Spin dynamics in p-doped semiconductor nanostructures subject to a magnetic field tilted from the Voigt geometry

TL;DR

This paper presents a theoretical model for hole spin dynamics in p-doped semiconductor quantum wells under tilted magnetic fields, validated by experiments, revealing conditions for RSA peak inversion and detailed spin behavior.

Contribution

It introduces a comprehensive theoretical framework for spin dynamics under tilted magnetic fields and confirms its accuracy through experimental validation.

Findings

RSA peak inversion occurs for long hole spin dephasing times and tilted fields

The model accurately reproduces experimental TRFR and RSA signals

Spin dynamics depend critically on magnetic field tilt and system parameters

Abstract

We develop a theoretical description of the spin dynamics of resident holes in a p-doped semiconductor quantum well (QW) subject to a magnetic field tilted from the Voigt geometry. We find the expressions for the signals measured in time-resolved Faraday rotation (TRFR) and resonant spin amplification (RSA) experiments and study their behavior for a range of system parameters. We find that an inversion of the RSA peaks can occur for long hole spin dephasing times and tilted magnetic fields. We verify the validity of our theoretical findings by performing a series of TRFR and RSA experiments on a p-modulation doped GaAs/Al_{0.3}Ga_{0.7}As single QW and showing that our model can reproduce experimentally observed signals.