CdSe/Zn1-xMnxTe superlattices are characterized by type-II band alignment. We have used these structures to demonstrate that type-II superlattices can exhibit type-I excitons, i.e., excitons which are confined in the same semiconductor layer (either in CdSe or in Zn1-xMnxTe in the present example). Such spatially direct excitons form in a type-II structure when one of the carriers (electron or hole) originates from a well, while the other (hole or electron) originates from a state localized in the barrier, which is typical for subbands at above-barrier energies.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics