Proposal for a correlation induced spin-current polarizer

TL;DR

This paper introduces a quantum dot-based spin polarizer device that uses Coulomb interactions and gate voltage control to manipulate spin current polarization without external magnetic fields, considering temperature and bias effects.

Contribution

It presents a novel spin polarizer design leveraging Coulomb interactions and gate voltage control, eliminating the need for external magnetic fields.

Findings

Gate voltage can reverse or suppress initial spin polarization.

Temperature and bias influence the efficiency of spin switching.

Device operates without external magnetic fields.

Abstract

We propose a spin polarizer device composed of a quantum dot connected to the spin polarized leads. The spin control of the current flowing through the device is entirely due to the Coulomb interactions present inside the dot. We show that the initial polarization present in the source lead can be reverted or suppressed just by manipulating the gate voltage acting on the dot, the presence of the external magnetic field is not required. The influence of the temperature and finite bias on the efficiency of the current spin switching effect is also discussed.