title: Anomalous roughness in dimer-type surface growth
abstract: We point out how geometric features affect the scaling properties of nonequilibrium dynamic processes, by a model for surface growth where particles can deposit and evaporate only in dimer form, but dissociate on the surface. Pinning valleys (hilltops) develop spontaneously and the surface facets for all growth (evaporation) biases. More intriguingly, the scaling properties of the rough one dimensional equilibrium surface are anomalous. Its width, W approximately Lalpha, diverges with system size L as alpha = 1 / 3 instead of the conventional universal value alpha = 1 / 2. This originates from a topological nonlocal evenness constraint on the surface configurations.
authors.affiliation: Department of Physics, University of Washington, Seattle, Washington 98195-1560 and Center for Theoretical Physics, Seoul National University, Seoul 151-742, Korea.
authors.initials: JD
authors.lastname: Noh
authors.initials: H
authors.lastname: Park
authors.lastname: den Nijs M