Abstract
We report the study of a mixed-spin multiple-quantum-well system consisting of alternating Se and Se layers, grown by molecular-beam epitaxy. The two spin components of the heavy-hole exciton are each dominated by different exchange interactions as revealed by their temperature and magnetic-field dependence. We find that the energy of the spin-down component (-3/2,-1/2) is well described by exchange interactions of the electrons and holes with ions (Brillouin paramagnet), while the energy of the spin-up component (+3/2,+1/2) is determined by the interactions of carriers with ions (Van Vleck paramagnet). Thus, these tailored heterostructures permit simultaneous study of Brillouin and Van Vleck paramagnetism as well as associated carrier dynamics in a single structure.
- Received 1 July 1993
DOI:https://doi.org/10.1103/PhysRevB.48.18272
©1993 American Physical Society