Spin-polarized quantum transport through a T-shape quantum dot-array: a model of spin splitter

TL;DR

This paper presents a theoretical study of spin-polarized quantum transport in a T-shaped quantum dot array, demonstrating tunable spin currents and the potential for spin splitting using magnetic fields.

Contribution

It introduces a model for a spin splitter based on a T-shaped quantum dot array with tunable spin-polarized transport via magnetic fields.

Findings

Spin-polarized transmission probabilities are tunable by energy and magnetic field orientation.

Opposite spin polarization currents can be generated and directed to different electrodes.

The system functions as a controllable spin splitter.

Abstract

We in this paper study theoretically the spin-polarized quantum transport through a T-shape quantum dot-array by means of transfer-matrix method along with the Green^{,}s function technique. Multi-magnetic fields are used to produce the spin-polarized transmission probabilities and therefore the spin currents, which are shown to be tunable in a wide range by adjusting the energy, and the direction-angle of magnetic fields as well. Particularly the opposite- spin- polarization currents separately flowing out to two electrodes can be generated and thus the system acts as a spin splitter.