Cotunneling through quantum dot with even number of electrons

TL;DR

This paper investigates how a finite magnetic field affects a spin-degenerate quantum dot with an even number of electrons, revealing conditions where its low-energy behavior aligns with the S=1/2 antiferromagnetic Kondo model.

Contribution

It demonstrates that the low-energy physics of a quantum dot with even electrons under magnetic field can be effectively described by the Kondo model, under specific conditions.

Findings

Magnetic field influences quantum dot behavior.

Low-energy physics maps to the Kondo model.

Conditions identified for this mapping.

Abstract

We study an influence of a finite magnetic field on a small spin-degenerate quantum dot with even number of electrons, attached to metallic leads. It is shown that, under certain conditions, the low energy physics of the system can be described by the S=1/2 antiferromagnetic Kondo model.