发表机构
Tongji University; Mohammed VI Polytechnic University（同济大学; 穆罕默德六世polytechnic大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过逆向设计声学超材料，在同一系统中实现了谷和赝自旋自由度的多路复用，并实验验证了多频声能增强，为鲁棒的多路复用声学器件提供了新策略。
AI 中文摘要
谷和赝自旋是拓扑声学中的基本自由度（DOFs）。然而，迄今为止它们大多在分离的系统中实现。在这里，我们在一个声学系统中实现了谷和赝自旋自由度的多路复用。通过所发展的拓扑优化方法，逆向设计了一种同时承载单狄拉克锥和双狄拉克锥的声学超材料。随后，在硬边界条件下，谷锁定手性态和赝自旋锁定螺旋态在两个分离的频率窗口内出现，并可通过调节工作频率进行选择。此外，实验证明了它们在多频声能增强中的应用。我们的工作提供了一种在单一集成平台内调制携带不同拓扑自由度的声波的策略，促进了具有鲁棒性的多路复用声学器件的发展。
英文摘要
Valley and pseudospin are fundamental degrees of freedom (DOFs) in topological acoustics. However, they have so far been realized mostly in separate systems. Here, we achieve the multiplexing of valley and pseudospin DOFs in one acoustic system. An acoustic metamaterial simultaneously hosting single and double Dirac cones is inversely designed by the developed topology optimization method. Thereafter, under a hard-boundary condition, valley-locked chiral states and pseudospin-locked helical states emerge within two separate frequency windows and can be selected by tuning the operating frequency. Furthermore, their applications for multifrequency acoustic energy enhancement are experimentally demonstrated. Our work provides a strategy to modulate acoustic waves carrying distinct topological DOFs within a single integrated platform, facilitating the development of multiplexed acoustic devices with robustness.
Comments10 pages, 10 figures
