Phase Transition in the ABC Model

Details Phase Transition in the ABC Model Phase Transition in the ABC Model

2002-09-30

arxiv.org/abs/cond-mat/0209674v2

Phys. Rev. E 67, 066115 (2003)

Physics

Condensed Matter

Statistical Mechanics

18 pages, 3 figures

Scientific paper

10.1103/PhysRevE.67.066115

Recent studies have shown that one-dimensional driven systems can exhibit phase separation even if the dynamics is governed by local rules. The ABC model, which comprises three particle species that diffuse asymmetrically around a ring, shows anomalous coarsening into a phase separated steady state. In the limiting case in which the dynamics is symmetric and the parameter $q$ describing the asymmetry tends to one, no phase separation occurs and the steady state of the system is disordered. In the present work we consider the weak asymmetry regime $q=\exp{(-\beta/N)}$ where $N$ is the system size and study how the disordered state is approached. In the case of equal densities, we find that the system exhibits a second order phase transition at some nonzero $\beta_c$. The value of $\beta_c = 2 \pi \sqrt{3}$ and the optimal profiles can be obtained by writing the exact large deviation functional. For nonequal densities, we write down mean field equations and analyze some of their predictions.

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