Abstract
We study spin-dependent type-II band alignment and the carrier spin dynamics in a diluted magnetic double quantum well (DQW) composed of a magnetic well (MW) of Zn0.70Cd0.22Mn0.08Se and a Zn0.76Cd0.24Se non-magnetic well (NMW). In this DQW structure, a heavy-hole (hh) level in the MW intersects that in the NMW by applying a magnetic field of 1 T, resulting from the giant Zeeman effect of the hh in the MW. This hh-level crossing induces a type-II band alignment for the spin-polarized hh in the MW and an electron in the NMW. The circularly polarized photoluminescence (PL) energy decreases and the PL lifetime increases simultaneously with an increase in the magnetic field, which is quantitatively explained by the formation of spin-polarized indirect exciton. The magnetic-field dependence of the exciton PL shows the hh-spin dynamics in the transformation from the direct exciton state to indirect one. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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