Cox, J.; Chesca, B.; John, D.; Savel’ev, S.; Mellor, C. Vortex ratchets based on asymmetric arrays of Josephson junctions. (English) Zbl 1457.82244 J. Stat. Mech. Theory Exp. 2019, No. 11, Article ID 114001, 10 p. (2019). Summary: Magnetic vortex-ratchet effects in various designs of asymmetric arrays of Josephson junctions (JJs) ratchets have been simulated numerically and measured experimentally. Asymmetry in the designs is achieved by spatial asymmetric variations of either the critical current \((j_c)\) of the JJ or the area \((A)\) of the superconducting loops in between the JJ or both. It was found that larger arrays result in larger ratchet efficiency and are less susceptible to noise fluctuations. The simulation results were compared with measurements of various designs of JJ arrays ratchets made of \(YBa_2 Cu_3O_{7- \delta }\) thin film superconductor and having either asymmetric or symmetric loop areas. We demonstrate that the ratchet efficiency can be very efficiently tuned by an applied magnetic field. Such vortex ratchets could be used as vortex diodes to pump out Josephson vortices from sensitive superconducting electronic or as sensitive magnetic sensors. Cited in 1 Document MSC: 82C22 Interacting particle systems in time-dependent statistical mechanics PDFBibTeX XMLCite \textit{J. Cox} et al., J. Stat. Mech. Theory Exp. 2019, No. 11, Article ID 114001, 10 p. (2019; Zbl 1457.82244) Full Text: DOI References: [1] Hänggi P and Marchesoni F 2009 Rev. Mod. Phys.81 387 · doi:10.1103/RevModPhys.81.387 [2] Tinkham M 2004 Introduction to Superconductivity 2nd revised edn (New York: Dover) [3] Lee C S, Janko B, Derenyi I and Barabasi A L 1999 Nature400 337 · doi:10.1038/22485 [4] Wambaugh J F, Reichhardt C, Olson C J, Marchesoni F and Nori F 1999 Phys. Rev. Lett.83 5106 · doi:10.1103/PhysRevLett.83.5106 [5] Olson C J, Reichhardt C, Janko B and Nori F 2001 Phys. Rev. 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