Spin phenomena of CdZnSe self-assembled quantum dots investigated by magneto-photoluminescence

Yungjun Kim, Sanghoon Lee, M. Dobrowolska, J. K. Furdyna

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Magneto-photoluminescence (PL) experiments were carried out on a self-assembled CdZnSe/ZnSe quantum dot (QD) system. The intensities of the PL peak exhibited significant differences for the two circular polarizations when a magnetic field was applied. A simple two-level rate equation model, including the spin flip time r, and the exciton recombination time rr , was used to analyze the observed degree of the polarization in the polarization selective PL measurements. Specifically, the magnetic field dependence of the polarization was fitted by treating T,/TT as a fitting parameter in the model. The best fitting was obtained with the value of ra/rr ~ a, indicating that the spin relaxation time is much longer than the exciton recombination time. Such polarization selective PL measurements were further performed at several different temperatures, which showed a systematic decrease in the degree of polarization with increasing temperature.

    Original languageEnglish
    Pages (from-to)76-79
    Number of pages4
    JournalJournal of the Korean Physical Society
    Volume55
    Issue number1
    DOIs
    Publication statusPublished - 2009 Jul

    Keywords

    • Polarization
    • Self-assembled quantum dot
    • Spin relaxation

    ASJC Scopus subject areas

    • General Physics and Astronomy

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