Non-circular semiconductor nanorings of type I and II: Emission kinetics in the exciton Aharonov-Bohm effect

Abstract

Transition energies and oscillator strengths of excitons in dependence on magnetic field are investigated in type I and II semiconductor nanorings. A slight deviation from circular (concentric) shape of the type II nanoring gives a better observability of the Aharonov-Bohm oscillations since the ground state is always optically active. Kinetic equations for the exciton occupation are solved with acoustic phonon scattering as the major relaxation process, and absorption and luminescence spectra are calculated showing deviations from equilibrium. The presence of a non-radiative exciton decay leads to a quenching of the integrated photoluminescence with magnetic field.

arXiv commentThe first version submitted to Phys. Rev. B on April 16, 2007. Revised (this) version on July 31, 2007

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• Optical Aharonov-Bohm Effect on Wigner Molecules in Type-II Semiconductor Quantum Dots
• Microcavity polaritons in disordered exciton lattices
• Decoupling and antiresonance in electronic transport through a quantum dot chain embodied in an Aharonov-Bohm interferometer
• Disorder and Interactions in Graphene and other Quantum Systems
• Magneto-Optical Quantum Switching in a System of Spinor Excitons