Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase Diagram of the spin S=1/2 Extended XY model   The quantum phase transition in the ground state of the Extended spin S=1/2
XY model is studied in detail. Using the exact solution of the model the low
temperature thermodynamics, as well as the ground state phase diagram of the
model in the presence of applied uniform and/or staggered magnetic field are
discussed.

32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex