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Fine structure of emission lines from charged CdSe/ZnSe/ZnMnSe quantum dots
Author(s) -
Chekhovich E. A.,
Brichkin A. S.,
Kulakovskii V. D.,
Ivanov S. V.,
Toropov A. A.,
Glazov M. M.
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.200983182
Subject(s) - trion , quantum dot , biexciton , exciton , photoluminescence , luminescence , polaron , spectroscopy , physics , atomic physics , magnetic field , emission spectrum , charge (physics) , ground state , condensed matter physics , molecular physics , spectral line , electron , optoelectronics , quantum mechanics
Photoluminescence spectroscopy has been employed to study CdSe/ZnSe/ZnMnSe quantum dots. For most of the dots studied here luminescence comes in three spectrally separated features: neutral exciton ( X ), biexciton ( XX ), and charged exciton ( X C ) states. Spectral properties of X and XX emission are well understood, however, in a marked contrast with previous studies, the observed fine structure of X C can not be explained within a commonly accepted model of a ground state trion luminescence. We find that at zero magnetic field luminescence from the charged state exhibits fine structure that varies gradually between different dots from a single unpolarized line to a quartet with the maximum splitting of 2 meV. Several models including magnetic polaron formation and double charging have been considered, but a plausible explanation can be given only if one considers the influence of a charge trapped in a nearby dot.
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