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Charging of Superconducting Layers in Arrays of Coupled Josephson Junctions for Overcritical Currents

1,2,† and 2,3,*,†
1
National Institute for Physics and Nuclear Engineering, Department of Theoretical Physics, P.O. Box MG-6, RO-077125 Bucharest-Magurele, Romania
2
Faculty of Physics, University of Bucharest, Magurele, 077125 Ilfov, Romania
3
National Institute of Plasma Lasers and Radiation Physics, Magurele, RO-077125 Ilfov, Romania
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Crystals 2019, 9(7), 327; https://doi.org/10.3390/cryst9070327
Received: 19 April 2019 / Revised: 18 June 2019 / Accepted: 22 June 2019 / Published: 27 June 2019
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Abstract

In this work, we effectuated the numerical simulations of the phase dynamics of an array of Josephson junctions taking into account the capacitive coupling between the neighboring junctions and the diffusion current in the stack. We observed that, if we increase the coupling and the dissipation parameters, the IV characteristic changes qualitatively from the IV characteristics studied before. For currents greater than the critical one, we obtained an additional branch in the IV characteristics. This branch is characterized by a lower voltage than the outermost one. Moreover, we obtained an additional charging of the superconducting layers in the IV region for currents greater than the critical one. We studied the time evolution of this charging by the means of Fast Fourier Transform. We proved that the charge density wave associated with this charging has a complex spectral structure. In addition, we analyzed the behavior of the system for different boundary conditions, appropriate to different experimental setups. View Full-Text
Keywords: Josephson junctions; overcritical currents; travelling waves; hysteresis; branching Josephson junctions; overcritical currents; travelling waves; hysteresis; branching
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Cuzminschi, M.; Zubarev, A. Charging of Superconducting Layers in Arrays of Coupled Josephson Junctions for Overcritical Currents. Crystals 2019, 9, 327.

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