Vortex states in an acoustic Weyl crystal with a topological lattice defect

Abstract

We design and implement a three dimensional acoustic Weyl metamaterial hosting robust modes bound to a one-dimensional topological lattice defect. The modes are related to topological features of the bulk bands, and carry nonzero orbital angular momentum locked to the direction of propagation. They span a range of axial wavenumbers defined by the projections of two bulk Weyl points to a one-dimensional subspace, in a manner analogous to the formation of Fermi arc surface states. We use acoustic experiments to probe their dispersion relation, orbital angular momentum locked waveguiding, and ability to emit acoustic vortices into free space. These results point to new possibilities for creating and exploiting topological modes in three-dimensional structures through the interplay between band topology in momentum space and topological lattice defects in real space.

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Cited by in corpus (13)

• Topological acoustics
• Topological photonic crystals: physics, designs and applications
• Topological dislocation modes in three-dimensional acoustic topological insulators
• Observation of degenerate zero-energy topological states at disclinations in an acoustic lattice
• Observation of nonlinear disclination states
• Topologically protected vortex transport via chiral-symmetric disclination
• Nonlinear photonic disclination states
• Quasicrystalline second-order topological semimetals
• Symmetry-driven Phononic Metamaterials
• Observation of dislocation-induced topological modes in a three-dimensional acoustic topological insulator
• Thresholdless corner vortex solitons in fractal Sierpiński topological insulators
• Topological photonic crystal fibre
• Research on topological materials using ultrafast spectroscopy