Kondo effect in a double quantum-dot molecule under the effect of an electric and magnetic field

TL;DR

This paper investigates how magnetic and electric fields influence electron tunneling and conductance in a double quantum dot system within the Kondo regime, revealing complex multistability behaviors.

Contribution

It introduces a mean-field slave-boson approach to analyze the effects of external fields on Kondo phenomena in double quantum dots, highlighting controllable multistability regions.

Findings

Presence of tristable conductance solutions under external fields

Interdot coupling and fields can tune multistability regions

Demonstrates control of quantum dot behavior via external parameters

Abstract

Electron tunneling through a double quantum dot molecule, in the Kondo regime, under the effect of a magnetic field and an applied voltage, is studied. This system possesses a complex response to the applied fields characterized by a tristable solution for the conductance. The different nature of the solutions are studied in and out thermodynamical equilibrium. It is shown that the interdot coupling and the fields can be used to control the region of multistability. The mean-field slave-boson formalism is used to obtain the solution of the problem.