Cui Zhenxing, Wu Chaohua, Wei Qiang, Yan Mou, Chen Gang
Key Laboratory of Materials Physics of Ministry of Education, School of Physics, <a href="https://ror.org/04ypx8c21">Zhengzhou University</a>, Zhengzhou 450001, China.
Laboratory of Zhongyuan Light, School of Physics, <a href="https://ror.org/04ypx8c21">Zhengzhou University</a>, Zhengzhou 450001, China.
Phys Rev Lett. 2024 Dec 20;133(25):256602. doi: 10.1103/PhysRevLett.133.256602.
Manipulating elastic waves in lower-dimensional mechanical metamaterials has attracted much attention since it lays the foundation for the design of various elastic functional devices, especially for on-chip size. However, due to the experimental challenges, it is very difficult to control elastic waves in higher dimensions. In this Letter, we introduce an extra structural parameter to synthesize and investigate the on-chip Weyl physics in silicon-on-insulator system. Interestingly, we engineer an in-plane pseudomagnetic field to realize chiral Landau levels, which provides a bulk channel supporting robust energy transport. We also observe the pseudomagnetic field-induced boundary states near the diagonal corners, which are quite different from conventional higher order topological corner states. With the aid of the synthetic dimension, we can not only realize the multidimensional elastic wave manipulations, but more importantly, devise a novel strategy to explore the higher dimensional physics on an integrated platform.
自从在低维机械超材料中操控弹性波为各种弹性功能器件的设计奠定基础，尤其是在芯片尺寸方面的设计，它就备受关注。然而，由于实验挑战，在更高维度中控制弹性波非常困难。在本信函中，我们引入一个额外的结构参数来合成并研究绝缘体上硅系统中的片上外尔物理。有趣的是，我们设计了一个面内赝磁场以实现手性朗道能级，这提供了一个支持稳健能量传输的体通道。我们还观察到在对角角落附近由赝磁场诱导的边界态，这与传统的高阶拓扑角态有很大不同。借助合成维度，我们不仅可以实现多维弹性波操控，更重要的是，还能设计出一种在集成平台上探索高维物理的新策略。
