Multistage Kondo effect in a multiterminal geometry: A modular quantum interferometer

TL;DR

This paper explores the multistage Kondo effect in a multiterminal quantum device, revealing how quantum interference from multiple resonance channels influences transport properties and can be controlled via device geometry.

Contribution

It provides a comprehensive theoretical framework for understanding the multistage Kondo effect in complex multiterminal nanostructures, highlighting interference effects and control mechanisms.

Findings

Interference causes destructive crosstalk between channels.

Tunneling junction manipulation controls the multistage Kondo effect.

Quantum interference significantly impacts transport observables.

Abstract

Quantum systems characterized by an interplay between several resonance scattering channels demonstrate very rich physics. To illustrate it we consider a multistage Kondo effect in nanodevices as a paradigmatic model for a multimode resonance scattering. We show that the channel crosstalk results in a destructive interference between the modes. This interplay can be controlled by manipulating the tunneling junctions in the multilevel and multiterminal geometry. We present a full-fledged theory of the multistage Kondo effect at the strong-coupling Fermi-liquid fixed point and discuss the influence of quantum interference effects to the quantum transport observables.