Enhanced spin Hall effect by tuning antidot potential: Proposal for a spin filter

TL;DR

This paper proposes a tunable antidot-based spin filter on semiconductor heterostructures that enhances the extrinsic spin Hall effect through resonant scattering, achieving over 50% spin filtering efficiency.

Contribution

It introduces a novel spin filter design utilizing tunable antidot potentials to significantly improve spin filtering via resonant scattering effects.

Findings

Spin filter efficiency exceeds 50% when tuning to resonance.

Resonant scattering enhances extrinsic spin Hall effect.

Tunable antidot potential controls spin filtering performance.

Abstract

We propose an efficient spin filter including an antidot fabricated on semiconductor heterostructures with strong spin-orbit interaction. The antidot creates a tunable potential on two-dimensional electron gas in the heterostructures, which may be attractive as well as repulsive. Our idea is based on the enhancement of extrinsic spin Hall effect by resonant scattering when the attractive potential is properly tuned. Numerical studies for three- and four-terminal devices indicate that the efficiency of the spin filter can be more than 50% by tuning the potential to the resonant condition.