# Electron-nuclear coherent spin oscillations probed by spin dependent recombination

## TL;DR

This paper demonstrates a method to detect and measure coherent electron-nuclear spin oscillations in GaAsN using a pump-probe photoluminescence technique, revealing hyperfine interactions without external magnetic fields.

## Contribution

It introduces a novel optical approach to directly measure hyperfine constants and nuclear isotope contributions in semiconductors without electron spin resonance or magnetic fields.

## Key findings

- Hyperfine constants of electrons in GaAsN were measured.
- Nuclear isotope contributions were identified.
- Spin relaxation parameters were estimated from oscillation damping.

## Abstract

We demonstrate the detection of coherent electron-nuclear spin oscillations related to the hyperfine interaction and revealed by the band-to-band photoluminescence (PL) in zero external magnetic field. On the base of a pump-probe PL experiment we measure, directly in the temporal domain, the hyperfine constant of an electron coupled to a gallium defect in GaAsN by tracing the dynamical behavior of the conduction electron spin-dependent recombination to the defect site. The hyperfine constants and the relative abundance of the nuclei isotopes involved can be determined without the need of electron spin resonance technique and in the absence of any magnetic field. Information on the nuclear and electron spin relaxation damping parameters can also be estimated from the oscillations damping and the long delay behavior.