High-field magneto-excitons in unstrained GaAs/AlGaAs quantum dots

TL;DR

This paper investigates how magnetic fields affect excitonic states in unstrained GaAs/AlGaAs quantum dots through combined theoretical modeling and experimental measurements, revealing detailed magnetic responses up to 50 Tesla.

Contribution

It provides a comprehensive analysis of magneto-excitons in unstrained GaAs/AlGaAs quantum dots using advanced theoretical models validated by experiments.

Findings

Good agreement between theory and experiment.

Magnetic field influences excitonic energy levels.

Diamagnetic shifts observed up to 50 Tesla.

Abstract

The magnetic field dependence of the excitonic states in unstrained GaAs/AlGaAs quantum dots is investigated theoretically and experimentally. The diamagnetic shift for the ground and the excited states are studied in magnetic fields of varying orientation. In the theoretical study, calculations are performed within the single band effective mass approximation, including band nonparabolicity, the full experimental three-dimensional dot shape and the electron-hole Coulomb interaction. These calculations are compared with the experimental results for both the ground and the excited states in fields up to 50 Tesla. Good agreement is found between theory and experiment.