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Interference of higher-order fractional quantum Hall states in Fabry-Perot interferometers

ORAL

Abstract

Fabry Perot interferometry can be used to probe the fractional charge and statistics of quasiparticles in the fractional quantum Hall regime. We have measured interference at the v = 2/3 fractional quantum Hall state, which is the hole-conjugate to the Laughlin v = 1/3 state. Measurements at different quantum point contact operating points indicate that two different edge states are present. The dominant frequencies present in FFTs of the conductance oscillations are consistent with the edge structure proposed by Macdonald consisting of an outer integer mode and an inner counterpropagating fractional mode. However, the fine structure in the data shows additional features which have not been seen at other quantum Hall states, and require additional investigation to interpret.

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Presenters

  • James R Nakamura

    Purdue University

Authors

  • James R Nakamura

    Purdue University

  • Shuang Liang

    Purdue University

  • Geoffrey C Gardner

    Purdue University

  • Michael J Manfra

    Purdue University, Microsoft Quantum Purdue, Purdue University, Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA; Microsoft Quantum Lab, Purdue University, West Lafayette, IN, USA, Physics and Astronomy, Purdue University, Department of Physics and Astronomy, Birck Nanotechnology Center, School of Electrical and Computer Engineering and Microsoft Quantum Lab West Lafayette, Purdue University, Department of Physics and Astronomy and Nanotechnology Center Purdue University, Microsoft Quantum Lab West Lafayette, Department of Physics and Astronomy, Birck Nanotechnology Center, School of Materials Engineering and School of Electrical and Computer Engineering, Purdue University