Renormalization group approach to non-Hermitian topological quantum criticality

Renormalization group approach to non-Hermitian topological quantum criticality
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非厄米拓扑量子临界性的重正化群方法

DOI:
10.1103/physrevb.102.205116
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发表时间:
2020-05
期刊:
Phys. Rev. B
影响因子:
--
通讯作者:
Baigeng Wang
Baigeng Wang
中科院分区:
其他
文献类型:
--
作者:
Boran Zhou;Rui Wang;Baigeng Wang

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在重整化群(RG)理论中,对称性破缺相之间的临界转变点被描述为不动点。我们证明,遵循追踪大动量模的标准威尔逊程序,这一众所周知的事实在非厄米系统中是可以被打破的。基于非厄米特的Su-Schrieffer-Hegger(SSH)模型,我们提出了一种实空间抽取方案来研究拓扑和平凡相之间的临界性。我们给出了具体的例子和分析证明,表明实空间格式很好地克服了标准方法的不足,特别是在RG下它总是保持系统在临界点的不动点。通过排除不相关的算子,该方法还可以极大地简化复杂非埃尔米特模型临界点的搜索。这些结果为基于RG的更先进的相互作用非厄米量子系统技术铺平了道路。
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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影响因子: 3.7
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