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The combination of superconductivity and quantum Hall (QH) effect is regarded as a key milestone towards topological quantum computation in solid-state systems. Recent results based on quantum interference indicate that QH edge states can effectively mediate a supercurrent across high-quality graphene weak links. In this work we report the observation of a supercurrent tied to transitions between adjacent QH plateaus, where transport paths develop within the compressible two-dimensional bulk. We employ a back-gated graphene Josephson junction, comprising high-mobility CVD- grown graphene encapsulated in hexagonal Boron Nitride (hBN) and contacted by Nb leads. We detect superconducting pockets persisting beyond the QH onset, up to 2.4 T, hence approaching the upper critical field of the Nb contacts. We reveal an approximate Φ0 = h/2e periodicity of the QH-supercurrent as a function of the magnetic field, indicating superconducting interference in a proximitized percolative phase. These results establish a possible experimental platform to investigate the transport regime of percolative supercurrent, exploiting the flexibility of van der Waals devices.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: supercurrent, quantum Hall effect
, Josephson junction

Date published: 2025-08-05

Publisher: American Chemical Society (ACS)

Journal:

• ACS Nano (ISSN: 1936086X) vol. 19 issue. 30 p. 27370-27378

Funding:

• HORIZON EUROPE European Innovation Council 101057977
• Core Research for Evolutional Science and Technology JPMJCR24A5
• H2020 Future and Emerging Technologies 964398
• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052
• Japan Science and Technology Agency
• Ministero dell'Universit? e della Ricerca PE0000023-NQSTI

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1021/acsnano.5c05294

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Updated at: 2026-05-25 08:51:45 +0900

Published on MDR: 2026-05-25 10:29:20 +0900