Terahertz-pulse-induced hot-electron transport in photoexcited GaAs

ORAL

Abstract

We observe self-induced absorption bleaching of intense terahertz (THz) pulses in photoexcited GaAs using optical-pump/THz-probe techniques. The sample is excited using 800nm, 50fs laser pulses and probed collinearly using few-cycle THz pulses with energies up to 0.6$\mu $J. The relative transmission of the THz probe pulse through the photoexcited GaAs increase at high probe fields. A simple dynamic electron transport model demonstrates that the nonlinear response arises from a decrease in electron conductivity due to intervalley electron scattering induced by the THz electric field over sub-picosecond time scales as well as an increase in the intravalley scattering rate.

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Authors

  • Fuhai Su

    • Department of Physics, University of Alberta
    • Department of Physics, University of Alberta, Edmonton, Alberta, Canada
    • Department of Physics, University of Alberta, AB, Canada

  • Francois Blanchard

    • INRS-EMT, Advanced Laser Light Source, Universit\'e du Qu\'ebec, Varennes, Qu\'ebec, Canada
    • INRS-EMT, Advanced Laser Light Source,Universit\'e du Qu\'ebec, QC, Canada

  • Gargi Sharma

    • INRS-EMT, Advanced Laser Light Source, Universit\'e du Qu\'ebec, Varennes, Qu\'ebec, Canada
    • INRS-EMT, Advanced Laser Light Source,Universit\'e du Qu\'ebec, QC, Canada

  • Luca Razzari

    • INRS-EMT, Advanced Laser Light Source, Universit\'e du Qu\'ebec, Varennes, Qu\'ebec, Canada
    • INRS-EMT, Advanced Laser Light Source,Universit\'e du Qu\'ebec, QC, Canada

  • Ayesheshim Ayesheshim

    • Department of Physics, University of Alberta, Edmonton, AB, T6G 2G7, Canada
    • Department of Physics, University of Alberta, AB, Canada

  • T.L. Cocker

    • Department of Physics, University of Alberta, Edmonton, Alberta T6G2G7 Canada
    • Department of Physics, University of Alberta, Edmonton, Alberta T6G 2G7, Canada
    • Department of Physics, University of Alberta, AB, Canada

  • L.V. Titova

    • Department of Physics, University of Alberta, Edmonton, Alberta T6G2G7 Canada
    • Department of Physics, University of Alberta, Edmonton, Alberta T6G 2G7, Canada
    • Department of Physics, University of Alberta, AB, Canada

  • Tsuneyuki Ozaki

    • INRS-EMT, Advanced Laser Light Source, Universit\'e du Qu\'ebec, Varennes, Qu\'ebec, Canada
    • INRS-EMT, Advanced Laser Light Source,Universit\'e du Qu\'ebec, QC, Canada

  • Jean-Claude Kieffer

    • INRS-EMT, Advanced Laser Light Source,Universit\'e du Qu\'ebec, QC, Canada

  • Roberto Morandotti

    • INRS-EMT, Advanced Laser Light Source, Universit\'e du Qu\'ebec, Varennes, Qu\'ebec, Canada
    • INRS-EMT, Advanced Laser Light Source,Universit\'e du Qu\'ebec, QC, Canada

  • Matthew Reid

    • Department of Physics, University of Northern British Columbia, Prince George, British Columbia, Canada
    • Department of Physics, University of Northern British Columbia, BC, Canada

  • F.A. Hegmann

    • Department of Physics, University of Alberta, Edmonton, AB, T6G 2G7, Canada
    • Department of Physics, University of Alberta, Edmonton, Alberta T6G2G7 Canada
    • Department of Physics, University of Alberta, Edmonton, Alberta T6G 2G7, Canada
    • Department of Physics, University of Alberta, Edmonton, Alberta, Canada
    • Department of Physics, University of Alberta, AB, Canada