Nonequilibrium wetting transition in a nonthermal 2D Ising model
VITO, Flemish Institute for Technological Research, 2400 Mol, Belgium
2 Department WNI, Hasselt University, 3590 Diepenbeek, Belgium
3 Institute for Theoretical Physics, Katholieke Universiteit Leuven, 3001 Leuven, Belgium
Corresponding author: a email@example.com
Published online: 11 May 2011
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 Ec. 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.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2011