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arXiv 2005.03841cond-mat.str-elcond-mat.stat-mechquant-ph
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拓扑序波函数中内禀符号的非厄米效应

Non-Hermitian effects of the intrinsic signs in topologically ordered wavefunctions

Qi Zhang, Wen-Tao Xu, Zi-Qi Wang, Guang-Ming Zhang

摘要:

多体波函数中的负号在量子力学中起着重要的作用。二维六角晶格上双半介子模型的基态波函数含有一个不能用任何局域变换去除的内禀符号。本文提出了一种张量网络表示的一般双半子波函数,并将波函数范数映射到具有虚磁场和虚三自旋三角面相互作用的三角格点Ashkin-Teller模型的配分函数上.为了解决这个非厄米模型与宇称时间(PT)对称性,数值张量网络方法,并确定了全球相图。在双半子相附近,我们发现了一个由非幺正共形场论描述的无隙密圈相和一个具有配分函数零点的PT对称破缺相。因此,在拓扑有序波函数的内禀符号与PT对称非厄米统计模型之间建立了联系。

英文摘要:

Negative signs in many-body wavefunctions play an important role in quantum mechanics. The ground-state wavefunction of double semion model on a two-dimensional hexagonal lattice contains an intrinsic sign which cannot be removed by any local transformation. Here we proposed a generic double semion wavefunction in tensor network representation, and the wavefunction norm is mapped to the partition function of a triangular lattice Ashkin-Teller model with imaginary magnetic fields and imaginary three-spin triangular face interactions. To solve this non-Hermitian model with parity-time (PT) symmetry, numerical tensor-network methods are employed, and a global phase diagram is determined. Adjacent to the double semion phase, we find a gapless dense loop phase described by non-unitary conformal field theory and a PT-symmetry breaking phase with zeros of the partition function. So a connection has established between the intrinsic signs in the topologically ordered wavefunction and the PT-symmetric non-Hermitian statistical model.

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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