arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1607.06504cond-mat.str-elhep-th
收藏

(1+1)维玻色保序拓扑相的矩阵乘积态和等变拓扑场论

Matrix product states and equivariant topological field theories for bosonic symmetry-protected topological phases in (1+1) dimensions

Ken Shiozaki, Shinsei Ryu

摘要:

矩阵乘积态(MPSs)为研究一维晶格中的带隙量子相--特别是带隙拓扑相(SPT)提供了一个强有力的框架。另一方面,自然地期望在零相关长度的极限中的带隙量子相位由拓扑量子场论(TFT或TQFT)描述。在本文中,(1+1)维玻色子SPT相位保护的对称性$G$,我们桥接他们的描述MPS方面,和那些在$G$ -等变TFT。特别是,对于以前使用MPS构建的各种拓扑不变量(SPT不变量),我们从(1+1)TFT的角度提供推导。我们还讨论了边界自由度之间的连接,这出现在一个引入物理边界的SPT阶段,和“开放”的TFT,这是定义在时空与边界的TFT。

英文摘要:

Matrix Product States (MPSs) provide a powerful framework to study and classify gapped quantum phases --symmetry-protected topological (SPT) phases in particular--defined in one dimensional lattices. On the other hand, it is natural to expect that gapped quantum phases in the limit of zero correlation length are described by topological quantum field theories (TFTs or TQFTs). In this paper, for (1+1)-dimensional bosonic SPT phases protected by symmetry $G$, we bridge their descriptions in terms of MPSs, and those in terms of $G$-equivariant TFTs. In particular, for various topological invariants (SPT invariants) constructed previously using MPSs, we provide derivations from the point of view of (1+1) TFTs. We also discuss the connection between boundary degrees of freedom, which appear when one introduces a physical boundary in SPT phases, and "open" TFTs, which are TFTs defined on spacetimes with boundaries.

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。

↑