Remote-control spin filtering through a $T$-type structure

TL;DR

This paper introduces a $T$-stub waveguide spin filter that uses a magnetic field and remote gating to control spin and electric currents, demonstrating robustness against disorder.

Contribution

It presents a novel $T$-structure spin filter design that allows remote electronic control of spin polarization and current direction.

Findings

Achieves large electric and spin currents with moderate magnetic fields.

Allows electronic tuning of spin polarization via remote gating.

Demonstrates robustness against disorder effects.

Abstract

We propose a spin filter scheme using a $T$-stub waveguide. By applying a moderate magnetic field at the tip of the sidearm, this device can produce both large electric and spin current. The direction, polarization of the output spin current can be further adjusted electronically by a remote gate which tunes the length of the sidearm. The device is robust against the disorder.