Optical Spectroscopy of the Hole Spin in GaMnAs Acceptors

TL;DR

This study uses optical spectroscopy to analyze the spin state of holes bound to Mn acceptors in GaMnAs, revealing polarization behaviors influenced by magnetic field and temperature, and providing insights into the spin dynamics of acceptor complexes.

Contribution

It provides new experimental insights into the optical properties and spin polarization of holes bound to Mn acceptors in GaMnAs, with detailed spectral and polarization analysis.

Findings

Circular polarization saturates at ~1/3 with magnetic field.

Multiple spectral peaks observed in photoluminescence.

Polarization behavior aligns with theoretical modeling.

Abstract

The spin state of holes bound to Mn acceptors in GaMnAs is investigated by optical spectroscopy. Concentrations of Mn from 10^17 to 10^19 cm^-3 were studied as a function of magnetic field and temperature. The photoluminescence from recombination of electrons with holes bound in the Mn-acceptor complex (MAC) displays multiple spectral peaks. The circular polarization rho of these peaks increases with increasing magnetic field and saturates at rho ~= 1/3. This value of polarization is expected from modeling the addition of spin angular momentum and interband optical transition matrix elements.