Spin-Polarized Transprot through Double Quantum Dots

TL;DR

This paper studies how spin-polarized electrons move through double quantum dots connected to ferromagnetic leads, revealing how tunneling strength affects conductance via Kondo resonances.

Contribution

It introduces a detailed analysis of spin-polarized transport in double quantum dots using the slave-boson mean-field approximation, highlighting the impact of lead polarization configurations.

Findings

Transport properties depend on tunneling strength between dots.

Kondo resonances influence conductance in different lead polarization setups.

Distinct behaviors observed for parallel and anti-parallel lead configurations.

Abstract

We investigate spin-polarized transport phenomena through double quantum dots coupled to ferromagnetic leads in series. By means of the slave-boson mean-field approximation, we calculate the conductance in the Kondo regime for two different configurations of the leads: spin-polarization of two ferromagnetic leads is parallel or anti-parallel. It is found that transport shows some remarkable properties depending on the tunneling strength between two dots. These properties are explained in terms of the Kondo resonances in the local density of states.