论文标题
声自旋-1 Weyl半学
Acoustic spin-1 Weyl semimetal
论文作者
论文摘要
拓扑半学，托管自旋-1 Weyl点以外的Dirac和Weyl点，引起了很多关注。但是，尚未发现Spin-1 Weyl半学，它在干净的频率窗口中仅具有Spin-1 Weyl点，而没有任何其他淋巴结点阴影，但尚未发现。在这里，我们首次报告了音调晶体中的自旋-1 Weyl半分。它的自旋-1 Weyl点是由两个线性分散体和一个额外的平坦带触及的，携带单电荷电荷（-2,0,2）或（2,0，-2），对于从下到顶部的三个频段而言，并在第1和2频段之间以及2ND和3RD波段之间产生双重Fermi弧。我们进一步观察到对多个关节的强大传播和声学表面弧波的拓扑负折射。我们的结果铺平了在宏观尺度上探索的方式，即自旋-1 Weyl物理学的外来特性。
Topological semimetal, hosting spin-1 Weyl point beyond Dirac and Weyl points, has attracted a great deal of attention. However, the spin-1 Weyl semimetal, which possesses exclusively the spin-1 Weyl points in a clean frequency window, without shadowed by any other nodal points, is yet to be discovered. Here, we report for the first time a spin-1 Weyl semimetal in a phononic crystal. Its spin-1 Weyl points, touched by two linear dispersions and an additional flat band, carry monopole charges (-2,0,2) or (2,0,-2) for the three bands from bottom to top, and result in double Fermi arcs existing both between the 1st and 2nd bands, as well as between the 2nd and 3rd bands. We further observe robust propagation against the multiple joints and topological negative refraction of acoustic surface arc wave. Our results pave the way to explore on the macroscopic scale the exotic properties of the spin-1 Weyl physics.
