Abstract
We have performed magnetoluminescence and magnetoreflectance studies on novel semimagnetic semiconductor heterostructures based on /. The successful fabrication and various optical properties of that system are demonstrated by /” ” single quantum wells. The exciton spin splitting was used to determine the valence-band offset for / to of the total band-gap discontinuity. Weakly confining multiple quantum wells made of demonstrate a change of the band alignment from type I to type II for one of the exciton spin components in external magnetic fields which results in the formation of a spin superlattice. This spin superlattice formation manifests itself in an asymmetric Zeeman splitting of a spatially direct exciton caused by a spin-dependent change of the exciton binding energy. A pronounced broadening of the exciton in reflectance and photoluminescence excitation spectra was observed when scattering into the (ZnBe)Se barriers becomes possible.
- Received 22 February 1999
DOI:https://doi.org/10.1103/PhysRevB.60.2653
©1999 American Physical Society