Kondo-Dicke resonances in electronic transport through triple quantum dots

TL;DR

This paper investigates how Kondo and Dicke effects influence electronic transport in a triple quantum dot system, revealing mode transitions and transport characteristics in the Kondo regime.

Contribution

It introduces a theoretical model combining Kondo physics with Dicke-like resonances in triple quantum dots, highlighting mode transitions and transport behavior.

Findings

Transition from subradiant to superradiant modes observed

Spectral function shows Dicke-like resonance effects

Bias dependence of conductance and shot noise analyzed

Abstract

Electronic transport through a triple quantum dot system, with only a single dot coupled directly to external leads, is considered theoretically. The model includes Coulomb correlations in the central dot, while such correlations in the two side-coupled dots are omitted. The infinite-U mean-field slave-boson approach is used to obtain basic transport characteristics in the Kondo regime. When tuning position of the side-coupled dots' levels, transition from subradiant to superradiant like mode (and vice versa) has been found in the spectral function, in analogy to the Dicke effect in atomic physics. Bias dependence of the differential conductance and zero frequency shot noise is also analysed.