Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Insulating charge density wave for a half-filled SU(N) Hubbard model
  with an attractive on-site interaction in one dimension   We study a one-dimensional SU(N) Hubbard model with an attractive on-site
interaction and $N>2$ at half-filling on the bipartite lattice using
density-matrix renormalization-group method and a perturbation theory. We find
that the ground state of the SU(N) Hubbard model is a charge density wave state
with two-fold degeneracy. All the excitations are found to be gapful, resulting
in an insulating ground state, on contrary to that in the SU(2) case. Moreover,
the charge gap is equal to the Cooperon gap, which behaves as $-2Nt^2/(N-1)U$
in the strong coupling regime. However, the spin gap $\Delta_{s}$ and the
quasiparticle gap $\Delta_{1}$ as well open exponentially in the weak coupling
region, while in the strong coupling region, they linearly depend on $U$ such
that $\Delta_{s}\sim -U(N-1)$ and $\Delta_{1}\sim -U(N-1)/2$.

29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin