Comment on "Density dependence of electron-spin polarization and relaxation in intrinsic GaAs at room temperature"

TL;DR

This paper critiques a previous conclusion by arguing that the D'yakonov-Perel' mechanism, not the Bir-Aronov-Pikus mechanism, dominates spin relaxation in intrinsic GaAs at high carrier densities.

Contribution

It clarifies the dominant spin relaxation mechanism in intrinsic GaAs, challenging prior claims and emphasizing the role of the D'yakonov-Perel' mechanism.

Findings

Spin relaxation is primarily due to the D'yakonov-Perel' mechanism.

The Bir-Aronov-Pikus mechanism is less significant at high carrier densities.

The critique refines understanding of spin dynamics in GaAs.

Abstract

We comment on the conclusion by Teng et al. [J. Phys. D: Appl. Phys. {\bf 42}, 135111 (2009)] that the Bir-Aronov-Pikus mechanism is more important than the D'yakonov-Perel' mechanism at high carrier density in intrinsic bulk GaAs. We point out that the spin relaxation is solely from the D'yakonov-Perel' mechanism.