SPIN-DEPENDENT CONFINEMENT EFFECTS IN CD0.9MN0.1TE CD0.9MG0.1TE SPIN SUPERLATTICES/

We have realized a spin superlattice structure based on a Cd0.9Mn0.1Te /Cd0.9Mg0.1Te heterostructure, where the valence and the conduction ba nd align with zero band offset. Due to the large spin-splitting of the conduction- and valence band-edges in the semimagnetic (CdMn)Te layer and the vanishing spin-splitting in the nonmagnetic (CdMg)Te layer a significant spatial separation of spin-up and spin-down carriers is ac hieved with increasing magnetic field strength. The formation of the s pin superlattice is proved by the Zeeman pattern of the excitonic stat es. The Zeeman pattern directly reflects the energy shift of spin-up s tates localized in the nonmagnetic and spin-down states in the semimag netic layers. In addition, the exciton magnetic polaron is used as a s ensitive probe for the small confinement potentials controlled by the externally applied field, demonstrating the exciton localisation in th e spin dependent quantum wells of a spin superlattice.