We study the effects of quenched extended impurities on nonequilibrium phase transitions in the directed percolation universality class. We show that these impurities have a dramatic effect: they completely destroy the sharp phase transition by smearing. This is caused by rare strongly coupled spatial regions which can undergo the phase transition independently from the bulk system. We use extremal statistics to determine the stationary state as well as the dynamics in the tail of the smeared transition, and we illustrate the results by computer simulations.
T. Vojta, "Broadening of a Nonequilibrium Phase Transition by Extended Structural Defects," Physical Review E, American Physical Society (APS), Aug 2004.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevE.70.026108
National Science Foundation (U.S.)
University of Missouri Research Board
Keywords and Phrases
Computer Simulation; Hamiltonians; Grain Boundaries; Nonequilibrium Phase Transitions; Quenching
Article - Journal
© 2004 American Physical Society (APS), All rights reserved.