Monte-Carlo simulations of the smeared phase transition in a contact process with extended defects

Details Monte-Carlo simulations of the smeared phase transition in a contact process with extended defects Monte-Carlo simulations of the smeared phase transition in a contact process with extended defects

2004-10-25

arxiv.org/abs/cond-mat/0410626v2

J. Phys. A 38 (2005) 1199-1208

Physics

Condensed Matter

Statistical Mechanics

10 pages, 7 eps figures, final version as published

Scientific paper

10.1088/0305-4470/38/6/001

We study the nonequilibrium phase transition in a contact process with extended quenched defects by means of Monte-Carlo simulations. We find that the spatial disorder correlations dramatically increase the effects of the impurities. As a result, the sharp phase transition is completely destroyed by smearing. This is caused by effects similar to but stronger than the usual Griffiths phenomena, viz., rare strongly coupled spatial regions can undergo the phase transition independently from the bulk system. We determine both the stationary density in the vicinity of the smeared transition and its time evolution, and we compare the simulation results to a recent theory based on extremal statistics.

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