基于非线性拓扑Maxwell晶格的可开关声子二极管
Switchable phonon diodes using nonlinear topological Maxwell lattices
摘要：
拓扑力学的最新进展揭示了一类具有拓扑保护的软边模的麦克斯韦晶格。这些模式导致强烈不对称的弹性波响应。在本文中，我们展示了如何拓扑麦克斯韦晶格可以用来实现非互易传输的弹性波。我们的设计利用了与拓扑松弛边缘模式的可用性相关的不对称性和机械系统响应中内置的几何非线性，以实现所需的非互易行为，这可以通过添加现场钉扎电位进一步转变为强烈的单向声子输运。此外，我们表明，非互易波传输可以通过拓扑相变打开和关闭，铺平了道路的细胞超材料，可以作为可调拓扑保护声子二极管的设计。
英文摘要：
Recent progress in topological mechanics have revealed a family of Maxwell lattices that exhibit topologically protected floppy edge modes. These modes lead to a strongly asymmetric elastic wave response. In this paper, we show how topological Maxwell lattices can be used to realize non-reciprocal transmission of elastic waves. Our design leverages the asymmetry associated with the availability of topological floppy edge modes and the geometric nonlinearity built in the mechanical systems response to achieve the desired non-reciprocal behavior, which can be further turned into strongly one-way phonon transport via the addition of on-site pinning potentials. Moreover, we show that the non-reciprocal wave transmission can be switched on and off via topological phase transitions, paving the way to the design of cellular metamaterials that can serve as tunable topologically protected phonon diodes.
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