Direction Dependence of Spin Relaxation in Confined 2D Systems

TL;DR

This paper investigates how the direction of quantum wires influences spin relaxation in 2D systems with Rashba and Dresselhaus spin-orbit coupling, revealing directional dependencies and effects of wire dimensions on relaxation rates.

Contribution

It provides a detailed analysis of spin relaxation dependence on wire orientation and size in systems with complex spin-orbit interactions, including non-diffusive regimes.

Findings

Spin relaxation varies with wire direction in 2D systems.

Cubic Dresselhaus coupling effects are reduced in non-diffusive wires.

Linear spin relaxation shifts with the number of transverse channels.

Abstract

The dependence of spin relaxation on the direction of the quantum wire under Rashba and Dresselhaus (linear and cubic) spin orbit coupling is studied. Comprising the dimensional reduction of the wire in the diffusive regime, the lowest spin relaxation and dephasing rates for (001) and (110) systems are found. The analysis of spin relaxation reduction is then extended to non-diffusive wires where it is shown that, in contrast to the theory of dimensional crossover from weak localization to weak antilocalization in diffusive wires, the relaxation due to cubic Dresselhaus spin orbit coupling is reduced and the linear part shifted with the number of transverse channels.