Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase diagrams, critical and multicritical behavior of hard-core
  Bose-Hubbard models   We determine the zero-temperature phase diagram of the hard-core Bose-Hubbard
model on a square lattice by mean-field theory supplemented by a linear
spin-wave analysis. Due to the interplay between nearest and next-nearest
neighbor interaction and cubic anisotropy several supersolid phases with
checkerboard, stripe domain or intermediate symmetry are stabilized. The phase
diagrams show three different topologies depending on the relative strength of
nearest and next-nearest neighbor interaction. We also find a rich variety of
new quantum critical behavior and multicritical points and discuss the
corresponding effective actions and universality classes.

16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th