Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum phase transitions in a spin-1/2 alternating Heisenberg
  antiferromagnetic chain under a staggered transverse magnetic field   The magnetic behaviors of a spin-1/2 alternating Heisenberg antiferromagnetic
chain in a staggered transverse magnetic field is studied by means of the
density-matrix renormalization group method and Jordan-Wigner transformation.
Quantum phase transitions of different types are observed in the S=1 Neel and
XY-like gapless phases, which result from the competitions between the
staggered transverse field and magnetic orders induced by anisotropy and
alternating interactions. The results are compared with the mean-field and some
exactly resolved results.

7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas