Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-09-17
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
The first version submitted to Phys. Rev. B on April 16, 2007. Revised (this) version on July 31, 2007
Scientific paper
10.1103/PhysRevB.76.195326
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.
Grochol Michal
Zimmermann Roland
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