Topological phases and Anderson localization in off-diagonal mosaic lattices

Topological phases and Anderson localization in off-diagonal mosaic lattices
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非对角镶嵌晶格中的拓扑相和安德森定位

DOI:
10.1103/physrevb.104.064203
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发表时间:
2021-06
期刊:
影响因子:
3.7
通讯作者:
Rong Lü
Rong Lü
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Qi-Bo Zeng;Rong Lü

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我们引入了一种一维晶格模型,它的跳频振幅在等间隔的位置被调制。这种镶嵌晶格显示出许多有趣的拓扑和局部化现象,这些现象在规则的非对角晶格中不存在。当马赛克调制与底层晶格相称时,在调谐调制时观察到具有零能量和非零能量边缘模式的拓扑非平凡相位,其中非平凡状态由量子化的贝里相位表征。如果马赛克晶格变得不相称,则安德森局域化将纯粹由准周期非对角调制引起。发现局域本征态以两个由准周期跳变项连接的相邻位置为中心。此外,在二维推广中,相称和不相称的非对角线镶嵌格子都可以容纳陈氏绝缘子。我们的工作为探索低维系统中的拓扑相位和安德森局域化提供了一个平台。
We introduce a one-dimensional lattice model whose hopping amplitudes are modulated for equally spaced sites. Such mosaic lattice exhibits many interesting topological and localization phenomena that do not exist in the regular off-diagonal lattices. When the mosaic modulation is commensurate with the underlying lattice, topologically nontrivial phases with zeroand nonzero-energy edge modes are observed as we tune the modulation, where the nontrivial regimes are characterized by quantized Berry phases. If the mosaic lattice becomes incommensurate, Anderson localization will be induced purely by the quasiperiodic off-diagonal modulations. The localized eigenstate is found to be centered on two neighboring sites connected by the quasiperiodic hopping terms. Furthermore, both the commensurate and incommensurate off-diagonal mosaic lattices can host Chern insulators in their two-dimensional generalizations. Our work provides a platform for exploring topological phases and Anderson localization in low-dimensional systems.
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