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