Quadratic contact process: phase separation with interface-orientation-dependent equistability.
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.
Liu
Da-Jiang
DJ
Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011-3020, USA.
Guo
Xiaofang
X
Evans
J W
JW