DYNAMICS OF EXCITON MAGNETIC POLARONS IN CD1-XMNXTE CD1-X-YMNXMGYTE QUANTUM-WELLS/

We study the influence of quantum confinement and spin-lattice relaxat ion on the dynamics of exciton magnetic polaron formation in specially designed semimagnetic quantum wells. Using low temperature time-resol ved photoluminescence with variable pulse separation we show that a de crease of the well width does not only enhance the polaron energy but also shortens its formation time. Comparison with numerical calculatio ns reveal that the latter can be associated with smaller changes of th e excitonic wave function during polaron formation. In addition, by me asuring the polaron formation time as a function of pulse separation w e show that spin-lattice coupling influences the polaron dynamics indi rectly rather than directly by transferring the polaron induced energy gain of the spin-system to the lattice.