AI 中文总结
该研究开发相位可控仿面声波平台，利用莫尔声晶格构建声学拓扑纹理，实现可控声学斯格明子袋与meron簇，提升缺陷耐受性，为声学拓扑操控及编码提供可重构平台。
AI 中文摘要
由扭转周期系统形成的莫尔超晶格为涌现拓扑现象提供了强大平台，但其在声场中编程实空间拓扑的应用仍基本未被探索。本文报道一种相位可控的仿面声波平台，用于在声学粒子速度场中构建莫尔拓扑纹理。在穿孔声学超表面上，合成并叠加两个扭转斯格明子晶格，得到具有可控拓扑数和几何结构的声学斯格明子袋。扭转角和旋转中心控制斯格明子袋的尺度与构型，实现复合纹理的确定性重塑。我们进一步引入可控缺陷评估莫尔斯格明子袋的缺陷耐受性，发现斯格明子袋在有限缺陷密度范围内保留其复合拓扑，与未扭转的单层斯格明子晶格对比显示，在较高缺陷密度下，封闭的斯格明子簇相比单层参考具有更高的稳定性。该可编程平台还支持从斯格明子晶格到meron晶格的转变，并可实现扭转诱导的meron簇。这些发现确立声学莫尔超晶格为构建鲁棒实空间拓扑纹理的可重构平台，在拓扑引导的声学操控和信息编码领域具有潜在应用。
英文摘要
Moire superlattices formed by twisting periodic systems provide a powerful platform for emergent topological phenomena, but their use for programming real-space topology in acoustic wave fields remains largely unexplored. Here we report a phase-controlled spoof surface acoustic wave platform for constructing moire topological textures in the acoustic particle-velocity field. On a perforated acoustic metasurface, two twisted skyrmion lattices are synthesized and superposed, yielding acoustic skyrmion bags with controllable topological numbers and geometries. The twist angle and rotation center control the scale and configuration of the bags, enabling deterministic reshaping of the composite texture. We further introduce controlled defects to assess the defect tolerance of the moire skyrmion bags. The skyrmion bags retain their composite topology over a finite range of defect densities, and comparison with an untwisted single-layer skyrmion lattice suggests enhanced stability of the enclosed skyrmion cluster relative to the single-layer reference at higher defect densities. The same programmable platform also supports transitions from skyrmion lattices to meron lattices and enables twist-induced meron clusters. These findings establish acoustic moire superlattices as a reconfigurable platform for engineering robust real-space topological textures, with potential applications in topology-guided acoustic manipulation and information encoding.
Comments20 pages, 5 figures
