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
2008 (English)Conference paper (Refereed)
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.
, MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, ISSN 0921-5107 ; 47
CdSe, DMS, Magneto-optical, Quantum dots, Spin dynamics, Spin-injection, ZnCdMnSe
Engineering and Technology Condensed Matter Physics
IdentifiersURN: urn:nbn:se:liu:diva-46844DOI: 10.1016/j.mseb.2007.08.018OAI: oai:DiVA.org:liu-46844DiVA: diva2:267740
E-MRS 2007, Symposium B: Semiconductor Nanostructures towards Electronic and Optoelectronic Device Applications