Acoustic spin-1 Weyl semimetal

Abstract

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.

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Cited by in corpus (5)

• Topological acoustics
• Acoustic Higher-Order Weyl Semimetal with Bound Hinge States in the Continuum
• Intrinsic triple degeneracy point bounded by nodal surfaces in chiral photonic crystal
• Probing and harnessing photonic Fermi arc surface states using light-matter interactions
• Observation of Quadratic (Charge-2) Weyl Point Splitting in Near-Infrared Photonic Crystals