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Mn 2+ ‐assisted recombination of trions in semimagnetic quantum dots
Author(s) -
Chernenko A. V.,
Brichkin A. S.,
Sokolov S. V.,
Ivanov S. V.
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200983235
Subject(s) - trion , exciton , physics , spin (aerodynamics) , quantum dot , photoluminescence , atomic physics , recombination , magnetic field , coulomb , condensed matter physics , spectral line , radiative transfer , spontaneous emission , chemistry , electron , optics , quantum mechanics , laser , biochemistry , gene , thermodynamics
Photoluminescence studies of individual CdSe/ZnSe/ZnMnSe quantum dots (QDs) allow us to observe excitons and negatively charged trions in spectra recorded at liquid He temperatures. Exciton and trion lines equally split into a doublet of circularly polarized lines in a magnetic field B directed perpendicular to the sample plain. The ratio of intensities of lines in the doublet differs for excitons and trions. The difference can be explained if spin‐dependent non‐radiative recombination is taken into account. Contrary to expectations processes induced by the Coulomb interaction do not lead to such a recombination. The dominant mechanism of spin‐dependent energy transfer from photoexcited QDs to Mn ions is related to the sp‐d mixing. The efficiency of this mechanism substantially exceeds that induced by the Coulomb interaction. Suppression of the non‐radiative recombination by a magnetic field in Faraday geometry leads to the increase in QDs PL intensity.