Precessionless spin transport wire confined in quasi-two-dimensional electron systems

TL;DR

This paper proposes a method to achieve precessionless spin transport in a quasi-two-dimensional electron system by identifying specific directions where spin precession is suppressed, enabling nearly conserved spin states for spintronics applications.

Contribution

The study demonstrates the existence of transport directions with no spin precession in a 2DES with Rashba and Dresselhaus couplings, introducing a potential precessionless spin transport wire.

Findings

Certain directions in 2DES exhibit no spin precession.

Adjacent regions along these directions maintain nearly conserved spin.

Potential application in semiconductor spintronics as a precessionless transport wire.

Abstract

We demonstrate that in an inversion-asymmetric two-dimensional electron system 2DES with both Rashba and Dresselhaus spin-orbit couplings taken into account, certain transport directions on which no spin precession occurs can be found when the injected spin is properly polarized. By analyzing the expectation value of spin with respect to the injected electron state on each space point in the 2DES, we further show that the adjacent regions with technically reachable widths along these directions exhibit nearly conserved spin. Hence a possible application in semiconductor spintronics, namely, precessionless spin transport wire, is proposed.