Photoluminescence studies of various magnetic phases in (Zn,Mn)Te/ZnSe QDs

ORAL

Abstract

We have carried out a magneto-PL study of a single layer of (Zn,Mn)Te/ZnSe quantum dots. The CW PL from a previously studied 5 layer sample exhibits high circular polarization but very small Zeeman splitting. Time-resolved PL exhibited a temperature independent temporal red shift, associated with the magnetic polaron formation. These data have been interpreted as due to the presence of a antiferromagnetic phase for the Mn ions. In the present study, the CW magneto-PL spectra exhibit high circular polarization, but significantly larger Zeeman splittings. Furthermore the Zeeman splitting depends strongly on temperature and vanishes at 50 K. These results indicate the presence of a different magnetic phase for the Mn ions in the single layer QD sample. Time-resolved PL experiments suggest the formation of magnetic polarons in this sample.

*Work at SUNY is supported by DOE-BES, ONR, AFOSR-DCT, NSF, and CAREER

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Authors

  • Joseph Murphy

    • SUNY at Buffalo, Buffalo, NY

  • Lars Schweidenback

    • SUNY at Buffalo, Buffalo, NY

  • Biplob Barman

    • SUNY at Buffalo, Buffalo, NY

  • Rafal Oszwaldowski

    • SUNY at Buffalo, Buffalo, NY

  • Alexander Cartwright

    • SUNY at Buffalo, Buffalo, NY

  • Bruce McCombe

    • SUNY at Buffalo, Buffalo, NY

  • Athos Petrou

    • SUNY at Buffalo, Buffalo, NY

  • Igor Zutic

    • SUNY at Buffalo, Buffalo, NY

  • Ian Sellers

    • University of Oklahoma, Norman, OK

  • Wen Chung Chou

    • National Chiao Tung University, Hsinchu, Taiwan

  • Wu-Ching Fan

    • National Chiao Tung University, Hsinchu, Taiwan