Quantum antidot as a controllable spin injector and spin filter

TL;DR

This paper proposes a quantum antidot device embedded in a quantum wire that can inject and control spin-polarized currents using resonant backscattering and Zeeman splitting, with detailed quantum transport analysis.

Contribution

It introduces a novel device design utilizing an antidot in a quantum wire for controllable spin injection and filtering, supported by quantum-mechanical transport calculations.

Findings

The device can effectively inject spin-polarized currents.

Resonant backscattering enables control over spin transport.

Zeeman splitting enhances spin filtering capabilities.

Abstract

We propose a device based on an antidot embedded in a narrow quantum wire in the edge state regime, that can be used to inject and/or to control spin polarized current. The operational principle of the device is based on the effect of resonant backscattering from one edge state into another through a localized quasi-bound states, combined with the effect of Zeeman splitting of the quasibound states in sufficiently high magnetic field. We outline the device geometry, present detailed quantum-mechanical transport calculation and suggest a possible scheme to test the device performance and functionality.