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Stochastic resonance and scale invariance in nonequilibrium metastable states

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  • P. I. Hurtado
  • J. Marro
  • P. L. Garrido

Abstract

Using computer simulations, we study metastability in a two-dimensional Ising ferromagnet relaxing toward a nonequilibrium steady state. The interplay between thermal and nonequilibrium fluctuations induces resonant and scale-invariant phenomena not observed in equilibrium. In particular, we measure noise-enhanced stability of the metastable state in a nonequilibrium environment. The limit of metastability, or pseudospinodal separating the metastable regime from the unstable one, exhibits reentrant behavior as a function of temperature for strong nonequilibrium conditions. Furthermore, when subject to both open boundaries and nonequilibrium fluctuations, the metastable system decays via well-defined avalanches. These exhibit power-law size and lifetime distributions, resembling the scale-free avalanche dynamics observed in real magnets and other complex systems. We expect some of these results to be verifiable in actual (impure) specimens. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Suggested Citation

  • P. I. Hurtado & J. Marro & P. L. Garrido, 2006. "Stochastic resonance and scale invariance in nonequilibrium metastable states," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 49(1), pages 103-108, January.
    • Handle: RePEc:spr:eurphb:v:49:y:2006:i:1:p:103-108
    DOI: 10.1140/epjb/e2006-00029-9
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