FEMTOSECOND SCATTERING DYNAMICS IN MAGNETIC SEMICONDUCTOR SPIN SUPERLATTICES

Spin-dependent dynamics of polarized carriers in a series of Zn1-xMnxS e/ZnSe superlattice structures are directly observed by time-resolved upconversion photoluminescence spectroscopy at low temperatures. Polar ization measurements in small magnetic fields reveal spin-flip scatter ing of carriers confined within a magnetic quantum well. A marked chan ge in the dynamics is observed with increasing field and subsequent sp in superlattice formation. Exciton lifetimes and spin relaxation are s een to be strongly dependent on both the energy and location of spin s tates in the heterostructure.