论文标题
环谐振晶格中的异常浮子非铁皮皮肤效应
Anomalous Floquet non-Hermitian skin effect in a ring resonator lattice
论文作者
论文摘要
我们提出了一个一维耦合的环形谐振晶格，该晶格表现出我们称为异常的Floquet NHSE的非遗传性皮肤效应（NHSE）的变体。与现有的方法通过在不同环段上的工程增益和损失来实现NHSE的方法不同，我们的设计使用固定的每个环上的现场增益或损失。异常的Floquet NHSE的标志是浮雕否定器的每个值都存在皮肤模式，从而允许宽带不对称的传播。改变增益/损失会导致非炎性拓扑相变，从而逆转皮肤模式的定位方向。声学晶格中的实验实现与理论预测相吻合，相对带宽非常广泛约40％。
We present a one-dimensional coupled ring resonator lattice exhibiting a variant of the non- Hermitian skin effect (NHSE) that we call the anomalous Floquet NHSE. Unlike existing approaches to achieving the NHSE by engineering gain and loss on different ring segments, our design uses fixed on-site gain or loss in each ring. The anomalous Floquet NHSE is marked by the existence of skin modes at every value of the Floquet quasienergy, allowing for broadband asymmetric transmission. Varying the gain/loss induces a non-Hermitian topological phase transition, reversing the localization direction of the skin modes. An experimental implementation in an acoustic lattice yields good agreement with theoretical predictions, with a very broad relative bandwidth of around 40%.
