Rashba spin splitting in different quantum channels

TL;DR

This paper investigates Rashba spin splitting in quantum channels, showing how higher subbands and Coulomb interactions influence spin precession, with implications for spintronic device design.

Contribution

It provides a detailed analysis of Rashba spin splitting considering higher subbands and Coulomb interactions within a combined model.

Findings

Higher subbands' influence depends on confinement shape

Coulomb interactions enhance spin precession at lower densities

Perturbative approach effectively accounts for subband effects

Abstract

Rashba precession of spins moving along a one-subband quantum channel is calculated. The quantitative influence of unoccupied higher subbands depends on the shape of the transversal confinement and can be accounted for perturbatively. Coulomb interactions are included within the Tomonaga--Luttinger model with spin-orbit coupling incorporated. Increasing interaction strength at decreasing carrier density is found to {\sl enhance} spin precession.