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arXiv 1209.0105cond-mat.stat-mech
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各向异性与普适性:二维伊辛模型的临界Binder累积量

Anisotropy and universality: Critical Binder cumulant of the two-dimensional Ising model

Boris Kastening

摘要:

我们重新分析了具有周期边界条件的正方形晶格上的各向异性二维伊辛模型的临界Binder累积量U* 的转移矩阵和Monte Carlo结果。自旋耦合最近的相邻站点之间和次最近的相邻站点之间沿晶格对角线之一。我们发现,U* 只依赖于各向异性的渐近临界长距离功能,无论其实现通过铁磁或反铁磁次近邻耦合。我们修改早期的重整化群计算,以获得定量描述的各向异性依赖的U*。我们的研究结果支持我们最近声称的有效性的普遍性的临界现象中存在的弱各向异性。

英文摘要:

We reanalyze transfer matrix and Monte Carlo results for the critical Binder cumulant U* of an anisotropic two-dimensional Ising model on a square lattice in a square geometry with periodic boundary conditions. Spins are coupled between nearest neighboring sites and between next-nearest neighboring sites along one of the lattice diagonals. We find that U* depends only on the asymptotic critical long-distance features of the anisotropy, irrespective of its realization through ferromagnetic or antiferromagnetic next-nearest neighbor couplings. We modify an earlier renormalization-group calculation to obtain a quantitative description of the anisotropy dependence of U*. Our results support our recent claim towards the validity of universality for critical phenomena in the presence of a weak anisotropy.

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