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Excitonic spin states and radiative recombinations in Cd1−xMnxTe/Cd1−yMgyTe spin superlattices

✍ Scribed by M.C. Debnath; J.X. Shen; I. Souma; T. Sato; R. Pittini; Z.H. Chen; Y. Oka

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
150 KB
Volume
10
Category
Article
ISSN
1386-9477

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✦ Synopsis

The formation of a spin superlattice structure was realized in Cd0:95Mn0:05Te=Cd0:95Mg 0:05 Te under a magnetic ÿeld. The experimental evidence of the spin superlattice structure was found from time-resolved polarized magneto-photoluminescence measurements, in the Zeeman splittings and the exciton magnetic polaron formation. The Zeeman splitting directly indicates the spatial separation of spin-up and spin-down electrons and heavy holes, which are localized in the Cd0:95Mg 0:05 Te and Cd0:95Mn0:05Te layers, respectively. The formation of exciton magnetic polarons under a magnetic ÿeld can be attributed to the spin-dependent conÿnement where a large polaron binding energy of 3.5 meV has been observed in 2.5 T to be enhanced by the ÿeld-induced localization of the excitons.

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Effects of spin polarization on electron
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We examine and identify magnetoresistance mechanisms in 2D system containing a sizable concentration of magnetic ions. We argue that some of these mechanisms can serve as a tool to measure spin polarization. Lack of spin degeneracy and enhanced localization make it possible to detect an additional Q