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arXiv 2501.03314cond-mat.str-elhep-thmath.QAquant-ph
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拓扑有序的软对称性

Soft symmetries of topological orders

School of Natural Sciences, Institute for Advanced Study(普林斯顿高等研究院自然科学学院);Department of Physics and Joint Quantum Institute, University of Maryland(马里兰大学物理系与联合量子研究所)

Ryohei Kobayashi, Maissam Barkeshli

AI总结:

本文研究了(2+1)D拓扑有序中由模张量范畴C的辫状张量自等价构成的Aut(C)对称性,探讨了其中非平凡的软对称性现象及其在高维理论中的应用。

摘要:

(2+1)D拓扑有序具有由模张量范畴C的辫状张量自等价构成的Emergent对称性Aut(C)。本文讨论了Aut(C)中既不置换任何子结构也不与任何对称性分数化相关但仍是非平凡的元素,即软对称性。指出可通过装饰特定类的加权SPT态来构造对应于此类奇异对称作用的拓扑缺陷。这为Davydov关于软辫状张量自等价的工作提供了物理解释,并对间隙边界分类、非可逆自发对称破缺及拓扑物质的对称富集相分类有重要影响。还展示了在更高维度中的类似现象,如(3+1)D具有四元群Q_8作为规范群的规范理论。

英文摘要:

(2+1)D topological orders possess emergent symmetries given by a group $\text{Aut}(\mathcal{C})$, which consists of the braided tensor autoequivalences of the modular tensor category $\mathcal{C}$ that describes the anyons. In this paper we discuss cases where $\text{Aut}(\mathcal{C})$ has elements that neither permute anyons nor are associated to any symmetry fractionalization but are still non-trivial, which we refer to as soft symmetries. We point out that one can construct topological defects corresponding to such exotic symmetry actions by decorating with a certain class of gauged SPT states that cannot be distinguished by their torus partition function. This gives a physical interpretation to work by Davydov on soft braided tensor autoequivalences. This has a number of important implications for the classification of gapped boundaries, non-invertible spontaneous symmetry breaking, and the general classification of symmetry-enriched topological phases of matter. We also demonstrate analogous phenomena in higher dimensions, such as (3+1)D gauge theory with gauge group given by the quaternion group $Q_8$.

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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