Anomalous Kondo effect of indirectly coupled double quantum dots

TL;DR

This paper theoretically explores how quantum interference affects the Kondo effect in double quantum dots connected via a quantum wire, revealing different resonance behaviors and conductance variations depending on system parameters.

Contribution

It introduces a theoretical model showing how quantum interference modulates the Kondo effect in indirectly coupled double quantum dots, predicting novel resonance phenomena.

Findings

Identification of true bound Kondo states.

Prediction of anomalous Kondo resonances affecting conductance.

Dependence of Kondo behavior on the parameter $k_F L$.

Abstract

We report theoretical investigations of indirectly coupled double quantum dots (QD) side connected to an one-dimensional quantum wire. Due to quantum interference controlled by the parameter $k_F L$, with $k_F$ the Fermi wave number of the wire and $L$ the distance between the two QDs, distinctly different Kondo resonances are predicted depending on the range of $k_F L$. A true bound Kondo states is found while an anomalous Kondo resonance gives rise to both reduction and enhancement of conductance.