Abstract
We have investigated the photoluminescence (PL) spectra of GaP/AlP short-period superlattices and a neighboring confinement structure with type-II alignment in high magnetic fields. When the field is applied perpendicular to the hetero-interfaces at 4.2K, the PL intensity decreases and the PL peak energy shows red-shifts with increasing magnetic field except for comparatively long-period SL. Such features are quite distinct from that of type-I excitons. Additionally, these anomalies are found to be temperature dependent, PL peak energy shows a blue-shift in high magnetic fields at 20K. The strong PL is described in terms of the exciton localization caused by interface fluctuation, and the observed anomalies of the magneto-PL are attributed to the dynamical change of the exciton recombination process due to the carrier localization in a magnetic field.
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