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Density-dependent dynamics of exciton magnetic polarons in ZnMnSe/ZnSSe type-II quantum wells
Ioffe Physico-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia.
Ioffe Physico-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia.
Ioffe Physico-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia.
Ioffe Physico-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia.
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2006 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 73, no 24, 245335- p.Article in journal (Refereed) Published
Abstract [en]

We report on time-resolved photoluminescence studies of exciton dynamics in a ZnMnSe/ZnSSe type-II quantum well. Strong separation of the electrons, confined to the nonmagnetic semiconductor ZnSSe, and holes, confined to the diluted magnetic semiconductor ZnMnSe, results in an exciton lifetime exceeding 3 ns. Two excitonic emission lines are observed in this structure at low temperatures. The lower-energy line was associated with the formation of an exciton magnetic polaron (EMP), whereas the higher-energy line was attributed to the emission of nonmagnetically localized excitons. The intensity of the EMP line was found to saturate at a relatively low density of photoexcited carriers well below the exciton Mott density. This behavior evidences a limited density of sites where the hole localization radius is small enough to ensure the fast formation of EMP's with a noticeable binding energy. © 2006 The American Physical Society.

Place, publisher, year, edition, pages
APS , 2006. Vol. 73, no 24, 245335- p.
National Category
Natural Sciences Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-36503DOI: 10.1103/PhysRevB.73.245335Local ID: 31460OAI: oai:DiVA.org:liu-36503DiVA: diva2:257351
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2017-12-13

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Bergman, PederBuyanova, IrinaChen, WeiminMonemar, Bo

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