Andreev processes in mesoscopic multiterminal graphene Josephson junctions

There is growing interest in using multiterminal Josephson junctions (MTJJs) as a platform to artificially emulate topological phases and to investigate superconducting mechanisms such as multiplet Cooper pairings. Current experimental signatures in MTJJs have led to conflicting interpretations of the salient features. In this work, we report a collaborative experimental and theoretical investigation of graphene-based four-terminal Josephson junctions. We observe resonant features in the differential resistance maps that resemble those ascribed to multiplet Cooper pairings. To understand these features, we model our junctions using a circuit network of resistively and capacitively shunted junctions (RCSJs). We find that the RCSJ model successfully reproduces the observed multiplet features. Therefore, our study suggests that differential resistance measurements alone are insufficient to conclusively distinguish resonant Andreev reflection processes from semiclassical circuit-network effects.

© American Physical Society (APS) [Andreev processes in mesoscopic multiterminal graphene Josephson junctions. Physical Review B 107, 14 (2023)]

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Work Title Andreev processes in mesoscopic multiterminal graphene Josephson junctions
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Open Access
Creators
  1. Fan Zhang
  2. Asmaul Smitha Rashid
  3. Mostafa Tanhayi Ahari
  4. Wei Zhang
  5. Krishnan Mekkanamkulam Ananthanarayanan
  6. Run Xiao
  7. George J. De Coster
  8. Matthew J. Gilbert
  9. Nitin Samarth
  10. Morteza Kayyalha
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Physical Review B
Publication Date April 12, 2023
Publisher Identifier (DOI)
  1. https://doi.org/10.1103/PhysRevB.107.L140503
Deposited January 23, 2024

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Version 1
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  • Created
  • Added 2210.04408-1.pdf
  • Added Creator Fan Zhang
  • Added Creator Asmaul Smitha Rashid
  • Added Creator Mostafa Tanhayi Ahari
  • Added Creator Wei Zhang
  • Added Creator Krishnan Mekkanamkulam Ananthanarayanan
  • Added Creator Run Xiao
  • Added Creator George J. De Coster
  • Added Creator Matthew J. Gilbert
  • Added Creator Nitin Samarth
  • Added Creator Morteza Kayyalha
  • Published
  • Updated Publisher Show Changes
    Publisher
    • Physical Review B-Condensed Matter
    • Physical Review B
  • Updated