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arXiv 2102.10980cond-mat.str-el
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利用对称张量网络检测阿贝尔拓扑序与非阿贝尔拓扑序之间的转换

Detecting transition between Abelian and non-Abelian topological orders through symmetric tensor networks

Yu-Hsueh Chen, Ching-Yu Huang, Ying-Jer Kao

摘要:

我们提出了一个统一的计划,以确定相变的$\mathbb{Z}_2$阿贝尔拓扑秩序,包括过渡到非阿贝尔手征自旋液体。使用环气和弦气状态[H. - y.利河,巴西-地Kaneko,T. Okubo,N. Kawashima,Phys. Rev. Lett. 123,087203(2019)]上的星格Kitaev模型为例,我们通过传输矩阵计算最小纠缠态的重叠。我们证明,类似于任意子凝聚,连续变形的$\mathbb{Z}_2$-内射投影纠缠对态(PEPS)也允许我们研究阿贝尔和非阿贝尔拓扑秩序之间的过渡。我们证明了定义在阿贝尔相位中的电荷和通量任意子在非阿贝尔拓扑序中转化为$σ$任意子。此外,我们表明,与[Phys. Rev. B 101,035140(2020)]中的声明相反,LG和SG态在非阿贝尔区域中都具有无限的相关长度,这与手性PEPS具有无间隙父哈密顿量的不可行定理一致。

英文摘要:

We propose a unified scheme to identify phase transitions out of the $\mathbb{Z}_2$ Abelian topological order, including the transition to a non-Abelian chiral spin liquid. Using loop gas and and string gas states [H.-Y. Lee, R. Kaneko, T. Okubo, N. Kawashima, Phys. Rev. Lett. 123, 087203 (2019)] on the star lattice Kitaev model as an example, we compute the overlap of minimally entangled states through transfer matrices. We demonstrate that, similar to the anyon condensation, continuous deformation of a $\mathbb{Z}_2$-injective projected entangled-pair state (PEPS) also allows us to study the transition between Abelian and non-Abelian topological orders. We show that the charge and flux anyons defined in the Abelian phase transmute into the $σ$ anyon in the non-Abelian topological order. Furthermore, we show that contrary to the claim in [Phys. Rev. B 101, 035140 (2020)], both the LG and SG states have infinite correlation length in the non-Abelian regime, consistent with the no-go theorem that a chiral PEPS has a gapless parent Hamiltonian.

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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