Kondo cloud conductance in cavity-coupled quantum dots with asymmetric barriers

TL;DR

This study investigates the spatial extent and properties of the Kondo screening cloud in a quantum dot system, revealing how cavity coupling and reservoir asymmetry influence conductance and Kondo behavior.

Contribution

It introduces a novel experimental setup combining a quantum dot with a Fabry-Pérot interferometer to probe the Kondo cloud and its dependence on coupling asymmetry.

Findings

Kondo temperature oscillations suggest a screening length comparable to cavity size

Coupling asymmetry affects conductance oscillation amplitude and phase

Evidence of interplay between coherent transport and Kondo effect

Abstract

The Kondo effect emerges when a localized spin is screened by conduction electrons, giving rise to a strongly-correlated many-body ground state. In this work, we investigate this phenomenon in a GaAs/AlGaAs quantum dot, focusing on the spatial extension of the Kondo screening cloud in the electron reservoirs. To probe its properties, the dot is coupled to an electronic Fabry-P\'erot interferometer, enabling controlled modulation of the density of states at the Fermi level. The observation of Kondo temperature oscillations indicates a Kondo screening length comparable to the cavity size. Furthermore, we explore how the coupling asymmetry with the two reservoirs affects both the amplitude and the phase of the conductance oscillations, revealing a subtle interplay between coherent transport and Kondo effect.