Magnetic-Field-Induced Level Crossing and the Spin Dynamics of Excitons in Zn1−x Mn x Te/ZnTe Quantum Wells |
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Authors: | S. Shirotori K. Kayanuma T. Tomita Z. H. Chen M. C. Debnath I. Souma A. Murayama Y. Oka |
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Affiliation: | 1. IMRAM, Tohoku University, Aoba-ku, Sendai, 980-8577, Japan
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Abstract: | Magnetic-field-induced level crossing and the spin dynamics of excitons in a Zn1?x Mn x Te/ZnTe single quantum well are studied. The circularly-polarized photoluminescence (PL) shows that the down spin branch of the Zn1?x Mn x Te exciton overlaps with both the up and down spin branches of the ZnTe exciton at a crossing field (H c) of 4 T, due to the giant Zeeman shift of Zn1?x Mn x Te. The PL intensities and lifetimes in each layer become gradually equal toward H c, which shows the mixing of wavefunctions of the excitons generated in each layer. Above H c, each branch of the spin-polarized exciton separates again. The lifetimes of the spin-polarized exciton PL reflect the spin-flip relaxation in ZnTe and the spin mixing between Zn1?x Mn x Te and ZnTe layers. |
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