Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Zone folding induced topological insulators in phononic crystals   This letter investigates a flow-free, pseudospin-based acoustic topological
insulator. Zone folding, a strategy originated from photonic crystal, is used
to form double Dirac cones in phononic crystal. The lattice symmetry of the
phononic crystal is broken by tuning the size of the center "atom" of the unit
cell in order to open the nontrivial topological gap. Robust sound one-way
propagation is demonstrated both numerically and experimentally. This study
provides a flexible approach for realizing acoustic topological insulators,
which are promising for applications such as noise control and waveguide
design.

22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int