Effective mass from microwave photoresistance in high-mobility 2D electron systems

ORAL

Abstract

We have performed microwave photoresistance measurements in high mobility GaAs/AlGaAs quantum wells and investigated the value of the effective mass. Surprisingly, the effective mass, obtained from the period of microwave-induced resistance oscillations, is found to be considerably lower than the band mass in GaAs. This finding provides evidence for electron-electron interactions which can be probed by microwave photoresistance in very high Landau levels. In contrast, the measured magneto-plasmon dispersion revealed an effective mass which is close to the band mass, in accord with previous studies.

*The work at Minnesota and Purdue was supported by the DOE Grant Nos. DE-SC002567 and DE-SC0006671, respectively. The work at Princeton was partially funded by the Gordon and Betty Moore Foundation Foundation and the NSF MRSEC Program..

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Authors

  • Michael Zudov

    • University of Minnesota
    • School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA

  • Anthony Hatke

    • School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA

  • John Watson

    • Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA

  • Michael Manfra

    • Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA

  • Loren Pfeiffer

    • Princeton University, Department of Electrical Engineering, Princeton, New Jersey 08544, USA

  • Kenneth West

    • Princeton University, Department of Electrical Engineering, Princeton, New Jersey 08544, USA