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arXiv 1508.04538cond-mat.stat-mech
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一类三维Potts模型的O(n)对称性

Emergent O(n) Symmetry in a series of three-dimensional Potts Models

Chengxiang Ding, Henk W. J. Bloete, Youjin Deng

摘要:

我们研究了简立方晶格上的q态Potts模型,其中一个晶格方向上存在铁磁相互作用,另外两个晶格方向上存在反铁磁相互作用。随着温度T的降低,系统经历二级相变,其符合3D O(n)模型的普适类,其中n=q-1。这一结论是基于估计的临界指数,和直方图的序参量。在更小的T,我们发现,对于q=4和5,一个一阶过渡到一个相位与不同类型的长程序。这种长程序在T=0时溶解,系统有效地还原为无序的二维Potts反铁磁体。这些结果是通过蒙特卡罗模拟和有限尺寸标度得到的。

英文摘要:

We study the q-state Potts model on the simple cubic lattice with ferromagnetic interactions in one lattice direction, and antiferromagnetic interactions in the two other directions. As the temperature T decreases, the system undergoes a second-order phase transition that fits in the universality class of the 3D O(n) model with n=q-1. This conclusion is based on the estimated critical exponents, and histograms of the order parameter. At even smaller T we find, for q=4 and 5, a first-order transition to a phase with a different type of long-range order. This long-range order dissolves at T=0, and the system effectively reduces to a disordered two-dimensional Potts antiferromagnet. These results are obtained by means of Monte Carlo simulations and finite-size scaling.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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