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Title: Parametric amplification of vortex-antivortex pair generation in a Josephson junction
Authors: Berdiyorov, G.R.
Milosevic, M.V.
Savel'ev, Sergey
Kusmartsev, F.V.
Peeters, F.M.
Issue Date: 2014
Publisher: © The American Physical Society
Citation: BERDIYOROV, G.R. ... et al, 2014. Parametric amplification of vortex-antivortex pair generation in a Josephson junction. Physical Review B, 90 (13), 34505.
Abstract: Using advanced three-dimensional simulations, we show that an Abrikosov vortex, trapped inside a cavity perpendicular to an artificial Josephson junction, can serve as a very efficient source for generation of Josephson vortex-antivortex pairs in the presence of the applied electric current. In such a case, the nucleation rate of the pairs can be tuned in a broad range by an out-of-plane ac magnetic field in a broad range of frequencies. This parametrically amplified vortex-antivortex nucleation can be considered as a macroscopic analog of the dynamic Casimir effect, where fluxon pairs mimic the photons and the ac magnetic field plays the role of the oscillating mirrors. The emerging vortex pairs in our system can be detected by the pronounced features in the measured voltage characteristics, or through the emitted electromagnetic radiation, and exhibit resonant dynamics with respect to the frequency of the applied magnetic field. Reported tunability of the Josephson oscillations can be useful for developing high-frequency emission devices.
Description: This article was published in the journal, Physical Review B [© The American Physical Society].
Sponsor: This work was supported by the Flemish Science Foundation (FWO-Vl) and the Leverhulme Trust. G.R.B. acknowledges support from a EU-Marie Curie individual grant (Grant No. 253057)
Version: Published
DOI: 10.1103/PhysRevB.90.134505
URI: https://dspace.lboro.ac.uk/2134/18511
Publisher Link: http://dx.doi.org/10.1103/PhysRevB.90.134505
ISSN: 1098-0121
Appears in Collections:Published Articles (Physics)

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