Stimulated Raman spin coherence and spin-flip induced hole burning in charged GaAs quantum dots

TL;DR

This paper investigates spin coherence and spin-flip effects in charged GaAs quantum dots using spectral hole burning, revealing detailed electron spin dynamics and spectral diffusion processes through high-resolution spectroscopy.

Contribution

It demonstrates the use of spectral hole burning to observe stimulated Raman spin coherence and spin population dynamics in charged quantum dots, providing new insights into spin-related processes.

Findings

Observation of Stokes and anti-Stokes sidebands indicating stimulated Raman coherence

Detection of a narrow spike at zero detuning from spin population pulsation

Linewidth analysis revealing spin spectral diffusion processes

Abstract

High-resolution spectral hole burning (SHB) in coherent nondegenerate differential transmission spectroscopy discloses spin-trion dynamics in an ensemble of negatively charged quantum dots. In the Voigt geometry, stimulated Raman spin coherence gives rise to Stokes and anti-Stokes sidebands on top of the trion spectral hole. The prominent feature of an extremely narrow spike at zero detuning arises from spin population pulsation dynamics. These SHB features confirm coherent electron spin dynamics in charged dots, and the linewidths reveal spin spectral diffusion processes.