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Topological phase transition independent of system non-Hermiticity

机译：拓扑相变与系统非赫耳特性无关

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摘要

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.
机译：非赫米蒂性可以改变系统的拓扑结构，引起拓扑相变，甚至使常规的体边界对应失效。在这里，我们展示了非赫米替性的引入而又不影响原始手性对称厄米系统的拓扑特性。常规的批量边界通信保持有效；即使由于非赫米特相变而使能带不可分离，拓扑相变和边缘态的（不）存在也没有改变。二维非广义Hermitian系统能带的Chern数被证明是不变的，并且与模拟拓扑电荷泵有利地吻合。我们的发现提供了对非赫米蒂性和拓扑之间相互作用的见解。独立于非Hermitian相变的拓扑相变是一个独特的功能，有利于非Hermitian拓扑材料的未来应用。

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  • 来源
    《Physical review》 |2019年第4期|045141.1-045141.16|共16页
  • 作者

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

  • 作者单位

    Nankai Univ, Sch Phys, Tianjin 300071, Peoples R China;

    Nankai Univ, Sch Phys, Tianjin 300071, Peoples R China;

    Nankai Univ, Sch Phys, Tianjin 300071, Peoples R China;

    Nankai Univ, Sch Phys, Tianjin 300071, Peoples R China;

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