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arXiv 1504.03362cond-mat.softcond-mat.mes-hall
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陀螺超材料的拓扑力学

Topological mechanics of gyroscopic metamaterials

Lisa M. Nash, Dustin Kleckner, Alismari Read, Vincenzo Vitelli, Ari M. Turner, William T. M. Irvine

摘要:

拓扑机械超材料是一种人工结构,其不寻常的特性与电子和光学材料一样受到保护。在这里,我们提出了一个实验和理论研究的主动超材料-包括耦合陀螺仪的晶格-打破时间反演对称。这些新结构的振动光谱显示出一个由拓扑保护的边缘模式填充的声波间隙,这些边缘模式仅在一个方向上传播,不受无序的影响。我们提出了一个数学模型,解释了如何通过控制底层晶格的扭曲的边缘模式的手征可以切换。这种效应允许根据需要确定边沿电流的方向。我们设想这些边缘模式的应用程序的无损耗,单向,声波波导的设计,并在实验中证明这一功能。

英文摘要:

Topological mechanical metamaterials are artificial structures whose unusual properties are protected very much like their electronic and optical counterparts. Here, we present an experimental and theoretical study of an active metamaterial -- comprised of coupled gyroscopes on a lattice -- that breaks time-reversal symmetry. The vibrational spectrum of these novel structures displays a sonic gap populated by topologically protected edge modes which propagate in only one direction and are unaffected by disorder. We present a mathematical model that explains how the edge mode chirality can be switched via controlled distortions of the underlying lattice. This effect allows the direction of the edge current to be determined on demand. We envision applications of these edges modes to the design of loss-free, one-way, acoustic waveguides and demonstrate this functionality in experiment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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