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arXiv 2403.18372cond-mat.mes-hall
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PT和PC对称拓扑绝缘体与超导体中的体-纠缠谱对应关系

Bulk-entanglement spectrum correspondence in $PT$- and $PC$-symmetric topological insulators and superconductors

Ryo Takahashi, Tomoki Ozawa

AI总结:

本文提出PT和PC对称拓扑绝缘体与超导体中边缘谱通常有能隙,传统体-边界对应失效,并证明此时单粒子纠缠谱无能隙,建立体-纠缠谱对应关系,给出各对称类具体模型。

摘要:

在本研究中,我们讨论了一种新型的体-边界对应关系,该关系在拓扑绝缘体和超导体中当宇称-时间(PT)和/或宇称-粒子-空穴(PC)对称性存在时成立。在这些系统中,即使体拓扑是非平凡的,边缘谱通常也是有能隙的,因此传统的体-边界对应关系并不成立。我们发现,当体拓扑非平凡时,替代边缘谱,单粒子纠缠谱变为无能隙:即体-纠缠谱对应关系在PT和/或PC对称的拓扑绝缘体和超导体中成立。在使用K理论方法展示该对应关系之后,我们为每个对称类提供了最高三维的具体模型,在这些模型中预期会出现由PT和/或PC导致的非平凡拓扑。我们结果的一个推论是,当PT和/或PC对称性下的体拓扑非平凡时,非相互作用多体纠缠谱在一维中是多重简并的,在二维或更高维度中是无能隙的。

英文摘要:

In this study, we discuss a new type of bulk-boundary correspondence which holds for topological insulators and superconductors when the parity-time ($PT$) and/or parity-particle-hole ($PC$) symmetry are present. In these systems, even when the bulk topology is nontrivial, the edge spectrum is generally gapped, and thus the conventional bulk-boundary correspondence does not hold. We find that, instead of the edge spectrum, the single-particle entanglement spectrum becomes gapless when the bulk topology is nontrivial: i.e., the $\textit{bulk-entanglement}$ $\textit{spectrum}$ $\textit{correspondence}$ holds in $PT$- and/or $PC$-symmetric topological insulators and superconductors. After showing the correspondence using $K$-theoretic approach, we provide concrete models for each symmetry class up to three dimensions where nontrivial topology due to $PT$ and/or $PC$ is expected. An implication of our results is that, when the bulk topology under $PT$ and/or $PC$ symmetry is nontrivial, the non-interacting many-body entanglement spectrum is multiply degenerate in one dimension and is gapless in two or higher dimensions.

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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