Topological Floquet interface states in optical fiber loops
Topological Floquet interface states in optical fiber loops
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DOI：
10.1103/physreva.102.053511
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发表时间：
2020-11-12
影响因子：
2.9
通讯作者：
Egorov, O. A.
中科院分区：
文献类型：
--
作者：
Bisianov, A.;Muniz, A.;Egorov, O. A.
在（1 + 1）维离散光子行走中，我们通过实验观察到一对拓扑异常Floquet界面态共存。我们明确地验证了这些状态对局部静态扰动的鲁棒性，尊重系统的手性对称性，以及它们对非平稳扰动的脆弱性。该行走是基于脉冲在一对不同长度的耦合光纤环路中传播，具有动态可变的相互耦合。拓扑界面是通过其中一个环路中的相位调制创建的，这允许在界面处出现异常的Floquet拓扑跃迁。
We experimentally observe a coexisting pair of topological anomalous Floquet interface states in a (1 + 1)-dimensional discrete photon walk. We explicitly verify the robustness of these states against local static perturbations respecting the chiral symmetry of the system, as well as their vulnerability against nonstationary perturbations. The walk is implemented based on pulses propagating in a pair of coupled fiber loops of dissimilar lengths with dynamically variable mutual coupling. The topological interface is created via phase modulation in one of the loops, which allows for an anomalous Floquet topological transition at the interface.