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Dynamical spin separation induced by spin-dependent type-II band alignment in a diluted magnetic double quantum well

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5 Author(s)
Koyama, T. ; Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan ; Kayanuma, K. ; Souma, I. ; Murayama, A.
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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 500 ps from the NMW to the MW.

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Applied Physics Letters  (Volume:88 ,  Issue: 21 )