The topological criticality in disordered non-Hermitian system

The topological criticality in disordered non-Hermitian system
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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:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
Lei Tan
Lei Tan
中科院分区:
其他
文献类型:
--
作者:
Xi-Xi Bao;Gang-Feng Guo;Xue-Peng Du;Huai-Qiang Gu;Lei Tan

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抽象的。无序对拓扑和局域性质有很大的影响。在这里,我们探索不同类型的紊乱(细胞内和细胞间)对非埃尔米特系统的影响。我们首先给出了相图,发现胞内无序和胞间无序可以分别扩大和缩小拓扑区。此外,皮肤效应在非厄米特系统中是独一无二的,它被紊乱所打破。此外,我们还提出了广义局域化长度来解决无序非厄米系统中如何显式确定拓扑相边界的问题。值得注意的是,这个定义的合理性可以通过相似变换来验证,在相似变换中,我们证明了拓扑不变量保持不变。最后,我们定义的一个副产品是,我们可以解析地得到干净限制的非厄米系统中拓扑的临界性。
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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