title: Rhombic patterns: Broken hexagonal symmetry.
abstract: Landau-Ginzburg equations derived to conserve two-dimensional spatial symmetries lead to the prediction that rhombic arrays with characteristic angles slightly differ from 60 degrees should form in many systems. Beyond the bifurcation from the uniform state to patterns, rhombic patterns are linearly stable for a band of angles near the 60 degrees angle of regular hexagons. Experiments conducted on a reaction-diffusion system involving a chlorite-iodide-malonic acid reaction yield rhombic patterns in good accord with the theory.
authors.affiliation: Center for Nonlinear Dynamics and Department of Physics, The University of Texas, Austin, Texas 78712Department of Physics, The University of Houston, Houston, Texas 77204Center for Nonlinear Dynamics and Department of Physics, The University of Texas, Austin, Texas 78712.
authors.forename: Qi
authors.initials: Q
authors.lastname: Ouyang
authors.forename: Gemunu H.
authors.initials: GH
authors.lastname: Gunaratne
authors.forename: Harry L.
authors.initials: HL
authors.lastname: Swinney