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Nonlocal Long-Range Synchronization of Planar Josephson-Junction Arrays
Stockholm University, Faculty of Science, Department of Physics. Institute for Physics of Microstructures RAS, Russia.
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0002-5935-7165
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0002-3131-8658
Number of Authors: 32022 (English)In: Physical Review Applied, E-ISSN 2331-7019, Vol. 17, no 6, article id 064032Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
2022. Vol. 17, no 6, article id 064032
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:su:diva-207438DOI: 10.1103/PhysRevApplied.17.064032ISI: 000817873900001OAI: oai:DiVA.org:su-207438DiVA, id: diva2:1684475
Available from: 2022-07-26 Created: 2022-07-26 Last updated: 2022-07-26Bibliographically approved

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Cattaneo, RogerKrasnov, Vladimir M.

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