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arXiv 1209.2265cond-mat.stat-mechcond-mat.str-el
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正方格子上阻挫伊辛模型中Potts临界端点的位置

Location of the Potts-critical end point in the frustrated Ising model on the square lattice

A. Kalz, A. Honecker

摘要:

本文报道了二维正方格子上的$J_1$伊辛模型的蒙特卡罗模拟。最近的分析表明,对于从顺磁状态到反铁磁共线状态的相变,根据阻挫$J_2 / J_1$的值,应用不同的相变方案。特别是具有临界Ashkin-Teller样行为的区域,即,验证了具有不同临界指数的二阶相变和具有一阶指示的非临界区域。然而,两种情况之间的确切过渡点$[J_2/J_1]_C$仍在讨论中。在本文中,我们提出了Monte Carlo数据,加强了金\et [物理评论快报]的结论。\textbf{108},045702(2012)]中,转变点在$J_2/J_1 \approx 0.67$的值处,并且对于较大的$J_2/J_1$值,能量直方图中的双峰结构在标度分析中是不稳定的。

英文摘要:

We report on Monte Carlo simulations for the two-dimensional frustrated $J_1$-$J_2$ Ising model on the square lattice. Recent analysis has shown that for the phase transition from the paramagnetic state to the antiferromagnetic collinear state different phase-transition scenarios apply depending on the value of the frustration $J_2 / J_1$. In particular a region with critical Ashkin-Teller-like behavior, i.e., a second-order phase transition with varying critical exponents, and a noncritical region with first-order indications were verified. However, the exact transition point $[J_2/J_1]_C$ between both scenarios was under debate. In this paper we present Monte Carlo data which strengthens the conclusion of Jin \et [Phys. Rev. Lett. \textbf{108}, 045702 (2012)] that the transition point is at a value of $J_2/J_1 \approx 0.67$ and that double-peak structures in the energy histograms for larger values of $J_2/J_1$ are unstable in a scaling analysis.

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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