Fluxons in high-impedance long Josephson junctions
- URL: http://arxiv.org/abs/2111.14702v1
- Date: Mon, 29 Nov 2021 17:01:48 GMT
- Title: Fluxons in high-impedance long Josephson junctions
- Authors: Micha Wildermuth, Lukas Powalla, Jan Nicolas Voss, Yannick Sch\"on,
Andre Schneider, Mikhail V. Fistul, Hannes Rotzinger, Alexey V. Ustinov
- Abstract summary: We experimentally demonstrate slowing down relativistic fluxons in long Josephson junctions.
The amount of magnetic flux carried by each supercurrent vortex is significantly smaller than the magnetic flux quantum.
At the same time, the characteristic impedance is increased by an order of magnitude, which makes these junctions suitable for a variety of applications in superconducting electronics.
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- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The dynamics of fluxons in long Josephson junctions is a well-known example
of soliton physics and allows for studying highly nonlinear relativistic
electrodynamics on a microscopic scale. Such fluxons are supercurrent vortices
that can be accelerated by a bias current up to the Swihart velocity, which is
the characteristic velocity of electromagnetic waves in the junction. We
experimentally demonstrate slowing down relativistic fluxons in Josephson
junctions whose bulk superconducting electrodes are replaced by thin films of a
high kinetic inductance superconductor. Here, the amount of magnetic flux
carried by each supercurrent vortex is significantly smaller than the magnetic
flux quantum $ \Phi_0 $. Our data show that the Swihart velocity is reduced by
about one order of magnitude compared to conventional long Josephson junctions.
At the same time, the characteristic impedance is increased by an order of
magnitude, which makes these junctions suitable for a variety of applications
in superconducting electronics.
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