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We study the role of impurity scattering on the photoluminescence (PL)emission of polarized magnetoexcitons. We consider systems where both theelectron and hole are confined on a ring structure (quantum rings) as well ason a type-II quantum dot. Despite their neutral character, excitons exhibitstrong modulation of energy and oscillator strength in the presence of magneticfields. Scattering impurities enhance the PL intensity on otherwise "dark"magnetic field windows and non-zero PL emission appears for a wide magneticfield range even at zero temperature. For higher temperatures, impurity-inducedanticrossings on the excitonic spectrum lead to unexpected peaks and valleys onthe PL intensity as function of magnetic field. Such behavior is absent onideal systems and can account for prominent features in recent experimentalresults.Comment: 7 pages, 7 figures, RevTe

Impurity effects on the Aharonov-Bohm optical signatures of neutral quantum-ring magnetoexcitons