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A tunable Fabry-Pérot quantum Hall interferometer in graphene.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Hall Effect
  • Materials Science

Background:

  • Electron interferometry in quantum Hall (QH) edge channels is crucial for understanding anyonic excitations.
  • Semiconductor heterostructures suffer from charging effects that hinder Aharonov-Bohm interference in QH interferometers.
  • Advanced charge-screening methods are often required to overcome these limitations in semiconductor-based systems.

Purpose of the Study:

  • To investigate high-mobility monolayer graphene as a material for Fabry-Pérot quantum Hall interferometry.
  • To demonstrate the feasibility of performing QH interferometry in graphene without detrimental charging effects.
  • To explore the potential of graphene for probing anyonic excitations in QH states.

Main Methods:

  • Fabrication of graphene devices with gate-tunable quantum point contacts.
  • Utilizing the edge channels of the zeroth Landau level in monolayer graphene.
  • Performing Fabry-Pérot quantum Hall interferometry and measuring Aharonov-Bohm interference patterns.

Main Results:

  • Observed high-visibility Aharonov-Bohm interference in graphene QH interferometers, free from charging effects.
  • Demonstrated wide tunability of interference patterns via electrostatic gating and magnetic fields.
  • Achieved a coherence length of 10 micrometers at 0.02 K, enabling double Fabry-Pérot interferometry.

Conclusions:

  • High-mobility monolayer graphene is a promising alternative material for quantum Hall interferometry due to its lack of charging effects.
  • Graphene-based QH interferometers exhibit tunable, high-visibility interference, agreeing with theoretical predictions.
  • Future research with graphene devices could unlock investigations into anyonic excitations in fractional QH states.