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Quasi-Φ0-Periodic Supercurrent at Quantum Hall Transitions.

Ivan Villani1, Matteo Carrega2, Alessandro Crippa1

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This summary is machine-generated.

Researchers observed a supercurrent in graphene Josephson junctions, linking superconductivity and the quantum Hall effect. This finding advances topological quantum computation and offers a new platform for studying percolative supercurrents.

Keywords:
Josephson junctiongraphenequantum Hallquantum devicessupercurrent

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Topological Quantum Computation

Background:

  • The synergy between superconductivity and the quantum Hall (QH) effect is crucial for advancing topological quantum computation.
  • Previous studies indicated QH edge states could mediate supercurrents in graphene weak links.

Purpose of the Study:

  • To report the observation of a supercurrent linked to transitions between adjacent QH plateaus in graphene.
  • To investigate the transport regime of percolative supercurrents in van der Waals devices.

Main Methods:

  • Fabrication of a back-gated graphene Josephson junction using high-mobility CVD-grown graphene encapsulated in hexagonal Boron Nitride (hBN).
  • Contacting the graphene with Nb leads to form the Josephson junction.
  • Employing quantum interference studies and magnetic field sweeps to observe supercurrents.

Main Results:

  • Observation of a supercurrent associated with transitions between adjacent QH plateaus, with transport paths in the compressible bulk.
  • Detection of superconducting pockets persisting up to 2.4 T, near the Nb contacts' critical field.
  • Observation of an approximate Φ₀ = h/2e periodicity of the QH-supercurrent with magnetic field, indicating interference in a proximitized percolative phase.

Conclusions:

  • The study demonstrates a novel experimental platform for investigating percolative supercurrents in graphene.
  • The findings contribute to the understanding of hybrid superconducting-topological states for quantum technologies.
  • The flexibility of van der Waals devices offers new avenues for exploring exotic quantum phenomena.