Stochastic resonance and scale invariance in nonequilibrium metastable states |
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Authors: | P I Hurtado J Marro P L Garrido |
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Institution: | 1. Department of Physics, Boston University, Boston, Massachusetts, 02215, USA 2. Laboratoire des Collo?des, Verres et Nanomatériaux, Université Montpellier II, Montpellier, 34095, France 3. Instituto “Carlos I" de Física Teórica y Computacional, and Depto. de Electromagnetismo y Física de la Materia, Universidad de Granada, 18071, Granada, Espana
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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. |
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