Effect of density on the amplitude of microwave-induced resistance oscillations

POSTER

Abstract

We have measured microwave-induced resistance oscillations (MIRO) in a tunable-density 30 nm-wide GaAs/AlGaAs quantum well and observed that the MIRO amplitude increases dramatically with carrier density. The analysis shows that the increase in the effective microwave power and quantum lifetime with density are not sufficient to explain the observed growth of the oscillation amplitude. We further found that the fundamental MIRO extrema move towards cyclotron resonance with increasing density, in contrast to theoretical predictions. These unexpected findings reveal that the density dependence is not captured by existing theory.

*The work at Minnesota (Purdue) was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award No. ER 46640-SC0002567 (DE-SC0006671).

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

  • 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