Quasi-Φ<sub>0</sub>-Periodic Supercurrent at Quantum Hall Transitions
The combination of superconductivity and quantum Hall (QH) effect is regarded as a key milestone in advancing topological quantum computation in solid-state systems. Recent quantum interference studies suggest 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 associated with 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. Superconducting pockets are detected persisting beyond the QH onset, up to 2.4 T, hence approaching the upper critical field of the Nb contacts. We observe an approximate Φ<sub>0</sub> = <i>h</i>/2<i>e</i> periodicity of the QH-supercurrent as a function of the magnetic field, indicating superconducting interference in a proximitized percolative phase. These results provide a promising experimental platform to investigate the transport regime of percolative supercurrents, leveraging the flexibility of van der Waals devices.
Authors
- Sergio Pezzini (ORCID: https://orcid.org/0000-0003-4289-907X)
- Elia Strambini (ORCID: https://orcid.org/0000-0003-1135-2004)
- Stefan Heun (ORCID: https://orcid.org/0000-0003-1989-5679)
- Fabio Beltram (ORCID: https://orcid.org/0000-0002-6081-436X)
- Camilla Coletti (ORCID: https://orcid.org/0000-0002-8134-7633)
- Takashi Taniguchi (ORCID: https://orcid.org/0000-0002-1467-3105)
- Kenji Watanabe (ORCID: https://orcid.org/0000-0003-3701-8119)
- Vaidotas Mišeikis (ORCID: https://orcid.org/0000-0001-6263-4250)
- Matteo Carrega (ORCID: https://orcid.org/0000-0002-1956-7715)
- Alessandro Crippa (ORCID: https://orcid.org/0000-0002-2968-611X)
- Francesco Giazotto (ORCID: https://orcid.org/0000-0002-1844-4393)
- Ivan Villani (ORCID: https://orcid.org/0009-0003-2125-5838)
Institutions
- Scuola Normale Superiore (IT)
- National Institute for Materials Science (JP)
- Istituto Nanoscienze (IT)
- Superconducting and other Innovative Materials and Devices Institute (IT)
- Center for Nanotechnology Innovation (IT)
Publication Details
- Journal
- ACS Nano
- Published
- 2025-07-24
- DOI
- https://doi.org/10.1021/acsnano.5c05294
- Citations
- 1
- Primary Topic
- Graphene research and applications
- Type
- article
- Field-Weighted Citation Impact
- 0.52
Funders
- Ministero dell'Università e della Ricerca
- Japan Society for the Promotion of Science
- Japan Science and Technology Agency
- Core Research for Evolutional Science and Technology
- H2020 Future and Emerging Technologies
- HORIZON EUROPE European Innovation Council