Time-resolved measurements on self-assembled CdSe/ZnMnSe quantum dots are presented. A rather long excitonic decay time of 580 ps is found which indicates a suppression of nonradiative recombination via the internal Mn²⁺ transition. The long excitonic lifetime allows for the formation of magnetic polarons, as evidenced by a transient redshift of the luminescence emission with a time constant of 125 ps. In a magnetic field, a decrease of the measured excitonic decay time is observed and a possible mechanism based on an interplay between bright and dark excitons is discussed.

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Volume229, Issue2

January 2002

Pages 727-731

Dynamics of Zero-Dimensional Excitons in a Semimagnetic Environment

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Dynamics of Zero-Dimensional Excitons in a Semimagnetic Environment

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