Spectroscopic analysis of finite size effects around a Kondo quantum dot

TL;DR

This paper investigates how the size of a quantum box influences the Kondo effect around a quantum dot, providing a spectroscopic method to measure finite-size effects related to the Kondo screening cloud.

Contribution

It introduces a setup with a quantum dot connected to a finite size box and metallic reservoirs, enabling detailed spectroscopic analysis of finite-size effects on the Kondo cloud.

Findings

Finite size of the box affects the formation of the Kondo screening cloud.

Transport measurements can reveal finite-size effects on the Kondo phenomenon.

The setup allows easier access to the Kondo cloud's spatial extension.

Abstract

We consider a simple setup in which a small quantum dot is strongly connected to a finite size box. This box can be either a metallic box or a finite size quantum wire.The formation of the Kondo screening cloud in the box strongly depends on the ratio between the Kondo temperature and the box level spacing. By weakly connecting two metallic reservoirs to the quantum dot, a detailed spectroscopic analysis can be performed. Since the transport channels and the screening channels are almost decoupled, such a setup allows an easier access to the measure of finite-size effects associated with the finite extension of the Kondo cloud.