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Magneto-optical and tunable laser excitation spectroscopy of spin-injection and spin loss from Zn(Cd)MnSe diluted magnetic quantum well to CdSe non-magnetic quantum dots
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials.
Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, The Institute of Technology.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
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, 980-8577, Japan.
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2008 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Magneto-optical spectroscopy in combination with tunable laser spectroscopy is employed to study the effect of sample design on optical spin-injection efficiency from a Zn(Cd)MnSe diluted magnetic semiconductor (DMS) into non-magnetic CdSe quantum dots (QDs). Two samples with inverted growth sequence of the DMS and QD layers were grown for this purpose. Despite observation of clear evidence for exciton/carrier-injection from the DMS to the QDs in both structures, their spin-injection efficiency is markedly different. The structure grown with the QD layer topmost exhibits rather efficient spin-injection, while the structure grown with the DMS layer topmost does not show any sign of spin-injection. Even in the former case, the spin-polarization of the injected excitons/carriers is deduced to be about 32%, decreasing from 100% before the injection. The observed spin loss is shown to occur during the spin-injection across the heterointerfaces. © 2007 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2008. Vol. 147, no 2-3, 262-266 p.
Series
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, ISSN 0921-5107 ; 47
Keyword [en]
CdSe, DMS, Magneto-optical, Quantum dots, Spin dynamics, Spin-injection, ZnCdMnSe
National Category
Engineering and Technology Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-46844DOI: 10.1016/j.mseb.2007.08.018OAI: oai:DiVA.org:liu-46844DiVA: diva2:267740
Conference
E-MRS 2007, Symposium B: Semiconductor Nanostructures towards Electronic and Optoelectronic Device Applications
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-03-27

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Dagnelund, DanielBuyanova, Irina A.Chen, Weimin

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