Interference Effects on Kondo-Assisted Transport through Double Quantum Dots

TL;DR

This paper explores how interference effects influence Kondo-assisted electron transport in double quantum dots, analyzing conductance and density of states across different configurations and including ferromagnetic lead impacts.

Contribution

It provides a systematic analysis of interference effects on Kondo transport in double quantum dots using slave-boson mean-field approximation, covering various geometries and spin-polarization effects.

Findings

Conductance varies with system configuration due to interference-induced Kondo resonances.

Transport properties are significantly affected by the geometry of the double quantum dots.

Spin-polarization of leads modifies the Kondo resonance and conductance behavior.

Abstract

We systematically investigate electron transport through double quantum dots with particular emphasis on interference induced via multiple paths of electron propagation. By means of the slave-boson mean-field approximation, we calculate the conductance, the local density of states, the transmission probability in the Kondo regime at zero temperature. It is clarified how the Kondo-assisted transport changes its properties when the system is continuously changed among the serial, parallel and T-shaped double dots. The obtained results for the conductance are explained in terms of the Kondo resonances influenced by interference effects. We also discuss the impacts due to the spin-polarization of ferromagnetic leads.