Antiferromagnetic coupling in CdSe/ZnMnSe quantum dot structures
2012 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 101, no 5, 052405-1-052405- p.Article in journal (Refereed) Published
Spin polarization of nonmagnetic CdSe quantum dots (QDs) coupled to adjacent ZnMnSe diluted magnetic semiconductor (DMS) is investigated by CW and time-resolved magneto-optical spectroscopy under tunable laser excitation. Efficient enhancement in the degree of σ− circular polarization of photoluminescence from the CdSe QDs is observed under optical excitation at the σ+-active exciton state of the DMS. The fact that the enhancement persists much longer than the exciton lifetime of the DMS rules out a role of the DMS excitons. A possible explanation is discussed in terms of antiferromagnetic coupling between the excitons in QDs and aligned Mn ions in DMS.
Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2012. Vol. 101, no 5, 052405-1-052405- p.
antiferromagnetic materials, cadmium compounds, excitons, II-VI semiconductors, magnetic epitaxial layers, magnetic multilayers, magneto-optical effects, manganese compounds, photoluminescence, semiconductor epitaxial layers, semiconductor quantum dots, semimagnetic semiconductors, time resolved spectra, wide band gap semiconductors, zinc compounds
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:liu:diva-80727DOI: 10.1063/1.4739852ISI: 000307676600046OAI: oai:DiVA.org:liu-80727DiVA: diva2:547957
funding agencies|Swedish Research Council|621-2007-4568621-2011-42542008-6582|Swedish Foundation for International Cooperation in Research and Higher Education (STINT)||Japan Society for the Promotion of Science||2012-08-292012-08-292014-04-03Bibliographically approved