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arXiv 1602.05936math.QAcond-mat.str-elmath.CT
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酉辫状融合范畴的模扩张与2+ 1维拓扑/SPT序

Modular extensions of unitary braided fusion categories and 2+1D topological/SPT orders with symmetries

Tian Lan, Liang Kong, Xiao-Gang Wen

摘要:

有限玻色子或费米子对称性可以用对称熔合范畴$\mathcal{E}$唯一地描述。在这项工作中,我们提出的2+ 1维拓扑/SPT订单与固定的有限对称性$\mathcal{E}$进行分类,直到$E_8$量子霍尔态,由酉模张量范畴$\mathcal{C}$在$\mathcal{E}$和每个$\mathcal{C}$的模块扩展。在$\mathcal{C}=\mathcal{E}$情形下,证明了$\mathcal{E}$的所有模扩张的集合$\mathcal{M}_{ext}(\mathcal{E})$具有有限阿贝尔群的自然结构.我们还证明了$\mathcal{C}$的所有模块化扩展的集合$\mathcal{M}_{ext}(\mathcal{C})$,如果不为空,则配备有一个自然的$\mathcal{M}_{ext}(\mathcal{E})$ -动作是自由的和传递的。即,集合$\mathcal{M}_{ext}(\mathcal{C})$是$\mathcal{M}_{ext}(\mathcal{E})$ -torsor。作为特殊情况,我们详细解释了$\mathcal{M}_{ext}(\mathcal{E})$群如何恢复2+1D玻色子SPT阶的著名群上同调分类和Kitaev的16倍方法。我们还简要地讨论了群$\mathcal{M}_{ext}(\mathcal{E})$在破缺过程下的行为及其与Witt群的关系。

英文摘要:

A finite bosonic or fermionic symmetry can be described uniquely by a symmetric fusion category $\mathcal{E}$. In this work, we propose that 2+1D topological/SPT orders with a fixed finite symmetry $\mathcal{E}$ are classified, up to $E_8$ quantum Hall states, by the unitary modular tensor categories $\mathcal{C}$ over $\mathcal{E}$ and the modular extensions of each $\mathcal{C}$. In the case $\mathcal{C}=\mathcal{E}$, we prove that the set $\mathcal{M}_{ext}(\mathcal{E})$ of all modular extensions of $\mathcal{E}$ has a natural structure of a finite abelian group. We also prove that the set $\mathcal{M}_{ext}(\mathcal{C})$ of all modular extensions of $\mathcal{C}$, if not empty, is equipped with a natural $\mathcal{M}_{ext}(\mathcal{E})$-action that is free and transitive. Namely, the set $\mathcal{M}_{ext}(\mathcal{C})$ is an $\mathcal{M}_{ext}(\mathcal{E})$-torsor. As special cases, we explain in details how the group $\mathcal{M}_{ext}(\mathcal{E})$ recovers the well-known group-cohomology classification of the 2+1D bosonic SPT orders and Kitaev's 16 fold ways. We also discuss briefly the behavior of the group $\mathcal{M}_{ext}(\mathcal{E})$ under the symmetry-breaking processes and its relation to Witt groups.

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