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Resonant suppression of exciton spin relaxation in Zn0.96Mn0.04Se/CdSe superlattices
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials.ORCID iD: 0000-0001-7155-7103
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials.ORCID iD: 0000-0002-6405-9509
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2003 (English)In: Journal of Applied Physics, ISSN 0021-8979, Vol. 93, no 10, 7352- p.Article in journal (Refereed) Published
Abstract [en]

 Spin relaxation processes in strained Zn0.96Mn0.04Se/CdSe superlattices are studied in detail by using hot photoluminescence combined with tunable excitation spectroscopy. A drastic enhancement in occupation of the upper-lying |+1/2,-3/2> state of the heavy-hole excitons is observed when excitation photon energy is resonantly tuned near an integer number of the LO phonon energy above the |+1/2,-3/2> state. Assuming the Boltzmann distribution between the excitonic states, the spin temperature of the excitons is deduced to be as high as 85 K, well above the lattice temperature of 2 K. The observed behavior provides experimental evidence for a surprisingly strong suppression of spin relaxation from the upper spin-split excitonic branch for small values of wave vector.

Place, publisher, year, edition, pages
2003. Vol. 93, no 10, 7352- p.
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Natural Sciences
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URN: urn:nbn:se:liu:diva-45050DOI: 10.1063/1.1556933Local ID: 79494OAI: oai:DiVA.org:liu-45050DiVA: diva2:265912
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2017-03-27

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Buyanova, IrinaChen, Weimin

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