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arXiv 1805.04531cond-mat.str-elquant-ph
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PEPS的$SU(2)$、点群和平移对称性的相互作用:手性自旋液体的应用

Interplay of $SU(2)$, point group and translation symmetry for PEPS: application to a chiral spin liquid

Anna Hackenbroich, Antoine Sterdyniak, Norbert Schuch

摘要:

投影纠缠对态(PEPS)提供了许多非手性拓扑有序态的精确表示,而它们对相互作用手性拓扑相的适用范围在很大程度上仍然没有解决。在这种情况下,局部PEPS张量的对称性对于确定状态的特征拓扑特征至关重要。在这篇文章中,我们研究了当不同的对称性同时施加在局部张量,如内部$SU(2)$,点群和平移对称性的约束。我们展示了这些对称性的相互作用如何体现在纠缠谱,这是手性拓扑顺序的主要诊断工具。我们将我们的结果应用到自旋液体PEPS作为共振价键态的手性推广。我们的研究结果解释了观察到的纠缠谱和预期的手征共形场论所描述的边缘谱之间的差异。最后,在一定的参数范围内,这个PEPS具有额外的$U(1)$对称性,我们能够解决这些差异,并获得与预期的状态计数和共形重量的纠缠谱。

英文摘要:

Projected entangled pair states (PEPS) provide exact representations for many non-chiral topologically ordered states whereas their range of applicability to interacting chiral topological phases remains largely unsettled. In this context, the symmetries of the local PEPS tensors are crucial for determining the characteristic topological features of the state. In this article we examine the constraints that arise when different symmetries are imposed simultaneously on the local tensor such as internal $SU(2)$, point group and translation symmetry. We show how the interplay of these symmetries manifests in the entanglement spectrum which is the main diagnostic tool for chiral topological order. We apply our results to a spin liquid PEPS introduced previously as a chiral generalization of the resonating valence bond state. Our findings explain the discrepancies observed between the entanglement spectrum of this state and the expected edge spectrum described by a chiral conformal field theory. Finally, in a certain parameter region where this PEPS possesses an additional $U(1)$ symmetry we are able to resolve these discrepancies and obtain an entanglement spectrum with the expected state countings and conformal weight.

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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