Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of anti-PT symmetry phase transition in the
  magnon-cavity-magnon coupled system   As the counterpart of PT symmetry, abundant phenomena and potential
applications of anti-PT symmetry have been predicted or demonstrated
theoretically. However, experimental realization of the coupling required in
the anti-PT symmetry is difficult. Here, by coupling two YIG spheres to a
microwave cavity, the large cavity dissipation rate makes the magnons coupled
dissipatively with each other, thereby obeying a two-dimensional anti-PT
Hamiltonian. In terms of the magnon-readout method, a new method adopted here,
we demonstrate the validity of our method in constructing an anti-PT system and
present the counterintuitive level attraction process. Our work provides a new
platform to explore the anti-PT symmetry properties and paves the way to study
multi-magnoncavity-polariton systems.

33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int