The Terahertz Frequency Hall Conductivity of a High-Mobility Two-Dimensional Electron Gas

ORAL

Abstract

We have performed the first measurement of the \emph{terahertz-frequency} complex conductivity tensor of a Landau-quantized high mobility ($10^{6}$ cm$^{2}$ V$^{-1}$ s$^{-1}$) GaAs two-dimensional electron gas. We use polarization-sensitive ultrafast terahertz magnetospectroscopy to resolve the on-axis and off-diagonal Hall conductivity elements. We focus our measurements near cyclotron resonance to determine the line width from 0.4 K to 100 K at $\pm$1.25 T. This line width decreases monotonically with temperature and does not saturate at the lowest temperatures measured. In this talk, we will develop a model of these data to discuss the relative influence of electron-electron, electron-phonon, and impurity scattering on the temperature dependent sample mobility.

*We acknowledge support from Dept. of Education Grant No. P200A090143 and from NHMFL-UCGP.

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Authors

  • Jeremy Curtis

    • University of Alabama at Birmingham

  • Jon Moore

    • University of Alabama at Birmingham

  • Takahisa Tokumoto

    • National High Magnetic Field Lab. / Florida State Univ.
    • National High Magnetic Field Lab
    • National High Magnetic Field Laboratory

  • Judy Cherian

    • National High Magnetic Field Lab
    • National High Magnetic Field Laboratory

  • J. Kono

    • Rice University
    • ECE Dept., Rice University

  • Alexey Belyanin

    • Department of Physics, Texas A\&M University, College Station, TX
    • Physics Dept., Texas A\&M University
    • Texas A\&M University

  • Stephen McGill

    • National High Magnetic Filed Laboratory
    • National High Magnetic Field Lab
    • National High Magnetic Field Laboratory

  • David Hilton

    • University of Alabama at Birmingham