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Quantum Numbers02:43

Quantum Numbers

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Quantum Hall effect at 0.002 T in graphene.

Alexander S Mayorov1, Ping Wang1,2, Xiaokai Yue3

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|January 21, 2026
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Summary
This summary is machine-generated.

This study introduces a novel double-layer graphene structure that significantly enhances carrier mobility by reducing sample inhomogeneities. This breakthrough enables deeper exploration of fundamental electronic interactions and graphene device applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene's precise carrier-density control is ideal for studying electronic interactions.
  • Sample inhomogeneities in graphene hinder exploration of low-density electronic regimes.
  • High carrier mobility is essential for fundamental research and device development in graphene.

Purpose of the Study:

  • To reduce external inhomogeneity in graphene samples.
  • To enhance carrier mobility for fundamental studies and device applications.
  • To investigate strongly correlated electronic phases in graphene-based heterostructures.

Main Methods:

  • Fabrication of a double-layer graphene architecture.
  • Utilizing an ultra-thin hexagonal boron nitride (hBN) layer for separation.
  • Employing mutual screening between graphene layers to reduce Coulomb scattering.

Main Results:

  • Achieved a quantum mobility exceeding 10^7 cm^2/Vs.
  • Observed Shubnikov-de Haas oscillations at magnetic fields below 1 mT.
  • Identified integer quantum Hall features at 0.002 T and a fractional quantum Hall plateau at vtot=-10/3 at 2 T.

Conclusions:

  • The double-layer graphene architecture effectively reduces inhomogeneity.
  • The enhanced mobility opens new avenues for fundamental electronic studies.
  • This platform is suitable for investigating strongly correlated electronic phases in graphene.