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arXiv 2209.00670cond-mat.str-elhep-th
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任意维非受限量子临界性的非线性西格玛模型描述

Nonlinear sigma model description of deconfined quantum criticality in arbitrary dimensions

Da-Chuan Lu

摘要:

在本文中,我们提出使用非线性西格玛模型(NLSM)与Wess-Zumino-Witten(WZW)项作为一个一般性的描述解除限制的量子临界点,分离两个自发破缺(SSB)相在任意尺寸。特别地,我们讨论了NLSM的目标空间的适当选择,它通常是齐次空间$G/K$,其中$G$是UV对称性,$K$是由$\mathfrak{k}=\mathfrak{h}_1\cap \mathfrak{h}_2$生成的,而$\mathfrak{h}_i$是每个SSB相位中不破缺对称性的李代数。有了这个特定的目标空间,对称性缺陷在两个SSB阶段是平等的基础上,和他们的纠缠被捕获的WZW项。然后通过扩散对称缺陷来调谐DQCP转变。通过将带有WZW项的$G/K$ NLSM耦合到背景规范场,可以确定该理论的t Hooft反常。取消异常的批量安全保护拓扑(SPT)相描述的相对陈-西蒙斯项。构造并讨论了3+ 1维空间中一系列具有格拉斯曼对称性缺陷的模型.我们还提供了费米子模型,再现$G/K$ NLSM与WZW项。

英文摘要:

In this paper, we propose using the nonlinear sigma model (NLSM) with the Wess-Zumino-Witten (WZW) term as a general description of deconfined quantum critical points that separate two spontaneously symmetry-breaking (SSB) phases in arbitrary dimensions. In particular, we discuss the suitable choice of the target space of the NLSM, which is in general the homogeneous space $G/K$, where $G$ is the UV symmetry and $K$ is generated by $\mathfrak{k}=\mathfrak{h}_1\cap \mathfrak{h}_2$, and $\mathfrak{h}_i$ is the Lie algebra of the unbroken symmetry in each SSB phase. With this specific target space, the symmetry defects in both SSB phases are on equal footing, and their intertwinement is captured by the WZW term. The DQCP transition is then tuned by proliferating the symmetry defects. By coupling the $G/K$ NLSM with the WZW term to the background gauge field, the 't Hooft anomaly of this theory can be determined. The bulk symmetry-protected topological (SPT) phase that cancels the anomaly is described by the relative Chern-Simons term. We construct and discuss a series of models with Grassmannian symmetry defects in 3+1d. We also provide the fermionic model that reproduces the $G/K$ NLSM with the WZW term.

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