The study of topological semimetals hosting spin-1 Weyl points (WPs) beyond Dirac points and WPs has attracted a great deal of attention. However, a spin-1 Weyl semimetal that exclusively possesses spin-1 WPs in a clean frequency window without being shadowed by any other nodal points is yet to be discovered. This study reports a spin-1 Weyl semimetal in a phononic crystal. Its spin-1 WPs are touched by two linear dispersions and an additional flat band and carry monopole charges (−2,0,2) or (2,0,−2) for the three bands from the bottom to the top. They result in double Fermi arcs, which occur between the first and second bands, as well as between the second and third bands. Further robust propagation is observed against the multiple joints and topological negative refraction of the acoustic surface arc wave. The results of this study create the basis for the exploration of the unusual properties of spin-1 Weyl physics on a macroscopic scale.

中文翻译：

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声学自旋1 Weyl半金属

超越Dirac点和WP的自旋1 Weyl点（WP）的拓扑半金属的研究引起了广泛的关注。然而，尚未发现在干净的频率窗口中专有拥有spin-1 WP的spin-1 Weyl半金属，而不会被任何其他节点遮挡。这项研究报告了自旋1 Weyl半金属的声子晶体。它的spin-1 WP被两个线性色散和一个附加的平坦带所触摸，并为从底部到顶部的三个带携带单极电荷（−2,0,2）或（2,0，−2）。它们导致在第一和第二频段之间以及第二和第三频段之间出现双费米弧。观察到针对多个接头的进一步稳健传播以及声表面弧波的拓扑负折射。