Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2006-04-24
Phys. Rev. E 74, 050101 (2006)
Physics
Condensed Matter
Statistical Mechanics
4 pages, 4 figs, published version
Scientific paper
10.1103/PhysRevE.74.050101
We study metastability and nucleation in a kinetic two-dimensional Ising model which is driven out of equilibrium by a small random perturbation of the usual dynamics at temperature T. We show that, at a mesoscopic/cluster level, a nonequilibrium potential describes in a simple way metastable states and their decay. We thus predict noise-enhanced stability of the metastable phase and resonant propagation of domain walls at low T. This follows from the nonlinear interplay between thermal and nonequilibrium fluctuations, which induces reentrant behavior of the surface tension as a function of T. Our results, which are confirmed by Monte Carlo simulations, can be also understood in terms of a Langevin equation with competing additive and multiplicative noises.
Garrido Pedro L.
Hurtado Pablo I.
Marro Joaquin
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