Intrinsic supercurrent non-reciprocity coupled to the crystal structure of a van der Waals Josephson barrieropen access
- Authors
- Kim, Jae-Keun; Jeon, Kun-Rok; Sivakumar, Pranava K.; Jeon, Jaechun; Koerner, Chris; Woltersdorf, Georg; Parkin, Stuart S. P.
- Issue Date
- Feb-2024
- Publisher
- Nature Research
- Citation
- Nature Communications, v.15, no.1
- Journal Title
- Nature Communications
- Volume
- 15
- Number
- 1
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/72903
- DOI
- 10.1038/s41467-024-45298-9
- ISSN
- 2041-1723
2041-1723
- 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. © The Author(s) 2024.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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