Antiferromagnetic interaction in coupled CdSe/ZnMnSe quantum dot structures | Zendy

Daniel Dagnelund | Zendy; Qianqian Ren | Zendy; I. A. Buyanova | Zendy; Akihiro Murayama | Zendy; Weimin Chen | Zendy

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Antiferromagnetic interaction in coupled CdSe/ZnMnSe quantum dot structures

Author(s) -

Daniel Dagnelund,

Qianqian Ren,

I. A. Buyanova,

Akihiro Murayama,

Weimin Chen

Publication year - 2012

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4739852

Subject(s) - exciton , quantum dot , photoluminescence , antiferromagnetism , excitation , magnetic semiconductor , biexciton , condensed matter physics , spectroscopy , semiconductor , circular polarization , polarization (electrochemistry) , materials science , optoelectronics , chemistry , molecular physics , physics , magnetic field , quantum mechanics

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.

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||

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