Nonequilibrium wetting transition in a nonthermal 2D Ising model

Details Nonequilibrium wetting transition in a nonthermal 2D Ising model Nonequilibrium wetting transition in a nonthermal 2D Ising model

2011-01-28

arxiv.org/abs/1101.5530v1

Physics

Condensed Matter

Statistical Mechanics

12 pages, 12 figures

Scientific paper

Nonequilibrium wetting transitions are observed in Monte Carlo simulations of a kinetic spin system in the absence of a detailed balance condition with respect to an energy functional. A nonthermal model is proposed starting from a two-dimensional Ising spin lattice at zero temperature with two boundaries subject to opposing surface fields. Local spin excitations are only allowed by absorbing an energy quantum (photon) below a cutoff energy E_c. Local spin relaxation takes place by emitting a photon which leaves the lattice. Using Monte Carlo simulation nonequilibrium critical wetting transitions are observed as well as nonequilibrium first-order wetting phenomena, respectively in the absence or presence of absorbing states of the spin system. The transitions are identified from the behavior of the probability distribution of a suitably chosen order parameter that was proven useful for studying wetting in the (thermal) Ising model.

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