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Nonlocal Long-Range Synchronization of Planar Josephson-Junction Arrays
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Institute for Physics of Microstructures RAS, Russia.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.ORCID-id: 0000-0002-5935-7165
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.ORCID-id: 0000-0002-3131-8658
Antal upphovsmän: 32022 (Engelska)Ingår i: Physical Review Applied, E-ISSN 2331-7019, Vol. 17, nr 6, artikel-id 064032Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We study arrays of planar Nb Josephson junctions with contacts to intermediate electrodes, which allow measurements of individual junctions and, thus, provide an insight into intricate array dynamics. We observe strong indications for array phase locking, despite a significant interjunction separation. Several unusual phenomena are reported, such as a bistable critical current with reentrant superconductivity upon switching of nearby junctions; and “incorrect” Shapiro steps, occurring at mixing frequencies between the external rf radiation and the internal Josephson frequency in nearby junctions. Our results reveal a surprisingly strong and long-range interjunction interaction, which is attributed to nonlocality of planar-junction electrodynamics, caused by the long-range spreading of stray electromagnetic fields. The nonlocality greatly enhances the high-frequency interjunction coupling and enables large-scale synchronization. Therefore, we conclude that planar geometry is advantageous for the realization of coherent Josephson electronics.

Ort, förlag, år, upplaga, sidor
2022. Vol. 17, nr 6, artikel-id 064032
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Den kondenserade materiens fysik
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URN: urn:nbn:se:su:diva-207438DOI: 10.1103/PhysRevApplied.17.064032ISI: 000817873900001OAI: oai:DiVA.org:su-207438DiVA, id: diva2:1684475
Tillgänglig från: 2022-07-26 Skapad: 2022-07-26 Senast uppdaterad: 2022-07-26Bibliografiskt granskad

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Cattaneo, RogerKrasnov, Vladimir M.

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