The topological criticality in disordered non-Hermitian system
The topological criticality in disordered non-Hermitian system
复制标题
无序非厄米系统的拓扑临界性
DOI:
10.1088/1361-648x/abee3d
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发表时间:
2021-03
期刊:
影响因子:
--
通讯作者:
Lei Tan
中科院分区:
文献类型:
--
作者:
Xi-Xi Bao;Gang-Feng Guo;Xue-Peng Du;Huai-Qiang Gu;Lei Tan
Abstract. Disorders have a rich influence on topological and localized properties. Here, we explore the effects of different type of disorders (intracell and intercell) on the non-Hermitian system. We first exhibit the phase diagram and find that the intracell disorder and intercell disorder can broaden and narrow the topological region, respectively. Moreover, the skin effect, which is unique in the non-Hermitian system, is broken by disorders. Furthermore, we propose the generalized localization length to settle the issue of how to determine the topological phase boundary explicitly in the disordered non-Hermitian system. Significantly, the rationality of this definition can be verified by similarity transformation, in which we prove that the topological invariant remains invariant. Finally, a byproduct of our definition is that one can analytically get the criticality of topology in the clean-limit non-Hermitian system.
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