Abstract
Dynamical spin separation is demonstrated in a magnetic double quantum well composed of a diluted magnetic semiconductor well (MW) and a nonmagnetic well (NMW). Excitonic photoluminescence of the type-II transition between an electron in the NMW and a down-spin heavy hole (hh) in the MW is induced with an increase in the magnetic field. A type-I transition involving an up-spin hh inside the NMW is simultaneously observed. Therefore, the hh spins are concluded to be spatially separated, which is sustained by a low hh-spin injection time of 500ps from the NMW to the MW.
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