Topological phase transition independent of system non-Hermiticity

Topological phase transition independent of system non-Hermiticity
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拓扑相变与系统非厄米性无关

DOI:
10.1103/physrevb.100.045141
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发表时间:
2019-05
期刊:
影响因子:
3.7
通讯作者:
Zhi Song
Zhi Song
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
K. L. Zhang;H. C. Wu;Liang Jin;Zhi Song

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非厄米性可以改变系统的拓扑结构,引起拓扑相变,甚至使传统的体-边界对应失效。在这里,我们展示了非厄米性的引入,而不影响原来的手征对称厄米系统的拓扑性质。传统的体边界对应保持不变,拓扑相变和(非)存在的边缘状态,即使由于非厄米相变的能带是不可分割的。证明了二维广义非厄米系统能带的陈数是不变的,并与模拟的拓扑电荷泵相吻合。我们的研究结果提供了深入了解非厄米性和拓扑结构之间的相互作用。与非厄米特相变无关的拓扑相变是一个独特的特征,这对非厄米特拓扑材料的未来应用是有益的。
Non-Hermiticity can vary the topology of system, induce topological phase transitions, and even invalidate the conventional bulk-boundary correspondence. Here, we show the introduction of non-Hermiticity without affecting the topological properties of the original chiral symmetric Hermitian systems. Conventional bulk-boundary correspondence holds; the topological phase transition and the (non)existence of edge states are unchanged even though the energy bands are inseparable due to non-Hermitian phase transitions. The Chern number for energy bands of the generalized non-Hermitian system in two dimensions is proved to be unchanged and favorably coincides with the simulated topological charge pumping. Our findings provide insights into the interplay between non-Hermiticity and topology. A topological phase transition independent of the non-Hermitian phase transition is a unique feature that is beneficial for future applications of non-Hermitian topological materials.
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