Low-temperature nucleation in a kinetic Ising model with soft stochastic dynamics

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We study low-temperature nucleation in kinetic Ising models by analytical and simulational methods, confirming the general result for the average metastable lifetime, <tau> = A*exp(beta*Gamma) (beta = 1/kT) [E. Jordao Neves and R.H. Schonmann, Commun. Math. Phys. 137, 209 (1991)]. Contrary to common belief, we find that both A and Gamma depend significantly on the stochastic dynamic. In particular, for a ``soft'' dynamic, in which the effects of the interactions and the applied field factorize in the transition rates, Gamma does NOT simply equal the energy barrier against nucleation, as it does for the standard Glauber dynamic, which does not have this factorization property.
4 pages RevTex4, 2 figures. Phys. Rev. Lett., in press

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Statistical Mechanics, Materials Science

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http://salesiana.dossiersoluciones.com/handle/123456789/21885

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0307595
 http://arxiv.org/abs/cond-mat/0307595
 Phys. Rev. Lett. 92, 015701 (2004).
 doi:10.1103/PhysRevLett.92.015701

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