  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.
