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arXiv 2212.09754cond-mat.str-elhep-thquant-ph
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三维拓扑序的边界态与解禁闭量子临界点

Boundary states of Three Dimensional Topological Order and the Deconfined Quantum Critical Point

Wenjie Ji, Nathanan Tantivasadakarn, Cenke Xu

AI总结:

本文研究三维 $\mathbb{Z}_2$ toric code 的三类边界态,揭示相图中带易轴各向异性的 DQCP、源于体表面缺陷的涌现 $\mathbb{Z}_{2,\text{d}}$ 对称性,并发现对称不变的有能隙表面拓扑序边界。

摘要:

我们研究典型三维拓扑序(即三维 $\mathbb{Z}_2$ toric code)的边界态。本文考虑三种不同的基本边界态类型。在包含这三种基本边界的相图中,可能存在一个多临界点,它由具有“易轴”各向异性的所谓解禁闭量子临界点(DQCP)描述。此外,还存在一个涌现的 $\mathbb{Z}_{2,\text{d}}$ 对称性,它会交换其中两种边界类型,并成为 DQCP 全局对称性的一部分。边界上的涌现 $\mathbb{Z}_{2,\text{d}}$ 对称性源于体相中的一类表面缺陷。我们进一步发现了一种带有表面拓扑序的有能隙边界,该边界在涌现对称性下保持不变。

英文摘要:

We study the boundary states of the archetypal three-dimensional topological order, i.e. the three-dimensional $\mathbb{Z}_2$ toric code. There are three distinct elementary types of boundary states that we will consider in this work. In the phase diagram that includes the three elementary boundaries there may exist a multi-critical point, which is captured by the so-called deconfined quantum critical point (DQCP) with an "easy-axis" anisotropy. Moreover, there is an emergent $\mathbb{Z}_{2,\text{d}}$ symmetry that swaps two of the boundary types, and it becomes part of the global symmetry of the DQCP. The emergent $\mathbb{Z}_{2,\text{d}}$ symmetry on the boundary is originated from a type of surface defect in the bulk. We further find a gapped boundary with a surface topological order that is invariant under the emergent symmetry.

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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