Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Vortex states in an acoustic Weyl crystal with a topological lattice
  defect   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.

20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas