Ballistic spin transport through electronic stub tuners: spin precession, selection, and square-wave transmission

TL;DR

This paper investigates ballistic spin transport in electronic stub tuners, demonstrating spin precession, spin filtering, and square-wave transmission control through structural modifications and spin-orbit interaction tuning.

Contribution

It introduces a method to achieve controlled spin precession and transmission modulation using stub structures with tunable geometry and spin-orbit coupling.

Findings

Nearly square-wave spin transmission achieved with symmetric stubs.

Transmission gaps can be widened with asymmetric stubs.

Combining different spin-orbit strengths enhances modulation effects.

Abstract

Ballistic spin transport is studied through electronic tuners with double stubs attached to them. The spins precess due to the spin-orbit interaction. Injected polarized spins can exit the structure polarized in the opposite direction. A nearly square-wave spin transmission, with values 1 and 0, can be obtained using a periodic system of symmetric stubs and changing their length or width. The gaps in the transmission can be widened using asymmetric stubs. An additional modulation is obtained upon combining stub structures with different values of the spin-orbit strength.