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We used continuous wave photoluminescence (cw-PL) and time resolvedphotoluminescence (TR-PL) spectroscopy to compare the properties of magneticpolarons (MP) in two related spatially indirect II-VI epitaxially grown quantumdot systems. In the ZnTe/(Zn,Mn)Se system the holes are confined in thenon-magnetic ZnTe quantum dots (QDs), and the electrons reside in the magnetic(Zn,Mn)Se matrix. On the other hand, in the (Zn,Mn)Te/ZnSe system, the holesare confined in the magnetic (Zn,Mn)Te QDs, while the electrons remain in thesurrounding non-magnetic ZnSe matrix. The magnetic polaron formation energiesin both systems were measured from the temporal red-shift of the band-edgeemission. The magnetic polaron exhibits distinct characteristics depending onthe location of the Mn ions. In the ZnTe/(Zn,Mn)Se system the magnetic polaronshows conventional behavior with decreasing with increasing temperature T andincreasing magnetic field B. In contrast, in the (Zn,Mn)Te/ZnSe system hasunconventional dependence on temperature T and magnetic field B; is weaklydependent on T as well as on B. We discuss a possible origin for such astriking difference in the MP properties in two closely related QD systems.

Time-resolved magnetophotoluminescence studies of magnetic polaron dynamics in type-II quantum dots