Optical spectroscopy of single beryllium acceptors in GaAs/AlGaAs quantum well

TL;DR

This study combines microphotoluminescence experiments and a theoretical model to analyze the fine structure of single beryllium acceptors in GaAs/AlGaAs quantum wells, revealing detailed impurity states.

Contribution

The paper introduces a comprehensive theoretical model that accounts for quantum well confinement and exchange interactions, enabling detailed analysis of individual acceptor states.

Findings

Successful observation of single acceptors in a 2D quantum well environment

Good agreement between experimental data and the theoretical model

Identification of unstrained acceptor states within the quantum well

Abstract

We carry out microphotoluminescence measurements of an acceptor-bound exciton (A^0X) recombination in the applied magnetic field with a single impurity resolution. In order to describe the obtained spectra we develop a theoretical model taking into account a quantum well (QW) confinement, an electron-hole and hole-hole exchange interaction. By means of fitting the measured data with the model we are able to study the fine structure of individual acceptors inside the QW. The good agreement between our experiments and the model indicates that we observe single acceptors in a pure two-dimensional environment whose states are unstrained in the QW plain.