Anisotropic carrier transport induced by high-field terahertz pulses in $n-$doped InGaAs

ORAL

Abstract

We use ultrafast THz-pump/THz-probe techniques to study hot electron dynamics at high THz pump fields in $n-$doped InGaAs films. The transmission of the THz probe pulse increases at high THz pump fields for probe polarizations both parallel and perpendicular to the pump field. However, a significantly larger ultrafast modulation in the transmission of the THz probe pulse is observed in the parallel polarization case. We attribute this anisotropic behavior in THz probe pulse transmission to nonparabolicity in the conduction band that results in an anisotropic effective mass for carriers excited high in the band by the THz pump field.

*Supported by NSERC, FQRNT, and INRS.

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Authors

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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