非 reciprocal 的拓扑 kink 波在机械元材料中的传播
Nonreciprocal topological kink-wave propagation in mechanical metamaterials
AI总结：
该研究通过机械元材料实现非 reciprocal 的拓扑 kink 波传播，利用非线性机制产生单向传播的 soliton-like 激励，展示了非线性拓扑功能的实现方法。
摘要：
非线性机械元材料可以表现出新兴的传输现象，这些现象可以模仿拓扑保护，而无需依赖线性带拓扑。在这里，我们实现了由分支引起的非 reciprocal 晶格，该晶格支持弹性 kink 波的稳健传播。每个单元是一个预应变、铰链梁 circulator，在 buckling 状态之间 snapping 时发展出角动量偏差，产生有效的时间反演对称性破坏。将这些单元耦合到六边形阵列中，会形成一个机械 chiral 网络，在其中局部 soliton-like 激励沿着界面和边缘单向传播，对锐角弯折具有免疫力。我们展示了由 SineGordon 类场主导的非色散 kink 传输，其有效偏差编码了机械 chirality。该框架连接了分支动力学和非 reciprocal 传输，建立了非线性路径，以拓扑样的机械功能为目标，而无需磁性或陀螺偏转。
英文摘要：
Nonlinear mechanical metamaterials can exhibit emergent transport phenomena that mimic topological protection without relying on linear band topology. Here, we realize a bifurcation-induced nonreciprocal lattice that supports robust propagation of elastic kink waves. Each unit is a prestrained, hinged-beam circulator that develops angular momentum bias during snap-through transitions between buckling states, producing an effective breaking of time reversal symmetry. Coupling such units into a hexagonal array yields a mechanically chiral network where localized soliton-like excitations propagate unidirectionally along interfaces and edges, immune to sharp bends. We demonstrate non-dispersive kink transport governed by a SineGordon type field whose effective bias encodes mechanical chirality. This framework bridges bifurcation dynamics and nonreciprocal transport, establishing a nonlinear route toward topological like mechanical functionality without magnetic or gyroscopic bias.
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