Floquet topological phases of non-Hermitian systems

Floquet topological phases of non-Hermitian systems
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非厄米系统的 Floquet 拓扑相

DOI:
10.1103/physrevb.102.041119
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发表时间:
2020-07
期刊:
影响因子:
3.7
通讯作者:
Jun-Hong An
Jun-Hong An
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hong Wu;Jun-Hong An

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对于具有手性对称和平移不变性的系统,非厄米性引起的拓扑相变中体边界对应(BBC)的破坏可以通过集肤效应得到解决。然而,周期驱动作为工程奇异拓扑相的主动工具,打破了手性对称性,并且不可避免的无序性破坏了平移不变性。在这里,我们提出了一种方案来检索 BBC 并建立对具有或不具有平移不变性的周期性驱动非厄米系统的拓扑相的完整描述。我们的方法在非埃尔米特 Su-Schrieffer-Heeger 模型中的演示表明,边缘态数量广泛可调的奇异非埃尔米特拓扑相和 Floquet 拓扑安德森绝缘体是由周期性驱动和无序引起的。我们的结果提供了一种在非厄米系统中通过周期性驱动人工合成奇异相的有用方法。
The non-Hermiticity caused breakdown of the bulk-boundary correspondence (BBC) in topological phase transition was cured by the skin effect for the systems with chiral symmetry and translation invariance. However, periodic driving, as an active tool in engineering exotic topological phases, breaks the chiral symmetry, and the inevitable disorder destroys the translation invariance. Here, we propose a scheme to retrieve the BBC and establish a complete description of the topological phases of the periodically driven non-Hermitian system both with and without the translation invariance. The demonstration of our method in the non-Hermitian Su-Schrieffer-Heeger model shows that exotic non-Hermitian topological phases of widely tunable numbers of edge states and Floquet topological Anderson insulator are induced by the periodic driving and the disorder. Our result supplies a useful way to artificially synthesize exotic phases by periodic driving in the non-Hermitian system.
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