Electronic correlations in transport through coupled quantum dots

TL;DR

This paper investigates how electronic correlations affect transport in coupled quantum dots, revealing complex conductance behaviors linked to the two-impurity Anderson model and the interplay of Kondo effect and magnetic exchange.

Contribution

It introduces a combined qualitative and quantitative analysis of conductance in coupled quantum dots, connecting experimental measurements to the phase diagram of the two-impurity Anderson model.

Findings

Conductance exhibits a two-plateau structure as a function of gate voltage.

Multiple peaks in conductance are observed depending on inter-dot tunneling.

The study highlights the competition between Kondo effect and magnetic exchange.

Abstract

The conductance through two quantum dots in series is studied using general qualitative arguments and quantitative slave-boson mean-field theory. It is demonstrated that measurements of the conductance can explore the phase diagram of the two-impurity Anderson model. Competition between the Kondo effect and the inter-dot magnetic exchange leads to a two-plateau structure in the conductance as a function of gate voltage and a two or three peak structure in the conductance vs. inter-dot tunneling.