Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Asymmetrical interaction induced real spectra and exceptional points in
  a non-Hermitian Hamiltonian   Non-Hermitian systems with parity-time symmetry have been developed rapidly
and hold great promise for future applications. Unlike most existing works
considering the symmetry of the free energy terms (e.g., gain-loss system), in
this paper, we report that a realizable non-Hermitian interaction between two
quantum resonances can also have a real spectrum after the exceptional point.
That phenomenon is similar with that in the gain-loss system so that the
non-Hermitian interaction can be an excellent substitute for quantum gain. Such
a non-Hermitian interaction can be realized in designed optomechanics, and we
find that its dynamics are in accordance with those of normal gain system as
expected. As examples, the phase transition near the exceptional point and the
induced chaos in weak nonlinear coupling are shown and analyzed for an
intuitive visual. Our results provide a platform for realizing parity-time
symmetry devices and studying properties of non-Hermitian quantum mechanics.

4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc