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Nonreciprocal transport refers to charge transfer processes that are sensitive to the bias polarity. Until re- cently, nonreciprocal transport was studied only in dissipative systems, where the nonreciprocal quantity is the resistance. Recent experiments have, however, demonstrated nonreciprocal supercurrent leading to the observa- tion of a supercurrent diode effect in Rashba superconductors, opening the vision of dissipationless electronics. Here we report on supercurrent diode effect in NbSe2 nanowires obtained by patterning NbSe2 flakes with odd layer number. The observed rectification efficiency in NbSe2 can be as large as 50%, almost an order of magni- tude larger than the efficiency of devices based on Rashba superconductors. In agreement with recent theory for superconducting transition metal dichalcogenides, we show that the effect is driven by the out-of-plane magnetic field component. Remarkably, we find that the effect becomes field-asymmetric in the presence of an additional in-plane field component transverse to the current direction. Supercurrent anisotropy offers a further degree of freedom in designing superconducting power electronics with the high degree of integrability offered by van der Waals materials.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Nonreciprocal transport, supercurrent diode, NbSe2

Date published: 2022-07-23

Publisher: Springer Science and Business Media LLC

Journal:

• Nature Communications (ISSN: 20411723) vol. 13 issue. 1 4266

Funding:

• Deutsche Forschungsgemeinschaft 314695032
• EC | Horizon 2020 Framework Programme 862660

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

MDR DOI:

First published URL: https://doi.org/10.1038/s41467-022-31954-5

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Updated at: 2025-02-27 08:30:52 +0900

Published on MDR: 2025-02-27 08:30:53 +0900