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Fabry-Perot interferometry of fractional quantum Hall edge states

ORAL

Abstract

Electronic interferometry has been proposed as an experimental probe of the braiding statistics and quasiparticle charge in quantum Hall states. Two significant challenges in Fabry-Perot interferometers are Coulomb charging effects and poor phase coherence. We have overcome these challenges using a novel GaAs/AlGaAs heterostructure which utilizes auxiliary GaAs screening wells in addition to the primary quantum well in order to screen and suppress Coulomb charging effects. This heterostructure design has enabled measurements of robust Aharonov-Bohm interfere at the ν = 1/3 fractional quantum Hall state. A recent theoretical work has predicted a shift in the interference pattern at ν = 1/3 when the magnetic field is varied from the center of the plateau. We present experimental measurements of Aharonov-Bohm interference across the 1/3 plateau. These results represent progress towards direct observation of anyonic braiding statistics.

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Presenters

  • James Nakamura

    Physics, Purdue University

Authors

  • James Nakamura

    Physics, Purdue University

  • Saeed Fallahi

    Physics and Astronomy, Purdue University, Purdue University, Department of Physics and Astronomy, Microsoft Quantum Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA, Physics, Purdue University

  • Harshad Sahasrabudhe

    Physics, Purdue University

  • Shuang Liang

    Physics, Purdue University

  • Geoff C Gardner

    Purdue University, Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University, Department of Physics and Astronomy and Station Q Purdue, Purdue University, Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907, USA, Microsoft Quantum Purdue, Department of Physics and Astronomy, Microsoft Quantum Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA, Physics, Purdue University

  • Michael Manfra

    Physics and Astronomy, Purdue Univ, Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, School of Materials Engineering, School of Electrical and Computer Engineering, Purdue, Purdue Univ, Purdue University, Microsoft Quantum at Station Q Purdue, Department of Physics and Astronomy, Birck Nanotechnology Center, Microsoft Quantum Purdue, School og Materials Engineering & School of Electrical and Computer Engineering, P, Physics and Astronomy, Purdue University, Department of Physics and Astronomy and Station Q Purdue, Purdue University, Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA, Department of Physics and Astronomy, PURDUE UNIVERSITY, Department of Physics and Astronomy, Microsoft Quantum Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA, Physics, Purdue University