Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Hermitian anisotropic XY model with intrinsic rotation-time reversal
  symmetry   We systematically study the non-Hermitian version of the one-dimensional
anisotropic XY model, which in its original form, is a unique exactly solvable
quantum spin model for understanding the quantum phase transition. The
distinguishing features of this model are that it has full real spectrum if all
the eigenvectors are intrinsic rotation-time reversal (RT) symmetric rather
than parity-time reversal (PT) symmetric, and that its Hermitian counterpart is
shown approximately to be an experimentally accessible system, an isotropic XY
spin chain with nearest neighbor coupling. Based on the exact solution,
exceptional points which separated the unbroken and broken symmetry regions are
obtained and lie on a hyperbola in the thermodynamic limit. It provides a nice
paradigm to elucidate the complex quantum mechanics theory for a quantum spin
system.

21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
18
The categories of this paper are: econ