Aharonov-Bohm magneto-optical spectroscopy and photoluminescence of spinor excitons in semiconductor nano rings

We investigate the Aharonov-Bohm (AB) magneto-optical (MO) spectroscopy and the photoluminescence (PL) of excitons in semiconductor nano rings in the presence of Rashba and Dresselhaus spin-orbit interactions (SOI). With SOI, a blue shift is found for bright exciton region, in which PL intensity is rather depressed in subtle intervals due to spin conservation. The detection of AB effect represents a coherent circulation of excitons which may sustain dipole induced persistent charge and spin currents in the presence of SOIs. The system provides a prototype of a quantum switch and a current generator via coherent control of excitons in dark and bright regions.