Kondo effect in double quantum dots with inter-dot repulsion

TL;DR

This paper explores how inter-dot tunneling and capacitive coupling in a double quantum dot system influence the competition between Kondo and singlet phases, providing a detailed phase diagram.

Contribution

It presents a numerical analysis of the interplay between Kondo effects and local singlet phases in double quantum dots with inter-dot interactions.

Findings

Identification of phase boundaries between Kondo and singlet states

Quantitative phase diagram of the system

Insights into spin and charge degree competition

Abstract

We investigate a symmetrical double quantum dot system serially attached to the leads. The emphasis is on the numerical analysis of finite inter-dot tunneling in the presence of inter-dot repulsive capacitive coupling. The results reveal the competition between extended Kondo phases and local singlet phases in spin and charge degrees of freedom. The corresponding phase diagram is determined quantitatively.