The Fluctuation Formation of Phase Solitons in Superconducting Two-Band Bridges

—Based on the Ginzburg–Landau theory, the dependence of the threshold energy δ F thr of formation of a phase slip center from the current for a superconducting two-band bridge has been calculated. It has been found that, in the case of sufficiently long bridges and a weak interband Josephson couplin...

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Bibliographic Details
Published inPhysics of the solid state Vol. 60; no. 11; pp. 2150 - 2156
Main Author Marychev, P. M.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.11.2018
Springer Nature B.V
Subjects
Bridges
COMPUTERIZED SIMULATION
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COUPLING
Dependence
FLUCTUATIONS
JOSEPHSON EFFECT
Physics
Physics and Astronomy
Solid State Physics
Solitary waves
SOLITONS
Superconductivity
SUPERCONDUCTORS
THRESHOLD ENERGY
Variation
Phase-slip Center (PSC)
Interband Coupling
Single-band Case
Fluctuation Formation
Soliton Phase
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Summary:—Based on the Ginzburg–Landau theory, the dependence of the threshold energy δ F thr of formation of a phase slip center from the current for a superconducting two-band bridge has been calculated. It has been found that, in the case of sufficiently long bridges and a weak interband Josephson coupling, there is a range of currents at which fluctuation transition from the state of the zero interband phase difference to the states with a phase soliton is possible, which manifests itself in a considerable decrease in the threshold energy δ F thr , and a fluctuation change in the number of phase solitons in the bridge. In the case of a strong interband coupling, no fluctuation formation of phase solitons occurs and the dependence δ F thr ( I ) tends to the expression obtained earlier by Langer and Ambegaokar for a single-band superconductor.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783418110197