title: Quadratic contact process: phase separation with interface-orientation-dependent equistability.
abstract: The quadratic contact process is implemented on a square lattice as a model with random adsorption and correlated desorption requiring empty pairs of diagonal neighbors. The model exhibits a discontinuous phase transition between an active state and an absorbing state, but equistability between these states depends on the orientation of the separating interface. Correspondingly, for a generalized class of models, we find phase coexistence over a finite region of their two-dimensional parameter space. This is in stark contrast to behavior in equilibrium systems.
authors.affiliation: Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011-3020, USA.
authors.forename: Da-Jiang
authors.initials: DJ
authors.lastname: Liu
authors.forename: Xiaofang
authors.initials: X
authors.lastname: Guo
authors.forename: J W
authors.initials: JW
authors.lastname: Evans