Abstract
We have investigated within the mean-field approximation the surface order parameter at nonequilibrium, critical wetting transitions of KPZ interfaces interacting with a wall. The model covers both positive and negative KPZ nonlinearities. Positive KPZ nonlinearities generate a trivial mean-field (or high-dimensional) behavior for nonequilibrium critical wetting which is analogous to the mean-field behavior of equilibrium critical wetting. On the contrary , negative KPZ nonlinearities behave in a rather intricate way, with highly nontrivial scaling including three different
regimes even in mean-field approximation. The analytical results are also verified by solving numerically the self-consistent equation in each case.
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