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arXiv 1108.2276cond-mat.stat-mech
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$p$ -时钟模型的对偶和phase diagram

Dualities and the phase diagram of the $p$-clock model

G. Ortiz, E. Cobanera, Z. Nussinov

摘要:

一种新的“键代数”对偶变换方法提供了一个非常强大的技术来分析经典的二维XY和$p$ -时钟模型中的元激发。通过结合对偶性和Peierls参数,我们建立了这些模型的非阿贝尔对称性,相结构和跃迁的存在性,揭示了它们的拓扑激发的性质,并明确表明当$p \geq 5$时出现连续的U(1)对称性。后一种对称性与离散涡和Berezinskiii-Kosterlitz-Thouless型转变的出现有关。我们推导出一个相关不等式,证明了出现在$p\geq 5$中的中间相是临界的(无质量),具有衰减的幂律相关性。

英文摘要:

A new "bond-algebraic" approach to duality transformations provides a very powerful technique to analyze elementary excitations in the classical two-dimensional XY and $p$-clock models. By combining duality and Peierls arguments, we establish the existence of non-Abelian symmetries, the phase structure, and transitions of these models, unveil the nature of their topological excitations, and explicitly show that a continuous U(1) symmetry emerges when $p \geq 5$. This latter symmetry is associated with the appearance of discrete vortices and Berezinskii-Kosterlitz-Thouless-type transitions. We derive a correlation inequality to prove that the intermediate phase, appearing for $p\geq 5$, is critical (massless) with decaying power-law correlations.

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