Kondo Regime of a Quantum Dot Molecule: A Finite-U Slave-Boson Approach

TL;DR

This paper investigates the Kondo effect in a double quantum dot system using a finite-U slave-boson approach, revealing how level differences and configuration affect conductance and state symmetry.

Contribution

It introduces a finite-U slave-boson mean field method to analyze the Kondo regime in double quantum dots, providing new insights into conductance behavior and state symmetry effects.

Findings

Kondo tunneling is suppressed with increasing level difference in series configuration

Parallel configuration shows interplay between state symmetry and conductance

Results agree with other methods and deepen understanding of Kondo physics in double dots

Abstract

We study the electronic transport in a double quantum dot structure connected to leads in the Kondo regime for both series and parallel arrangements. By applying a finite-U slave boson technique in the mean field approximation we explore the effect of level degeneracy in the conductance through the system. Our results show that for the series connection, as the energy difference of the localized dot levels increases, the tunneling via the Kondo state is destroyed. For the parallel configuration, we find an interesting interplay of state symmetry and conductance. Our results are in good agrement with those obtained with other methods, and provide additional insights into the physics of the Kondo state in the double dot system.