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Direct Visualization of Phase-Locking of Large Josephson Junction Arrays by Surface Electromagnetic Waves
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.ORCID-id: 0000-0003-4815-5856
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Rekke forfattare: 82020 (engelsk)Inngår i: Physical Review Applied, E-ISSN 2331-7019, Vol. 14, nr 2, artikkel-id 024051Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Phase-locking of oscillators leads to super-radiant amplification of the emission power. This is particularly important for development of terahertz sources, which suffer from low emission efficiency. In this work we study large Josephson junction arrays containing several thousand Nb-based junctions. Using low-temperature scanning laser microscopy, we observe that at certain bias conditions two-dimensional standing-wave patterns are formed, manifesting themselves as global synchronization of the arrays. Analysis of standing waves indicates that they are formed by surface plasmon-type electromagnetic waves propagating at the electrode-substrate interface. Thus, we demonstrate that surface waves provide an effective mechanism for long-range coupling and phase-locking of large junction arrays.

sted, utgiver, år, opplag, sider
2020. Vol. 14, nr 2, artikkel-id 024051
Emneord [en]
Superconductivity, THz sources, Josephson junctions
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-185345DOI: 10.1103/PhysRevApplied.14.024051ISI: 000561848600002Scopus ID: 2-s2.0-85091973486OAI: oai:DiVA.org:su-185345DiVA, id: diva2:1506529
Tilgjengelig fra: 2020-12-03 Laget: 2020-12-03 Sist oppdatert: 2022-11-08bibliografisk kontrollert

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Borodianskyi, Evgenii A.Krasnov, Vladimir M.

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