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Two mechanisms of Josephson phase shift generation by an Abrikosov vortex
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. State University, Russia.ORCID-id: 0000-0002-3131-8658
Rekke forfattare: 32019 (engelsk)Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, nr 17, artikkel-id 174511Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Abrikosov vortices contain magnetic fields and circulating currents that decay at a short range λ∼100 nm. However, vortices can induce Josephson phase shifts at a long range r∼μm≫λ. Mechanisms of this puzzling phenomenon are not clearly understood. Here we present a systematic study of vortex-induced phase shifts in planar Josephson junctions. We make two key observations: (i) The cutoff effect: Although vortex-induced phase shift is a long-range phenomenon, it is terminated by the junction and does not persist beyond it. (ii) A linear to superlinear crossover with a rapid upturn of the phase shift occurs upon approaching a vortex to a junction. The crossover occurs at a vortex-junction distance comparable to the penetration depth. Together with theoretical and numerical analysis this allows unambiguous identification of two distinct and independent mechanisms. The short range r≲λ mechanism is due to circulating vortex currents inside a superconducting electrode without involvement of magnetic fields. The long range r≫λ mechanism is due to stray magnetic fields outside electrodes without circulating vortex currents. We argue that understanding of controlling parameters of vortex-induced Josephson phase shift can be used for development of novel compact cryoelectronic devices.

sted, utgiver, år, opplag, sider
2019. Vol. 100, nr 17, artikkel-id 174511
Emneord [en]
Aharonov-Bohm effect, Josephson effect, Vortices in superconductors
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-176527DOI: 10.1103/PhysRevB.100.174511ISI: 000495946800006Scopus ID: 2-s2.0-85075526518OAI: oai:DiVA.org:su-176527DiVA, id: diva2:1380503
Tilgjengelig fra: 2019-12-19 Laget: 2019-12-19 Sist oppdatert: 2022-11-04bibliografisk kontrollert

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Golod, TarasPagliero, AlessandroKrasnov, Vladimir M.

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