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arXiv 1902.09901cond-mat.stat-mechhep-th
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耦合向量伊辛系统的临界点。精确结果

Critical points of coupled vector-Ising systems. Exact results

Gesualdo Delfino, Noel Lamsen

摘要:

我们表明,尺度不变散射理论允许精确地确定耦合$O(N)$和伊辛阶参数的二维系统的临界点。计算结果是针对$N$连续的,包括回路气体类型的临界性。特别地,对于$N=1$,我们展示了三条临界线相交于高斯模型的Berezinskiii-Kosterlitz-无边界过渡点,并与各向同性Ashkin-Teller模型的$Z_4$对称性相关。对于$N=2$,我们对XY-伊辛模型中可能出现的临界点进行了分类,并给出了完全受挫XY模型的临界指数的精确答案.

英文摘要:

We show that scale invariant scattering theory allows to exactly determine the critical points of two-dimensional systems with coupled $O(N)$ and Ising order pameters. The results are obtained for $N$ continuous and include criticality of loop gas type. In particular, for $N=1$ we exhibit three critical lines intersecting at the Berezinskii-Kosterlitz-Thouless transition point of the Gaussian model and related to the $Z_4$ symmetry of the isotropic Ashkin-Teller model. For $N=2$ we classify the critical points that can arise in the XY-Ising model and provide exact answers about the critical exponents of the fully frustrated XY model.

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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