Spin dynamics in rolled-up two dimensional electron gases

TL;DR

This paper explores how curvature and spin-orbit interactions in rolled-up 2D electron gases lead to conserved spin components, enabling potential applications in spintronic transistors.

Contribution

It introduces a novel mechanism where curvature and spin-orbit coupling produce conserved spin components in curved 2D electron gases.

Findings

Conservation of tangential spin component at specific coupling-curvature relations

Persistent spin helix formation due to curvature effects

Strong anisotropy in spin relaxation times

Abstract

A curved two dimensional electron gas with spin-orbit interactions due to the radial confinement asymmetry is considered. At certain relation between the spin-orbit coupling strength and curvature radius the tangential component of the electron spin becomes a conserved quantity for any spin-independent scattering potential that leads to a number of interesting effects such as persistent spin helix and strong anisotropy of spin relaxation times. The effect proposed can be utilized in the non-ballistic spin-field-effect transistors.