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Synchronization of Large Josephson-Junction Arrays by Traveling Electromagnetic Waves
Stockholm University, Faculty of Science, Department of Physics. Institute for Physics of Microstructures RAS, Russia.
Stockholm University, Faculty of Science, Department of Physics.
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Number of Authors: 72018 (English)In: Physical Review Applied, E-ISSN 2331-7019, Vol. 9, no 5, article id 054032Article in journal (Refereed) Published
Abstract [en]

Mutual synchronization of many Josephson junctions is required for superradiant enhancement of the emission power. However, the larger the junction array is, the more difficult is the synchronization, especially when the array size becomes much larger than the emitted wavelength. Here, we study experimentally Josephson emission from such larger-than-the-wavelength Nb/NbSi/Nb junction arrays. For one of the arrays we observe a clear superradiant enhancement of emission above a threshold number of active junctions. The arrays exhibit strong geometrical resonances, seen as steps in current-voltage characteristics. However, radiation patterns of the arrays have forward-backward asymmetry, which is inconsistent with the solely geometrical resonance (standing-wave) mechanism of synchronization. We argue that the asymmetry provides evidence for an alternative mechanism of synchronization mediated by unidirectional traveling-wave propagation along the array (such as a surface plasmon). In this case, emission occurs predominantly in the direction of propagation of the traveling wave. Our conclusions are supported by numerical modeling of Josephson traveling-wave antenna. We argue that such a nonresonant mechanism of synchronization opens a possibility for phase locking of very large arrays of oscillators.

Place, publisher, year, edition, pages
2018. Vol. 9, no 5, article id 054032
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-157734DOI: 10.1103/PhysRevApplied.9.054032ISI: 000433041700002OAI: oai:DiVA.org:su-157734DiVA, id: diva2:1236648
Available from: 2018-08-03 Created: 2018-08-03 Last updated: 2018-08-06Bibliographically approved

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Borodianskyi, Evgenii A.Krasnov, Vladimir M.
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