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