Competition between applied and exchange magnetic fields in (Zn,Mn)Se/ZnTe quantum dots

ORAL

Abstract

We have measured the peak energy of the photoluminescence (PL) emission and its circular polarization from type II (Zn,Mn)Se/ZnTe Quantum Dot structures in the Faraday and Voigt geometries. In the Faraday geometry the PL energy shows a 6 meV red shift at B$=$6 tesla. This result verifies that the holes are confined in the non-magnetic ZnTe QDs, while the electrons move in the magnetic (Zn,Mn)Se matrix. The PL circular polarization saturates at 45{\%}. In the Voigt geometry, the circular polarization is near-zero and the red shift is 2 meV. These results are discussed using a model that takes into account that electrons are influenced by the combination of the externally applied magnetic field and the exchange field due to the interaction between the Mn-spins and the carriers.

*This work is supported by DOE-BES and NSF-DMR

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Authors

  • Biplob Barman

    • SUNY Buffalo
    • SUNY at Buffalo

  • Yutsung Tsai

    • SUNY Buffalo
    • SUNY at Buffalo
    • Physics Department, The State University of New York at Buffalo

  • Thomas Scrace

    • SUNY Buffalo
    • SUNY at Buffalo
    • Physics Department, The State University of New York at Buffalo

  • I. Zutic

    • SUNY Buffalo

  • B.D. McCombe

    • SUNY Buffalo

  • Athos Petrou

    • SUNY Buffalo
    • SUNY at Buffalo
    • Physics Department, The State University of New York at Buffalo

  • W-C Chou

    • National Chiao Tung University, Taiwan

  • M-H Tsou

    • National Chiao Tung University, Taiwan

  • C-S Yang

    • Graduate Institute of Electro-Optical Engineering, Tatung University, Taiwan

  • Ian Sellers

    • University of Oklahoma

  • Rafal Oszwaldowski

    • South Dakota School of Mines and Technology
    • SDSMT Physics