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

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

2003-07-23

arxiv.org/abs/cond-mat/0307595v2

Phys. Rev. Lett. 92, 015701 (2004).

Physics

Condensed Matter

Statistical Mechanics

4 pages RevTex4, 2 figures. Phys. Rev. Lett., in press

Scientific paper

10.1103/PhysRevLett.92.015701

We study low-temperature nucleation in kinetic Ising models by analytical and simulational methods, confirming the general result for the average metastable lifetime, = 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.

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