Dynamic Nuclear Overhauser Shifts in Larmor beats from a quantum well

TL;DR

This paper investigates how nuclear spin polarization affects electron spin dynamics in a quantum well, revealing measurable Overhauser shifts that enhance understanding of spin interactions for spintronic applications.

Contribution

It demonstrates the observation of significant Overhauser shifts in Larmor beats, providing new insights into nuclear spin effects in quantum wells.

Findings

Overhauser shift of 0.7 T observed

Nuclear polarization ratio <I>/I=0.065 determined

Implications for electron g-factor and spin transport discussed

Abstract

The significance of nuclear spin polarisation in time-resolved optical studies of III-V semiconductors is addressed. Electron Larmor beats in pump-probe reflectivity from a GaAs/AlGaAs quantum well show Overhauser shift of 0.7 T due to accumulated nuclear polarisation <I>/I=0.065. This leads to precision values of electron g-factor, elucidates nuclear spin pumping and diffusion mechanisms in quantum wells and informs discussion of implications for spin-electronics and transport.