Article Andreev Reflection in the Fractional Quantum Hall State

Önder Gül ; Yuval Ronen ; Si Young Lee ; Hassan Shapourian ; Jonathan Zauberman ; Young Hee Lee ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Ashvin Vishwanath ; Amir Yacoby ; Philip Kim

PhysRevX.12.021057.pdf
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Önder Gül, Yuval Ronen, Si Young Lee, Hassan Shapourian, Jonathan Zauberman, Young Hee Lee, Kenji Watanabe, Takashi Taniguchi, Ashvin Vishwanath, Amir Yacoby, Philip Kim. Andreev Reflection in the Fractional Quantum Hall State. Physical Review X. 2022, 12 (2), 021057.
SAMURAI

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(abstract)

We construct high-quality graphene-based van der Waals devices with narrow superconducting niobium nitride (NbN) electrodes, in which superconductivity and a robust fractional quantum Hall (FQH) state coexist. We find a possible signature for crossed Andreev reflection (CAR) across the superconductor separating two FQH edges. Our observed CAR probabilities in the particlelike fractional fillings are markedly higher than those in the integer and hole-conjugate fractional fillings and depend strongly on temperature and magnetic field unlike the other fillings. Further, we find a filling-independent CAR probability in integer fillings, which we attribute to spin-orbit coupling in NbN allowing for Andreev reflection between spin-polarized edges. These results provide a route to realize novel topological superconducting phases in FQH-superconductor hybrid devices based on graphene and NbN.

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Keyword: Graphene-based devices, superconducting niobium nitride, fractional quantum Hall

Date published: 2022-06-14

Publisher: American Physical Society (APS)

Journal:

  • Physical Review X (ISSN: 21603308) vol. 12 issue. 2 021057

Funding:

  • Simons Foundation 651440
  • Nederlandse Organisatie voor Wetenschappelijk Onderzoek
  • U.S. Department of Energy DE-SC0012260
  • U.S. Department of Energy DE-SC0019300
  • National Science Foundation 1936263
  • National Science Foundation DMR-1708688
  • National Science Foundation DMR-1231319
  • National Science Foundation ECS-00335765
  • Institute for Basic Science IBS-R011-D1
  • Ministry of Education, Culture, Sports, Science and Technology JPMXP0112101001
  • Japan Society for the Promotion of Science 19H05790
  • Japan Society for the Promotion of Science JP20H00354

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

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First published URL: https://doi.org/10.1103/physrevx.12.021057

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Updated at: 2025-02-28 16:30:40 +0900

Published on MDR: 2025-02-28 16:30:41 +0900

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