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arXiv 2005.10112cond-mat.str-el
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非厄米拓扑量子临界性的重整化群方法

A renormalization group approach to non-Hermitian topological quantum criticality

Boran Zhou, Rui Wang, Baigeng Wang

摘要:

在重整化群(RG)理论中,临界相变点被刻画为不动点。我们表明,按照标准的威尔逊程序,追查出大的动量模式,这一众所周知的事实可以打破在非厄米系统。基于非Hermitian Su-Schrieffer-Hegger(SSH)型模型,我们提出了一个实空间抽取方案来研究拓扑相和平凡相之间的临界性。我们提供了具体的例子和分析证明表明,实空间计划完美地克服了标准方法的不足,特别是在这个意义上,它总是保持系统在临界状态下的RG下的不动点。对于复杂的非厄米模型,该方法通过排除不相关的算子,可以大大简化临界点的搜索。这些结果为更先进的基于RG的相互作用非厄米量子系统的技术铺平了道路。

英文摘要:

Critical transition points between symmetry-broken phases are characterized as fixed points in the renormalization group (RG) theory. We show that, following the standard Wilsonian procedure that traces out the large momentum modes, this well known fact can break down in non-Hermitian systems. Based on non-Hermitian Su-Schrieffer-Hegger (SSH)-type models, we propose a real-space decimation scheme to study the criticality between the topological and trivial phase. We provide concrete examples and an analytic proof to show that the real-space scheme perfectly overcomes the insufficiency of the standard method, especially in the sense that it always preserves the system at criticality as fixed points under RG. The proposed method can also greatly simplify the search of critical points for complicated non-Hermitian models by ruling out the irrelevant operators. These results pave the way towards more advanced RG-based techniques for the interacting non-Hermitian quantum systems.

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