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

Qiang Wang, Yong Ge, Hong-xiang Sun, Haoran Xue, Ding Jia, Yi-jun Guan, Shou-qi Yuan (), Baile Zhang () and Y. D. Chong ()
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Qiang Wang: Nanyang Technological University
Yong Ge: Jiangsu University
Hong-xiang Sun: Jiangsu University
Haoran Xue: Nanyang Technological University
Ding Jia: Jiangsu University
Yi-jun Guan: Jiangsu University
Shou-qi Yuan: Jiangsu University
Baile Zhang: Nanyang Technological University
Y. D. Chong: Nanyang Technological University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Crystalline materials can host topological lattice defects that are robust against local deformations, and such defects can interact in interesting ways with the topological features of the underlying band structure. 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.

Date: 2021
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DOI: 10.1038/s41467-021-23963-7

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