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Hard and Soft Phase Slips in a Fabry-Pérot Quantum Hall Interferometer.

N L Samuelson1, L A Cohen1, W Wang1

  • 1University of California at Santa Barbara, Department of Physics, Santa Barbara, California 93106, USA.

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|July 31, 2025
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Summary
This summary is machine-generated.

Quantum Hall interferometers reveal slow quasiparticle dynamics. We observed phase slips indicating quasiparticle entry into the interferometer bulk, with equilibration times up to several minutes, distinguishing between uniform and defect-localized quasiparticles.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Optics
  • Materials Science

Background:

  • Quantum Hall Fabry-Pérot interferometers probe bulk quasiparticle properties and bulk-edge coupling.
  • Previous research assumed rapid quasiparticle exchange with the interferometer, neglecting slow dynamics.

Purpose of the Study:

  • Investigate the role of quasiparticle equilibration time in quantum Hall interferometers.
  • Characterize quasiparticle dynamics and their impact on interference phase.
  • Differentiate between various quasiparticle localization mechanisms within the interferometer.

Main Methods:

  • Fabrication and measurement of a monolayer graphene quantum Hall interferometer.
  • Operation in the integer quantum Hall regime at filling factors ν=-1 and ν=-2.
  • Analysis of quantum interference phase slips as a function of magnetic field.

Main Results:

  • Observed phase slips directly linked to quasiparticle entry into the interferometer bulk.
  • Determined quasiparticle equilibration times, revealing they can extend to several minutes.
  • Identified two distinct classes of phase slips: those from uniformly coupled bulk puddles and those from defect-trapped quasiparticles.

Conclusions:

  • Quasiparticle equilibration in quantum Hall interferometers can be significantly slow, challenging previous equilibrium assumptions.
  • The observed phase slips provide a sensitive probe of quasiparticle dynamics and localization.
  • Distinguishing between different quasiparticle states offers new insights into disorder and interactions in quantum Hall systems.