Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pseudospins and topological effects of phonons in a Kekule lattice   The search for exotic topological effects of phonons has attracted enormous
interest for both fundamental science and practical applications. By studying
phonons in a Kekul\'e lattice, we find a new type of pseudospins characterized
by quantized Berry phases and pseudoangular momenta, which introduces various
novel topological effects, including topologically protected
pseudospin-polarized interface states and a phonon pseudospin Hall effect. We
further demonstrate a pseudospin-contrasting optical selection rule and a
pseudospin Zeeman effect, giving a complete generation-manipulation-detection
paradigm of the phonon pseudospin. The pseudospin and topology-related physics
revealed for phonons is general and applicable for electrons, photons and other
particles.

32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys