Interferometer parameters that allow observation of non-Abelian e/4 properties.

ORAL

Abstract

Fabry-Perot interferometers have been used to examine 5/2 filling factor, and have shown interference consistent with Abelian e/2 charges and non-Abelian e/4 charges. Simple magnetic field sweeps and independently side gate sweeps can each expose even-odd effects indicating non-Abelian e/4. These results have been compiled using a series of different heterostructure types, different illumination procedures, and different interferometer geometries, sizes, and gate charging procedures. In this talk summary results will be presented, but the focus will be these device parameters and procedures employed to reveal the non-Abelian properties. Central to this effort is the use of heterostructures that require illumination to produce high mobilities. The illumination and charging protocols exercised on different fundamental heterostructure types will be described, including the consequences, both good and bad, on 5/2 interference. Given these advantages and constraints on the 2D electron material systems, means to mitigate problems in the measurements by adjusting the interference devices themselves will be discussed.

*work at Princeton University funded by Gordon and Betty Moore Foundation, EPiQS initiative Grant GBMF4420, & National Science Foundation MRSEC Grant DMR-1420541

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Presenters

  • Robert Willett

    • physical sciences, Nokia Bell Labs
    • Bell Labs

Authors

  • Robert Willett

    • physical sciences, Nokia Bell Labs
    • Bell Labs

  • Kirill Shtengel

    • Dept. of Physics, U.C. Riverside
    • Univ of California - Riverside
    • University of California, Riverside

  • Michael Manfra

    • Purdue University
    • Microsoft
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907 USA
    • Microsoft Station Q Purdue
    • Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, School of Materials Engineering and School of Electrical and Computer Engineering, Purdue University
    • Station Q Purdue and Department of Physics and Astronomy, Purdue University
    • Dept. of Physics, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
    • Dept. of Physics and Astronomy, Purdue
    • Purdue University, Station Q Purdue
    • Department of Physics and Astronomy, Station Q Purdue, and Birck Nanotechnology Center, Purdue University

  • Loren Pfeiffer

    • Electrical Engineering, Princeton University
    • Princeton University
    • Princeton Univ
    • Department of Electrical Engineering, Princeton University
    • PRISM, Princeton University
    • Physics, Princeton University
    • Electrical Engineering, Princeton

  • Saeed Fallahi

    • Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907 USA
    • Purdue University
    • Department of Physics and Astronomy, Purdue University
    • Dept. of Physics, Purdue University
    • Dept. of Physics and Astronomy, Purdue

  • Geoffrey Gardner

    • Department of Physics and Astronomy, Purdue University
    • Purdue University
    • Birck Nano Technology Center, Purdue University
    • Dept. of Physics, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy, Station Q Purdue, and Birck Nanotechnology Center, Purdue University

  • Kenneth West

    • Electrical Engineering, Princeton University
    • Princeton University
    • Princeton Univ
    • Department of Electrical Engineering, Princeton University
    • PRISM, Princeton University
    • Physics, University of Pittsburgh
    • Electrical Engineering, Princeton

  • Kirk Baldwin

    • Princeton University
    • Electrical Engineering, Princeton University
    • PRISM, Princeton University