Spin-polarized Andreev transport influenced by Coulomb repulsion through two quantum dot system

TL;DR

This paper theoretically investigates how ferromagnetic electrodes and Coulomb interactions influence spin-polarized Andreev transport in a double quantum dot system connected to a superconductor.

Contribution

It provides a detailed analysis of the combined effects of ferromagnetism and Coulomb repulsion on Andreev tunneling in a double quantum dot setup.

Findings

Ferromagnetism significantly affects Andreev tunneling processes.

Coulomb interaction modifies the balance between direct and crossed Andreev processes.

The study offers insights into controlling spin-polarized transport in quantum dot systems.

Abstract

Spin-polarized transport through a double quantum dot system attached to a common superconducting lead and two ferromagnetic electrodes (fork geometry) is investigated theoretically. The key objective of the analysis is to describe the influence of electrodes' ferromagnetism on the Andreev tunneling. Both direct and crossed Andreev tunneling processes are considered, in general. The other objective is a detailed analysis of the role of Coulomb interaction and its impact on the Andreev tunneling processes.