Effect of low-temperature illumination on quantum lifetime in GaAs quantum wells

ORAL

Abstract

It is well known that low temperature illumination of a high-mobility two-dimensional electron gas hosted in GaAs quantum wells can greatly improve the quality of magnetotransport data even when the carrier density and mobility remain essentially unchanged. In high magnetic fields, this improvement is evident from the appearance or better development of fractional quantum Hall states as well as stripe and bubble phases. However, what exactly drives this improvement remain unclear. Here, we investigate the effect of illumination on microwave photoresistance in low magnetic fields. We find that the amplitude of microwave-induced resistance oscillations increases dramatically after low-temperature illumination. Dingle analysis reveals that illumination leads to a substantial increase in the single particle lifetime.

*The work at Minnesota was supported by DOE Award No. ER 46640-SC0002567 (DE-SC0006671). The work at Princeton was funded by the Gordon and Betty Moore Foundation through the EPiQS initiative Grant GBMF4420, and by the NSF MRSEC Grant DMR-1420541.

–

Presenters

  • Michael Zudov

    • Univ of Minnesota
    • Univ of Minn - Minneapolis
    • University of Minnesota

Authors

  • Michael Zudov

    • Univ of Minnesota
    • Univ of Minn - Minneapolis
    • University of Minnesota

  • X Fu

    • Univ of Minn - Minneapolis
    • University of Minnesota

  • Mikhail Borisov

    • Univ of Minn - Minneapolis

  • Geoffrey Gardner

    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Microsoft Station Q Purdue
    • Birck Nanotechnology Center, Purdue University
    • Purdue University, Station Q Purdue
    • Purdue Univ
    • Purdue University
    • Physics and Astronomy, Purdue University

  • John Watson

    • Microsoft Station-Q at Delft University of Technology
    • Purdue University

  • Michael Manfra

    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy and Microsoft Station Q Purdue, Purdue University
    • Purdue University
    • Physics, Purdue University
    • Purdue University, Station Q Purdue
    • Purdue Univ
    • Department of Physics and Astronomy, and School of Materials Engineering, and School of Electrical and Computer Engineering, Purdue University
    • Physics and Astronomy, Purdue University
    • Dept. of Physics and Astronomy, Purdue Univ

  • K Baldwin

    • Princeton University
    • Princeton Univ
    • Electrical Engineering, Princeton Univ
    • Department of Electrical Engineering, Princeton University
    • EE, Princeton University

  • Loren Pfeiffer

    • Electrical Engineering, princeton university
    • Department of Electrical Engineering, Princeton University
    • Princeton University
    • Princeton Univ
    • Electrical Engineering, Princeton Univ
    • EE, Princeton University

  • K West

    • Electrical Engineering, princeton university
    • Department of Electrical Engineering, Princeton University
    • Princeton University
    • Univ of Basel
    • Princeton Univ
    • Electrical Engineering, Princeton Univ
    • EE, Princeton University