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Stochastic resonance in a locally excited system of bistable oscillators

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Abstract.

Stochastic resonance is studied in a one-dimensional array of overdamped bistable oscillators in the presence of a local subthreshold periodic perturbation. The system can be treated as an ensemble of pseudospins tending to align parallel which are driven dynamically by an external periodic magnetic field. The oscillators are subjected to a dynamic white noise as well as to a static topological disorder. The latter is quantified by the fraction of randomly added long-range connections among ensemble elements. In the low connectivity regime the system displays an optimal global stochastic resonance response if a small-world network is formed. In the mean-field regime we explain strong changes in the dynamic disorder strength provoking a maximal stochastic resonance response via the variation of fraction of long-range connections by taking into account the ferromagnetic-paramagnetic phase transition of the pseudospins. The system size analysis shows only quantitative power-law type changes on increasing number of pseudospins.

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Authors and Affiliations

  1. Departement of Physics, Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška cesta 160, 2000, Maribor, Slovenia

    M. Gosak, M. Perc & S. Kralj

  2. Jožef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia

    S. Kralj

Authors
  1. M. Gosak
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  2. M. Perc
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  3. S. Kralj
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Correspondence to M. Gosak.

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Gosak, M., Perc, M. & Kralj, S. Stochastic resonance in a locally excited system of bistable oscillators. Eur. Phys. J. B 80, 519–528 (2011). https://doi.org/10.1140/epjb/e2011-10573-8

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  • DOI: https://doi.org/10.1140/epjb/e2011-10573-8

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