arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.01639cond-mat.mes-hallcond-mat.quant-gascond-mat.str-el
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(2+1)维玻色拓扑绝缘体的可解晶格模型

Solvable lattice model for (2+1)D bosonic topological insulator

Yusuke Horinouchi

摘要:

本文构造了(2+1)D玻色拓扑绝缘体的一个精确可解的可交换投影哈密顿量,该拓扑绝缘体是受U(1)和时间反演$\mathbb{Z}_2^T$对称性保护的保序拓扑(SPT)相,对称群为U(1)$\rtimes\mathbb{Z}_2^T$ .该模型的构建是基于装饰域壁解释的$E_{\infty}$ -页的光谱序列的cobordism组分类的SPT阶段的问题。我们证明了非平凡的模型显示的Kramers双峰的出现时,系统被放在一个半无限的圆柱$(-\infty,0]\times S^1$插入$π$通量。表面异常表现为U(1)$\rtimes\mathbb{Z}_2^T$对称性的非现场表示。在一个简单的边界理论内讨论边界上的异常匹配。

英文摘要:

We construct an exactly sovable commuting projector Hamiltonian for (2+1)D bosonic topological insulator which is one of symmetry-protected topological (SPT) phases protected by U(1) and time-reversal $\mathbb{Z}_2^T$ symmetry, where the symmetry group is U(1)$\rtimes\mathbb{Z}_2^T$. The model construction is based on the decorated domain-wall interpretation of the $E_{\infty}$-page of a spectral sequence of a cobordism group that classifies the SPT phases in question. We demonstrate nontriviality of the model by showing an emergence of a Kramers doublet when the system is put on a semi-infinite cylinder $(-\infty,0]\times S^1$ with an inserted $π$-flux. The surface anomaly manifests itself as a non-onsite representation of the U(1)$\rtimes\mathbb{Z}_2^T$ symmetry. Anomaly matching on a boundary is discussed within a simple boundary theory.

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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