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arXiv 2008.01914cond-mat.softcond-mat.mtrl-sci
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刚性机械超材料中对称性保护的软拓扑模

Soft topological modes protected by symmetry in rigid mechanical metamaterials

Hridesh Kedia, Anton Souslov, D. Zeb Rocklin

摘要:

拓扑力学可以在机械超材料中实现软模式,其中粒子运动的自由度的数量通过粒子间相互作用提供的约束来精细地平衡。但是,实体对象通常是超静态的(或过约束的)。在这里,我们将展示如何对称性可以应用到生成拓扑软模式,即使在过度约束,刚性系统。为此,我们考虑基于非正方形矩阵的非厄米拓扑结构,并设计了一种超静定材料,在该材料中,受拓扑结构和对称性保护的低能模式出现在界面处。我们的方法提出了一种新的方法,在鲁棒的无标度架构中产生柔软度,适合于小型化到纳米级。

英文摘要:

Topological mechanics can realize soft modes in mechanical metamaterials in which the number of degrees of freedom for particle motion is finely balanced by the constraints provided by interparticle interactions. However, solid objects are generally hyperstatic (or overconstrained). Here, we show how symmetries may be applied to generate topological soft modes even in overconstrained, rigid systems. To do so, we consider non-Hermitian topology based on non-square matrices, and design a hyperstatic material in which low-energy modes protected by topology and symmetry appear at interfaces. Our approach presents a novel way of generating softness in robust scale-free architectures suitable for miniaturization to the nanoscale.

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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