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arXiv 1012.1485cond-mat.stat-mech
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三维伊辛模型、渗流理论与共形不变性

Three Dimensional Ising Model, Percolation Theory and Conformal Invariance

Abbas Ali Saberi, Horr Dashti-Naserabadi

摘要:

用Monte Carlo方法研究了三维伊辛模型的二维切片的分形结构和标度性质。几何自旋(GS)团簇的渗流相变发生在居里点,反映了3d模型的临界行为。临界点处几何自旋团簇周长和外周长的分形维数和缠绕角统计表明,如果在标度极限内共形不变,它们可以分别用扩散系数为5和16/5的Schramm-Loewner演化理论(SLE_κ)描述,与二维三临界伊辛模型中的界面属于同一普适类.研究还发现,与截面相关联的Fortuin-Kasteleyn(FK)团簇经历了一个非平凡的渗流转变,其普适性与普通的二维临界渗流相同.

英文摘要:

The fractal structure and scaling properties of a 2d slice of the 3d Ising model is studied using Monte Carlo techniques. The percolation transition of geometric spin (GS) clusters is found to occur at the Curie point, reflecting the critical behavior of the 3d model. The fractal dimension and the winding angle statistics of the perimeter and external perimeter of the geometric spin clusters at the critical point suggest that, if conformally invariant in the scaling limit, they can be described by the theory of Schramm-Loewner evolution (SLE_κ) with diffusivity of κ=5 and 16/5, respectively, putting them in the same universality class as the interfaces in 2d tricritical Ising model. It is also found that the Fortuin-Kasteleyn (FK) clusters associated with the cross sections undergo a nontrivial percolation transition, in the same universality class as the ordinary 2d critical percolation.

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