Kondo screening cloud effects in mesoscopic devices

TL;DR

This paper investigates how finite size effects influence the Kondo screening cloud in mesoscopic devices, affecting thermodynamic and transport properties, with theoretical analysis including perturbation, Fermi liquid, and slave boson methods.

Contribution

It provides a detailed theoretical analysis of finite size effects on the Kondo cloud in mesoscopic devices, including multi-channel wires, using multiple theoretical approaches.

Findings

Finite size effects significantly alter Kondo properties when device size matches the Kondo cloud.

Theoretical models predict measurable changes in thermodynamics and transport in mesoscopic Kondo systems.

Multi-channel wires exhibit complex behavior impacting Kondo screening.

Abstract

We study how finite size effects may appear when a quantum dot in the Kondo Coulomb blockade regime is embedded into a mesoscopic device with finite wires. These finite size effects appear when the size of the mesoscopic device containing the quantum dot is of the order of the size of Kondo cloud and affect all thermodynamic and transport properties of the Kondo quantum dot. We also generalize our results to the experimentally relevant case where the wires contain several transverse modes/channels. Our results are based on perturbation theory, Fermi liquid theory and slave boson mean field theory.