Spin filtering through a double-bend structure

TL;DR

This paper proposes a simple double-bend quantum wire structure that acts as an efficient spin filter, producing highly spin-polarized currents due to resonant effects, and demonstrates its robustness.

Contribution

It introduces a novel double-bend design for spin filtering in quantum wires using weak magnetic potentials, highlighting its high efficiency and robustness.

Findings

Achieves large spin-polarized currents in micro-Amperes.

Utilizes resonant behavior from double bends for effective filtering.

Demonstrates robustness of the spin filter design.

Abstract

We propose a simple scheme for the spin filter by studying the coherent transport of electrons through a double-bend structure in a quantum wire with a weak lateral magnetic potential which is much weaker than the Fermi energy of the leads. {\em Extremely large} spin polarized current in the order of {\em micro-Ampere} can be obtained because of the strong resonant behavior from the double bends. Further study suggests the roubustness of this spin filter.