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Partially asymmetric exclusion processes with sitewise disorder.

作者信息

Juhász Róbert, Santen Ludger, Iglói Ferenc

机构信息

Fachrichtung Theoretische Physik, Universität des Saarlandes, D-66041 Saarbrücken, Germany.

出版信息

Phys Rev E Stat Nonlin Soft Matter Phys. 2006 Dec;74(6 Pt 1):061101. doi: 10.1103/PhysRevE.74.061101. Epub 2006 Dec 4.

Abstract

We study the stationary properties as well as the nonstationary dynamics of the one-dimensional partially asymmetric exclusion process with position-dependent random hop rates. Relating the hop rates to an energy landscape the stationary current J is determined by the largest barrier in a finite system of L sites and the corresponding waiting time tau approximately J{-1} is related to the waiting time of a single random walker, tau_{rw} , as tau approximately tau_{rw}{1/2} . The current is found to vanish as J approximately L{-z2} , where z is the dynamical exponent of the biased single-particle Sinai walk. Typical stationary states are phase separated: At the largest barrier almost all particles queue at one side and almost all holes are at the other side. The high-density (low-density) region is divided into approximately L{1/2} connected parts of particles (holes) which are separated by islands of holes (particles) located at the subleading barriers (valleys). We also study nonstationary processes of the system, like coarsening and invasion. Finally we discuss some related models, where particles of larger size or multiple occupation of lattice sites is considered.

摘要

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