Phase diagram of a generalized ABC model on the interval

Details Phase diagram of a generalized ABC model on the interval Phase diagram of a generalized ABC model on the interval

2011-06-10

arxiv.org/abs/1106.1942v2

Physics

Condensed Matter

Statistical Mechanics

25 pages, 6 figures

Scientific paper

10.1007/s10955-011-0279-7

We study the equilibrium phase diagram of a generalized ABC model on an interval of the one-dimensional lattice: each site $i=1,...,N$ is occupied by a particle of type $\a=A,B,C,$ with the average density of each particle species $N_\a/N=r_\a$ fixed. These particles interact via a mean field non-reflection-symmetric pair interaction. The interaction need not be invariant under cyclic permutation of the particle species as in the standard ABC model studied earlier. We prove in some cases and conjecture in others that the scaled infinite system $N\rw\infty$, $i/N\rw x\in[0,1]$ has a unique density profile $\p_\a(x)$ except for some special values of the $r_\a$ for which the system undergoes a second order phase transition from a uniform to a nonuniform periodic profile at a critical temperature $T_c=3\sqrt{r_A r_B r_C}/2\pi$.

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