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arXiv 0908.3622cond-mat.dis-nncond-mat.stat-mech
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金刚石等级晶格上的无序Potts模型:大q极限下的数值精确处理

Disordered Potts model on the diamond hierarchical lattice: Numerically exact treatment in the large-q limit

Ferenc Igloi, Loic Turban

摘要:

我们考虑了随机q态Potts模型在大q极限下的临界行为,其中不同类型的无序导致无阻随机铁磁区或阻挫自旋玻璃区.该模型是在钻石等级格上研究的,Migdal-Kadanoff实空间重整化是精确的。它被证明是有一个铁磁和顺磁相和相变是由四个不同的固定点控制。系统的状态由界面自由能P(I)的分布表征,其在不动点处满足不同的积分方程。通过数值积分,我们得到了非线性随机数组合的相应稳定律,并得到了临界指数的数值精确值。

英文摘要:

We consider the critical behavior of the random q-state Potts model in the large-q limit with different types of disorder leading to either the nonfrustrated random ferromagnet regime or the frustrated spin glass regime. The model is studied on the diamond hierarchical lattice for which the Migdal-Kadanoff real-space renormalization is exact. It is shown to have a ferromagnetic and a paramagnetic phase and the phase transition is controlled by four different fixed points. The state of the system is characterized by the distribution of the interface free energy P(I) which is shown to satisfy different integral equations at the fixed points. By numerical integration we have obtained the corresponding stable laws of nonlinear combination of random numbers and obtained numerically exact values for the critical exponents.

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