Abstract
AbstractPhotoluminescence 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.
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