从费米子/仿费米子拓扑态解码量子临界性
Decoding quantum criticalities from fermionic/parafermionic topological states
摘要：
对于奇数自旋链，在一维对称性保护的拓扑相中，采用Affleck-Kennedy-Lieb-Tasaki矩阵乘积态波函数，在适当的对称体二分性下，可以得到一个体临界纠缠谱，它描述了拓扑相与具有相同对称性的平凡相分离的临界点的激发谱.这样的临界点超出了对称破缺相变的标准朗道-金兹伯格-威尔逊范式。最近，马约拉纳费米子/副费米子拓扑相的矩阵乘积态的框架已经建立。本文首先将这些关联长度为零的不动点矩阵乘积态推广到更一般的一维Majorana费米子/仿费米子相互作用系统的有限关联长度的基态波函数。然后，我们采用以前的方法解码量子临界从相互作用的马约拉纳费米子/仿费米子矩阵乘积态。用中心荷$c\leq 1$的共形场论描述了所得到的量子临界谱，表征了将费米子/副费米子拓扑相与具有相同对称性的平凡相分离的量子临界理论.
英文摘要：
Under an appropriate symmetric bulk bipartition in a one-dimensional symmetry protected topological phase with the Affleck-Kennedy-Lieb-Tasaki matrix product state wave function for the odd integer spin chains, a bulk critical entanglement spectrum can be obtained, describing the excitation spectrum of the critical point separating the topological phase from the trivial phase with the same symmetry. Such a critical point is beyond the standard Landau-Ginzburg-Wilson paradigm for symmetry breaking phase transitions. Recently, the framework of matrix product states for topological phases with Majorana fermions/parafermions has been established. Here we first generalize these fixed-point matrix product states with the zero correlation length to the more generic ground-state wave functions with a finite correlation length for the general one-dimensional interacting Majorana fermion/parafermion systems. Then we employ the previous method to decode quantum criticality from the interacting Majorana fermion/parafermion matrix product states. The obtained quantum critical spectra are described by the conformal field theories with central charge $c\leq 1$, characterizing the quantum critical theories separating the fermionic/parafermionic topological phases from the trivial phases with the same symmetry.
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