# Magneto-Optical Quantum Switching in a System of Spinor Excitons

## TL;DR

This paper explores the magneto-optical properties of spinor excitons in quantum rings with spin-orbit interactions, revealing mechanisms for controlling photoluminescence, charge, and spin currents, with potential applications in nano-scale optical switches.

## Contribution

It introduces a detailed analysis of spin-orbit effects on excitonic Aharonov-Bohm spectra and demonstrates how manipulating these interactions can enable quantum-ring spinor exciton-based magneto-optical switching.

## Key findings

- Open channels for bright photoluminescence in scalar excitons.
- Forbidden dipolar exciton recombination leads to dark spectra.
- Manipulation of spin-orbit interactions enables control of spin and charge currents.

## Abstract

In this work we investigate magneto-optical properties of two-dimensional semiconductor quantum-ring excitons with Rashba and Dresselhaus spin-orbit interactions threaded by a magnetic flux perpendicular to the plane of the ring. By calculating the excitonic Aharonov-Bohm spectrum, we study the Coulomb and spin-orbit effects on the Aharonov-Bohm features. From the light-matter interactions of the excitons, we find that for scalar excitons, there are open channels for spontaneous recombination resulting in a bright photoluminescence spectrum, whereas the forbidden recombination of dipolar excitons results in a dark photoluminescence spectrum. We investigate the generation of persistent charge and spin currents. The exploration of spin orientations manifests that by adjusting the strength of the spin-orbit interactions, the exciton can be constructed as a squeezed complex with specific spin polarization. Moreover, a coherently moving dipolar exciton acquires a nontrivial dual Aharonov-Casher phase, creating the possibility to generate persistent dipole currents and spin dipole currents. Our study reveals that a manipulation of the spin-orbit interactions provides a potential application for quantum-ring spinor excitons to be utilized in nano-scaled magneto-optical switches.