Magnetic Field and Temperature Dependence of Decoherence in a High Mobility Landau Quantized 2DEG

ORAL

Abstract

We apply a perpendicular magnetic field to a high mobility ($\mu=3.4\times 10^{6}$ cm$^{2}$ V$^{-1}$ s$^{-1}$) two dimensional electron gas (2DEG) which splits the Fermi surface into a spectrum of Landau levels (LL). The highest filled and lowest unfilled LLs are coherently coupled by an incident THz pulse. The time required for carriers in this superposition state to become out of phase is the decoherence time. The focus of our work is to measure this decoherence time over a wide range of temperatures (0.4 K-100 K) and magnetic fields (1.25 T-17.5 T). Using THz time-domain spectroscopy (TTDS), we map the decoherence as a function of B and T. This talk will review previous work done at 0.4 K and 1.25 T; furthermore, we will discuss current work being done to increase our B dependence to 17.5 T using superconducting magnet 3 at the National High Magnetic Field Lab at Florida State University. This work utilizes a novel \emph{reflection} TTDS system.

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Authors

  • Jeremy Curtis

    University of Alabama at Birmingham, Department of Physics, University of Alabama at Birmingham

  • T.T. Tokumoto

    National High Magnetic Field Laboratory and Department of Physics, University of Alabama at Birmingham

  • J.G. Cherian

    Department of Physics, Florida State University

  • Chris Neu

    Florida State University, NHMFL, Institut Neel, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China, Florida State University, Department of Physics, Florida State University, Tallahassee, FL, Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, Florida State University, National High Magnetic Field Laboratory, Institute of Physics, Chinese Academy of Sciences, China, Austin Peay State University, University of Pardubice, Davidson College, Covenant College, Lookout Mtn, GA 30750, Russian Academy of Sciences, Moscow, RU, University of Tennessee Space Institute, Tullahoma, TN, USA, Sandia National Laboratories,* Albuquerque, NM, Arkansas State University, Jonesboro, AK, None, Mississippi State University, Mississippi State University Department of Physics and Astronomy, Florida State University and the National High Magnetic Field Laboratory, Faculte des Sciences et Techniques and Universite Aix-Marseille, MIT Haystack Observatory, Departments of Chemistry and Physics, University of Tennessee of Chattanooga, Departments of Chemistry and Physics, University of Tennessee at Chattanooga, Western Kentucky University, Thomas Jefferson National Accelerator Facility, Newport News, VA, Fermilab, University of Virginia and Fermilab, Indiana University Bloomington, Indiana University Health Proton Therapy Center, University of North Florida, National Superconducting Cyclotron Laboratory, Michigan State University, Flordia State University, Louisiana State University, Washington University, Argonne National Laboratory, Lawrence Berkeley National Laboratory, Department of Physics, Florida State University., JINR, Tsinghua University, LBNL, LBNL/Vanderbilt University, Vanderbilt University, Florida A\&M University, Georgia Institute of Technology, Department of Physics, Virginia Tech, Gatton Academy, Exeter University, Florida International University, Office of Research, University of North Florida, Physics Department, University of North Florida, NSCL, Michigan State University, Physics Department, Florida State University, University of Tennessee-Knoxville, Neel Institut, Kazan Federal University, Bielefeld University, Ben Gurion University, LCIB - CEA, University of Georgia, Lawrence Livermore National Laboratory, Livermore, CA 94550, NHMFL, Tallahassee, USA, Department of Chemistry, University of Waterloo, Ontario, Canada, NHMFL, Tallahassee FL 32310 USA, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany, Wigner Research Center for Physics, Budapest, Hungary, Experimental physics II, University of Augsburg, Germany, Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, National High Magnetic Field Laboratory Florida State University, Tallahassee, Florida 32310, IM2NP-CNRS (UMR 7334) and Universite Aix-Marseille, National High Magnetic Field Laboratory Applied Superconductivity Center, Heifei National Lab for Physical Science at Microscale, USTC, Institute of Physics, Chinese Academy of Sciences, Department of Electrical Engineering, Rice University, National High Magnetic Field Laboratory, National High Magnetic Field Laboratory/FSU, University of Virginia

  • Luke McClintock

    Department of Physics, University of Alabama at Birmingham

  • J.L. Reno

    Sandia National Laboratories

  • A. Belyanin

    Department of Physics, Texas A\&M University

  • J. Kono

    Department of Electrical Engineering, Rice University

  • S.A. McGill

    National High Magnetic Field Laboratory

  • D.J. Hilton

    Department of Physics, University of Alabama