arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1705.04786hep-thcond-mat.str-el
收藏

Abel Higgs模型与持久序的评述

Comments on Abelian Higgs Models and Persistent Order

Zohar Komargodski, Adar Sharon, Ryan Thorngren, Xinan Zhou

摘要:

关于量子场论的一个自然问题是,是否存在对平凡的带隙相位的变形。如果基础理论有一个反常,那么对称形变永远不会导致平凡相。我们讨论了1+1维和2+1维阿贝尔希格斯模型中的这种离散异常。我们强调电荷共轭对称性在这些异常中的作用,例如,我们获得了非平凡的约束的自由度,生活在域壁的阿贝尔希格斯模型在2+1维的VBS阶段。此外,作为我们分析的副产品,我们表明,在1+1维的阿贝尔希格斯模型是对偶的伊辛模型。我们还研究了阿贝尔Higgs模型在1+1和2+1维中的变化,其中没有单位电荷的动力学粒子。这些模型具有中心对称性和额外的离散异常。在缺少动力学单位电荷粒子的情况下,取消了1+1维阿贝尔Higgs模型中的伊辛跃迁.这些模型没有一个单位电荷粒子表现出显着持久的秩序:我们证明了系统不能被无序的量子或热波动。等价地,当这些理论在一个圆上研究时,无论这个圆有多大或多小,基态都是非平凡的。

英文摘要:

A natural question about Quantum Field Theory is whether there is a deformation to a trivial gapped phase. If the underlying theory has an anomaly, then symmetric deformations can never lead to a trivial phase. We discuss such discrete anomalies in Abelian Higgs models in 1+1 and 2+1 dimensions. We emphasize the role of charge conjugation symmetry in these anomalies; for example, we obtain nontrivial constraints on the degrees of freedom that live on a domain wall in the VBS phase of the Abelian Higgs model in 2+1 dimensions. In addition, as a byproduct of our analysis, we show that in 1+1 dimensions the Abelian Higgs model is dual to the Ising model. We also study variations of the Abelian Higgs model in 1+1 and 2+1 dimensions where there is no dynamical particle of unit charge. These models have a center symmetry and additional discrete anomalies. In the absence of a dynamical unit charge particle, the Ising transition in the 1+1 dimensional Abelian Higgs model is removed. These models without a unit charge particle exhibit a remarkably persistent order: we prove that the system cannot be disordered by either quantum or thermal fluctuations. Equivalently, when these theories are studied on a circle, no matter how small or large the circle is, the ground state is non-trivial.

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。

↑