论文标题
晶体材料的结构组成对应关系，以实现声谷孔效应和单向声音指导
Structure-Composition Correspondence in Crystalline Metamaterials for Acoustic Valley-Hall Effect and Unidirectional Sound Guiding
论文作者
论文摘要
最近，凝结物理学中拓扑绝缘子的领域一直吸引着有趣而令人兴奋的发现。值得注意的是，根据行进电子的自旋将电流引导向特定方向的能力具有很大的电子设备潜力。这种新现象已在电磁和声学中转移到经典领域，揭示了引导波的伪旋转锁定。但是，这些宏观类似物是光子/音调晶体，它们本质上是波长缩放的。在这项工作中，我们使用苏打水罐的晶格实现了在听觉政策中谷洞效应的真正声学类似物。这种非常简单的超材料的结晶描述使我们能够在实验上证明声音的单向激发量比操作波长小得多。这些结果不仅将诱人的山谷流体现象打开了可听见的状态，而且还可以设想紧凑的应用程序进行声学操作。
Recently, the domain of topological insulators in condensed matter physics has been teeming with intriguing and very exciting discoveries. Notably, the capacity of guiding currents towards specific directions according to the spin of the travelling electrons has a great potential for electronic devices. This new phenomenon has been transposed to the classical domain in electromagnetics and acoustics, unveiling the pseudo-spin locking of guided waves. However, these macroscopic analogues are photonic/phononic crystals which are intrinsically wavelength scaled. In this work, we realize a genuine acoustic analogue of the valley-Hall effect in the audible regime using a lattice of soda cans. The crystalline description of this very simple metamaterial allows us to demonstrate experimentally the unidirectional excitation of sound guided at a scale much smaller than the wavelength of operation. These results not only open the tantalizing valley-topological phenomena to the audible regime but also allow to envision compact applications for acoustic manipulation.
