Temperature Dependence of Cyclotron Decoherance Time in a High Mobility Two-Dimensional Electron Gas

ORAL

Abstract

Using time-domain THz magneto-spectroscopy, we studied the dynamics of a 2DEG ($\mu =3.4\times 10^{6}\mathrm{cm}^{2}\,\mathrm{V}^{-1}\,\mathrm{s}^{-1}$) as a function of temperature ($0.4$K-$100$K).The decoherence lifetimes increase monotonically as temperature decreases below 1 K, which we have fit to a power law ($\tau \sim T^{0.29}$). We will discuss the mechanisms that contribute to the lifetimes. The transmitted pulse amplitude increases from 0.4K-1.2K, saturates from 1.5K-25K, and decreases from 50K-100K. J. A. Curtis is supported by a US Dept. Education GAANN Fellowship (P200A090143).

–

Authors

  • J.A. Curtis

    • Department of Physics, University of Alabama, Birmingham, Alabama 35294

  • J.D. Moore

    • Department of Physics, University of Alabama, Birmingham, Alabama 35294

  • T.T. Tokumoto

    • National High Magnetic Field Lab, Florida State University, Tallahassee, Florida 32310

  • J.G. Cherian

    • National High Magnetic Field Laboratory
    • Department of Physics, Florida State University, Tallahassee, Florida 32310

  • X. Wang

    • Department of Electrical Engineering, Rice University, Houston, Texas 77005

  • J.L. Reno

    • Sandia National Laboratories, Albuquerque, New Mexico 87185

  • Alexey Belyanin

    • Department of Physics, Texas A\&M University, College Station, Texas 77843
    • Department of Physics and Astronomy, Texas A\&M University

  • J. Kono

    • Department of Electrical \& Computer Engineering, Rice University
    • Rice University
    • Department of Electrical and Computer Engineering, Rice University
    • Department of Electrical Engineering, Rice University, Houston, Texas 77005
    • ECE Dept., Rice University
    • Dept. of Electrical and Computer Engineering, Rice University
    • Rice Univ.

  • S.A. McGill

    • National High Magnetic Field Laboratory
    • National High Magnetic Field Laboratory, Tallahassee, FL
    • National High Magnetic Field Lab, Florida State University, Tallahassee, Florida 32310

  • D.J. Hilton

    • Department of Physics, University of Alabama, Birmingham, Alabama 35294