Non-Hermitian Band Topology and Skin Modes in Active Elastic Media
Non-Hermitian Band Topology and Skin Modes in Active Elastic Media
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DOI：
10.1103/physrevlett.125.118001
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发表时间：
2020-09-09
影响因子：
8.6
通讯作者：
Vitelli, Vincenzo
中科院分区：
文献类型：
--
作者：
Scheibner, Colin;Irvine, William T. M.;Vitelli, Vincenzo
由活性组分构成的固体可以表现出非互易弹性系数，从而引起非厄米波现象。在这里，我们研究非厄米效应存在于二维主动弹性介质的边界处，服从两个一般假设：它们的微观力守恒线性动量，只产生于静态变形。使用连续方程，我们证明了非厄米趋肤效应的存在，其中边界主机的本地化模式的广泛数量。此外，晶格模型揭示了非埃尔米特拓扑转换介导的特殊环驱动的活动水平的个别债券。
Solids built out of active components can exhibit nonreciprocal elastic coefficients that give rise to non-Hermitian wave phenomena. Here, we investigate non-Hermitian effects present at the boundary of two-dimensional active elastic media obeying two general assumptions: their microscopic forces conserve linear momentum and arise only from static deformations. Using continuum equations, we demonstrate the existence of the non-Hermitian skin effect in which the boundary hosts an extensive number of localized modes. Furthermore, lattice models reveal non-Hermitian topological transitions mediated by exceptional rings driven by the activity level of individual bonds.