a Coulomb blockaded quantum dot. While vanishing for elastic co-tunneling, these correlations develop as the quantum dot enters the Kondo regime. They are a manifestation of Kondo physics in quantum dots. We demonstrate that the spin current correlator is non-perturbative in the Kondo coupling.