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Spontaneous symmetry breaking in a bridge model fed by junctions

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Vladislav Popkov1,2, Martin R Evans3 and David Mukamel4

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We introduce a class of 1D models mimicking a single-lane bridge with two junctions and two particle species driven in opposite directions. The model exhibits spontaneous symmetry breaking (SSB) for a range of injection/extraction rates. In this phase the steady-state currents of the two species are not equal. Moreover, there is a co-existence region in which the symmetry-broken phase co-exists with a symmetric phase. Along a path in which the extraction rate is varied, keeping the injection rate fixed and large, hysteresis takes place. The mean-field phase diagram is calculated and supporting Monte Carlo simulations are presented. One of the transition lines exhibits a kink, a feature which cannot exist in transition lines of equilibrium phase transitions.


PACS

05.70.Fh Phase transitions: general studies

05.10.Ln Monte Carlo methods

02.50.Cw Probability theory

05.70.Ln Nonequilibrium and irreversible thermodynamics

MSC

60G10 Stationary processes

82C26 Dynamic and nonequilibrium phase transitions (general)

82C80 Numerical methods (Monte Carlo, series resummation, etc.)

60Bxx Probability theory on algebraic and topological structures

Subjects

Computational physics

Statistical physics and nonlinear systems

Dates

Issue 43 (31 October 2008)

Received 29 July 2008, in final form 11 September 2008

Published 1 October 2008



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