Potts model with $q=4,6,$ and 8 states on Voronoi-Delaunay random lattice

Details Potts model with $q=4,6,$ and 8 states on Voronoi-Delaunay random lattice Potts model with $q=4,6,$ and 8 states on Voronoi-Delaunay random lattice

2010-01-12

arxiv.org/abs/1001.1848v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

17 pages, 9 figures

Scientific paper

Through Monte Carlo simulations we study two-dimensional Potts models with $q=4, 6$ and 8 states on Voronoi-Delaunay random lattice. In this study, we assume that the coupling factor $J$ varies with the distance $r$ between the first neighbors as $J(r)\propto e^{-a r}$, with $a \geq 0$ . The disordered system is simulated applying the singler-cluster Monte Carlo update algorithm and reweigting technique. In this model both second-order and first-order phase transition are present depending of $q$ values and $a$ parameter. The critical exponents ratio $\beta/\nu$, $\gamma/\nu$, and $1/\nu$ were calculated for case where the second-order phase transition are present. In the Potts model with $q=8$ we also studied the distribution of clusters sizes.

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