Kondo effects and shot noise enhancement in a laterally coupled double quantum dot

TL;DR

This paper investigates the Kondo effects and shot noise in a laterally coupled double quantum dot, revealing how coherent indirect coupling influences spin and orbital Kondo phenomena and their experimental signatures.

Contribution

It introduces the concept of a novel antiferromagnetic exchange coupling generated by coherent indirect coupling, affecting the spin Kondo effect in double quantum dots.

Findings

Coherent indirect coupling suppresses the spin Kondo effect when each dot has one electron.

Shot noise measurements can reveal the pseudospin Kondo effect.

A new antiferromagnetic exchange coupling influences Kondo phenomena.

Abstract

The spin and orbital Kondo effects and the related shot noise for a laterally coupled double quantum dot are studied taking account of coherent indirect coupling via a reservoir. We calculate the linear conductance and shot noise for various charge states to distinguish between the spin and orbital Kondo effects. We find that a novel antiferromagnetic exchange coupling can be generated by the coherent indirect coupling, and it works to suppress the spin Kondo effect when each quantum dot holds just one electron. We also show that we can capture the feature of the pseudospin Kondo effect from the shot noise measurement.