Accessing orbital angular momentum of quantum-ring excitons via directional semiconductor luminescence

Abstract

A full quantum theory is developed for semiconductor quantum ring photoluminescence. The computations show that the orbital angular momentum (OAM) of individual excitons yields strong angle-dependent emission. The characteristic OAM signatures also survive significant amount of dephasing, suggesting efficient quantum-level coupling between quantum-ring excitons and the OAM of light.

Keywords

• quantum ring
• photoluminescence
• orbital angular momentum of light
• 78.55.Cr
• 42.50.Tx
• 73.21.La