High-field optically detected nuclear magnetic resonance in GaAs

TL;DR

This paper introduces a high-field optically detected nuclear magnetic resonance technique in GaAs that detects nuclear polarization with high sensitivity through time-resolved electron spin measurements, enabling detailed nuclear resonance analysis.

Contribution

The study develops a novel high-field ODNMR method that surpasses conventional low-field limitations by using time-resolved electron spin detection for nuclear polarization measurement.

Findings

Detected Ga-69, Ga-71, and As-75 resonances with quadrupolar splittings.

Achieved sensitivity to 0.02% changes in nuclear polarization.

Resolved nuclear resonances in a (110) GaAs quantum well.

Abstract

A method for high-field optically detected nuclear magnetic resonance (ODNMR) is developed sensitive to 10**8 nuclei. Nuclear spin transitions are induced using a radio frequency coil and detected through Faraday rotation spectroscopy. Unlike conventional ODNMR, which is limited to low fields and relies on the measurement of time-averaged luminescence polarization, this technique monitors nuclear polarization through time-resolved measurements of electron spin dynamics. Measurements in a (110) GaAs quantum well reveal Ga-69, Ga-71, and As-75 resonances and their quadrupolar splittings while resolving changes in nuclear polarization of 0.02%.