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arXiv 1301.0941cond-mat.stat-mechcond-mat.str-el
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空间各向异性阻挫伊辛模型中的拓扑浮相

Topological floating phase in a spatially anisotropic frustrated Ising model

A. Kalz, G. Chitov

摘要:

我们提出了新的结果的有序化过程的二维伊辛模型与各向异性挫败次近邻相互作用。我们集中在一个特定的宽的温度和参数区域,以确认两个特定阶段的模型的存在。第一阶段是一个不相称的代数有序(浮动)相出现在从顺磁高温相的过渡。然后,该模型经历了一个反铁磁有序的第二相与对角铁磁条(有序波矢量$\vec q = (π/2, π/2)$)的过渡。我们分析了几个观测量中出现的非常规特征,例如,能量,结构因素,和相关函数的广泛的蒙特卡罗模拟,并仔细检查晶格尺寸的影响。对于中间相的分析研究,Villain-Bak理论适用于本模型。结合数值和分析工作,我们提出了定量的相图模型,特别是,主张在中间拓扑浮动相。

英文摘要:

We present new results for the ordering process of a two-dimensional Ising model with anisotropic frustrating next-nearest-neighbor interactions. We concentrate on a specific wide temperature and parameter region to confirm the existence of two particular phases of the model. The first phase is an incommensurate algebraically-ordered (floating) phase emerging at the transition from the paramagnetic high-temperature phase. Then the model undergoes a transition to an antiferromagnetically ordered second phase with diagonal ferromagnetic stripes (ordering wave vector $\vec q = (π/2, π/2)$). We analyze the unconventional features appearing in several observables, e.g., energy, structure factors, and correlation functions by means of extensive Monte-Carlo simulations and examine carefully the influence of the lattice sizes. For the analytical study of the intermediate phase the Villain-Bak theory is adapted for the present model. Combining both the numerical and analytical work we present the quantitative phase diagram of the model, and, in particular, argue in favor of an intermediate topological floating phase.

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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