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arXiv 1905.07548cond-mat.mes-hallcond-mat.othercond-mat.quant-gascond-mat.str-elquant-ph
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与系统非厄米性无关的拓扑相变

Topological Phase Transition Independent of System Non-Hermiticity

K. L. Zhang, H. C. Wu, L. Jin, Z. Song

摘要:

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-边界对应成立,拓扑相变和(不)存在的边缘状态是不变的,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不变,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。非厄米拓扑结构材料具有与非厄米相变无关的拓扑相变特性,这对非厄米拓扑结构材料的应用具有重要意义。

英文摘要:

Non-Hermiticity can vary the topology of system, induce topological phase transition, and even invalidate the conventional bulk-boundary correspondence. Here, we show the introducing of non-Hermiticity without affecting the topological properties of the original chiral symmetric Hermitian systems. Conventional bulk-boundary correspondence holds, topological phase transition and the (non)existence of edge states are unchanged even though the energy bands are inseparable due to non-Hermitian phase transition. Chern number for energy bands of the generalized non-Hermitian system in two dimension 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. Topological phase transition independent of non-Hermitian phase transition is a unique feature that beneficial for future applications of non-Hermitian topological materials.

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