Spin-dephasing anisotropy for electrons in a diffusive quasi-1D GaAs wire

TL;DR

This study numerically investigates how wire width, orientation, and spin-orbit interactions influence electron spin dephasing in a diffusive quasi-1D GaAs wire, revealing conditions for strong suppression of dephasing.

Contribution

It demonstrates the suppression of spin dephasing under specific conditions and analyzes how this effect varies with material parameters and wire orientation.

Findings

Strong suppression of spin-dephasing occurs below the spin precession length.

Wire orientation significantly affects the dephasing suppression.

Degradation of the effect is observed with increased Rashba and Dresselhaus field imbalance.

Abstract

We present a numerical study of dephasing of electron spin ensembles in a diffusive quasi-one-dimensional GaAs wire due to the D'yakonov-Perel' spin-dephasing mechanism. For widths of the wire below the spin precession length and for equal strength of Rashba and linear Dresselhaus spin-orbit fields a strong suppression of spin-dephasing is found. This suppression of spin-dephasing shows a strong dependence on the wire orientation with respect to the crystal lattice. The relevance for realistic cases is evaluated by studying how this effect degrades for deviating strength of Rashba and linear Dresselhaus fields, and with the inclusion of the cubic Dresselhaus term.