Aharonov-Bohm interference of integer and fractional quantum Hall edge modes in small electronic Fabry-Perot interferometers

ORAL

Abstract

Electronic Fabry-Perot interferometers may be used to probe quantum Hall edge states; however, Coulomb charging effects complicate the operation of small devices. We implement a novel GaAs/AlGaAs heterostructure design in which Coulomb charging effects are suppressed, enabling operation of small interferometers in the Aharonov-Bohm regime with high quantum coherence. We present measurements of the selective interference of inner and outer edge states in the integer quantum Hall regime. Aharonov-Bohm oscillations are observed at the fractional quantum Hall states ν = 2/3 and ν = 1/3.

–

Presenters

  • James Nakamura

    Purdue University

Authors

  • James Nakamura

    Purdue University

  • 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

  • Shuang Liang

    Purdue University

  • 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

  • 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