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Intrinsic supercurrent non-reciprocity coupled to the crystal structure of a van der Waals Josephson barrier

Author

Listed:
  • Jae-Keun Kim

    (Max Planck Institute of Microstructure Physics, Weinberg 2)

  • Kun-Rok Jeon

    (Chung-Ang University (CAU))

  • Pranava K. Sivakumar

    (Max Planck Institute of Microstructure Physics, Weinberg 2)

  • Jaechun Jeon

    (Max Planck Institute of Microstructure Physics, Weinberg 2)

  • Chris Koerner

    (Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 3)

  • Georg Woltersdorf

    (Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 3)

  • Stuart S. P. Parkin

    (Max Planck Institute of Microstructure Physics, Weinberg 2)

Abstract

Non-reciprocal electronic transport in a spatially homogeneous system arises from the simultaneous breaking of inversion and time-reversal symmetries. Superconducting and Josephson diodes, a key ingredient for future non-dissipative quantum devices, have recently been realized. Only a few examples of a vertical superconducting diode effect have been reported and its mechanism, especially whether intrinsic or extrinsic, remains elusive. Here we demonstrate a substantial supercurrent non-reciprocity in a van der Waals vertical Josephson junction formed with a Td-WTe2 barrier and NbSe2 electrodes that clearly reflects the intrinsic crystal structure of Td-WTe2. The Josephson diode efficiency increases with the Td-WTe2 thickness up to critical thickness, and all junctions, irrespective of the barrier thickness, reveal magneto-chiral characteristics with respect to a mirror plane of Td-WTe2. Our results, together with the twist-angle-tuned magneto-chirality of a Td-WTe2 double-barrier junction, show that two-dimensional materials promise vertical Josephson diodes with high efficiency and tunability.

Suggested Citation

  • Jae-Keun Kim & Kun-Rok Jeon & Pranava K. Sivakumar & Jaechun Jeon & Chris Koerner & Georg Woltersdorf & Stuart S. P. Parkin, 2024. "Intrinsic supercurrent non-reciprocity coupled to the crystal structure of a van der Waals Josephson barrier," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45298-9
    DOI: 10.1038/s41467-024-45298-9
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