莫尔声子晶格中声学的朗道能级和范德华界面
Landau Levels and van der Waals Interfaces of Acoustics in Moiré Phononic Lattices
摘要：
由平行但交错的周期性晶格组成的莫尔晶格由于其显著的物理性质而被广泛探索，例如van Hove奇点[1，2]，可重复的不可重复的跃迁[3]，非阿贝尔规范势[4]，分数量子霍尔效应[5-7]，范德华界面[8，9]和非常规超导性[10，11]。然而，有有限的示范，这些概念的经典波系统。在这里，我们实现了规范场在一维莫尔声子晶格由两个叠加的周期图案，相互不匹配沿一个方向。利用规范场，我们在狄拉克锥附近产生了朗道能级平坦带，并实验测量了它们在压力场分布中的空间局域化。然后，通过在两个方向上的失配，我们构造了具有范德华界面的二维莫尔声子晶格。我们发现，声波有效地沿着范德瓦尔斯界面传输表现为金属网络。由于失配晶格具有良好的可控性，我们的研究为传统周期性声学系统中无法实现的声波操控提供了一条新的途径，并且可以很容易地扩展到力学、光学、电磁学和电子学等领域。
英文摘要：
Moiré lattices which consist of parallel but staggered periodic lattices have been extensively explored due to their salient physical properties, such as van Hove singularities[1, 2], commensurable incommensurable transitions[3], non-Abelian gauge potentials[4], fractional quantum Hall effects[5-7], van der Waals interfaces[8, 9] and unconventional superconductivity[10, 11]. However, there are limited demonstrations of such concepts for classical wave systems. Here, we realized gauge fields in one-dimensional Moiré phononic lattices consisting of two superimposed periodic patterns which mismatched with each other along one direction. Benefiting from gauge fields, we generated Landau level flat bands near the Dirac cone and experimentally measured their spatial localization in pressure-field distributions. Then, by mismatching lattices along both directions, we constructed two-dimensional Moiré phononic lattices with van der Waals interfaces. We found that acoustic waves efficiently transported along van der Waals interfaces behaving as metallic networks. As mismatched lattices are well-controllable, our study offers a novel path to manipulate sound waves which are inaccessible in traditional periodic acoustic systems, and can be easily extended to mechanics, optics, electromagnetics and electronics.
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。
