Floquet engineering of topological localization transitions and mobility edges in one-dimensional non-Hermitian quasicrystals

Floquet engineering of topological localization transitions and mobility edges in one-dimensional non-Hermitian quasicrystals
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一维非厄米准晶拓扑局部化跃迁和迁移边缘的Floquet工程

DOI:
10.1103/physrevresearch.3.033184
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发表时间:
2021-06
影响因子:
4.2
通讯作者:
Zhou Longwen
Zhou Longwen
中科院分区:
--
文献类型:
--
作者:
Zhou Longwen

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时间周期驱动场可以赋予系统特殊的拓扑和输运特性。在这项工作中,我们通过周期性地摇动晶格,在非厄米准晶中发现了动态控制的局域化跃迁和迁移率边。驱动力改变了晶格位置之间的跳跃幅度,导致局域化、迁移率边缘和扩展的非厄米准晶相之间的交替跃迁。我们将我们的Floquet工程方法应用于五个具有代表性的非厄米准晶模型,得到了光子辅助局域跃迁和迁移率边的条件,并得到了一些模型的Lyapunov指数的表达式。此外,我们还引入了Floquite准能的拓扑缠绕数来区分具有不同局域化性质的非厄米准晶相。因此,我们的发现将准晶的研究扩展到了非厄米Floquite系统,并提供了一种有效的方法来调制这些独特相的拓扑和输运性质。
Time-periodic driving fields could endow a system with peculiar topological and transport features. In this work, we find dynamically controlled localization transitions and mobility edges in non-Hermitian quasicrystals via shaking the lattice periodically. The driving force dresses the hopping amplitudes between lattice sites, yielding alternate transitions between localized, mobility edge and extended non-Hermitian quasicrystalline phases. We apply our Floquet engineering approach to five representative models of non-Hermitian quasicrystals, obtain the conditions of photon-assisted localization transitions and mobility edges, and find the expressions of Lyapunov exponents for some models. We further introduce topological winding numbers of Floquet quasienergies to distinguish non-Hermitian quasicrystalline phases with different localization nature. Our discovery thus extend the study of quasicrystals to non-Hermitian Floquet systems, and provide an efficient way of modulating the topological and transport properties of these unique phases.
非厄米准周期晶格中的广义奥布里-安德烈自对偶性和迁移边
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