Effect of built-in electric field in stacked type-II ZnTe/ZnSe submonolayer quantum dots: enhancement and narrowing of Aharonov-Bohm oscillations

ORAL

Abstract

Robust and narrow Aharonov-Bohm (AB) oscillations were observed in both intensity and energy of the mangeto-photoluminescence (PL) from stacked type-II ZnTe/ZnSe submonolayer quantum dots (QDs) grown via migration enhanced epitaxy. The narrowness and enhancement in the AB oscillations is a consequence of the built-in electric field in the system. Spectral analysis of cw magneto-PL and time-resolved PL suggest that the QD stacks size distribution is not large and thus broadening of the PL is possibly due to strong electron-phonon interaction as generally seen in bulk Zn-Se-Te systems.

*This work is supported by NSF grant DNR \# 1006050.

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Authors

  • Bidisha Roy

    • Queens College of CUNY

  • Siddharth Dhomkar

    • Department of Physics, Queens College and the Graduate Center, CUNY, NY 10016
    • Queens College of CUNY

  • Haojie Ji

    • Queens College of CUNY

  • Maria Tamargo

    • The Graduate Center, CUNY, NY 10016
    • The City College of New York, NY, NY 10031
    • The City College of New York of CUNY

  • Igor Kuskovsky

    • Queens College of CUNY