title: Phase transitions and steady-state microstructures in a two-temperature lattice-gas model with mobile active impurities
abstract: The nonequilibrium, steady-state phase transitions and the structure of the different phases of a two-dimensional system with two thermodynamic temperatures are studied via a simple lattice-gas model with mobile active impurities ("hot/cold spots") whose activity is controlled by an external drive. The properties of the model are calculated by Monte Carlo computer-simulation techniques. The two temperatures and the external drive on the system lead to a rich phase diagram including regions of microstructured phases in addition to macroscopically ordered (phase-separated) and disordered phases. Depending on the temperatures, microstructured phases of both lamellar and droplet symmetry arise, described by a length scale that is determined by the characteristic temperature controlling the diffusive motion of the active impurities.
authors: MEMPHYS, Department of Chemistry, Technical University of Denmark, Building 206, DK-2800 Lyngby, Denmark.
authors: JR
authors: Henriksen
authors: MC
authors: Sabra
authors: OG
authors: Mouritsen