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arXiv 1207.4430cond-mat.stat-mechcond-mat.dis-nn
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有向小世界网络上q=3和4态Potts模型

Potts model with q=3 and 4 states on directed Small-World network

P. R. O. da Silva, F. W. S. Lima, R. N. Costa Filho

摘要:

利用蒙特卡罗模拟研究了二维Potts模型在有向小世界网络上的q=3和q = 4的情况.应用热浴蒙特卡罗更新算法对无序系统进行了模拟。一阶和二阶相变被发现为q=3取决于重新布线的概率$p$,但对于q=4的系统仅呈现一阶相变的任何值$p$。这种临界行为不同于正方形晶格上的Potts模型,其中对于$q\le4$存在二级相变,并且对于q>4存在一级相变。

英文摘要:

Monte Carlo simulations are performed to study the two-dimensional Potts models with q=3 and 4 states on directed Small-World network. The disordered system is simulated applying the Heat bath Monte Carlo update algorithm. A first-order and second-order phase transition is found for q=3 depending on the rewiring probability $p$, but for q=4 the system presents only a first-order phase transition for any value $p$ . This critical behavior is different from the Potts model on a square lattice, where the second-order phase transition is present for $q\le4$ and a first-order phase transition is present for q>4.

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