Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ground-state phase diagram of the one-dimensional Hubbard-model with an
  alternating potential   We investigate the ground-state phase diagram of the one-dimensional
half-filled Hubbard model with an alternating potential--a model for the
charge-transfer organic materials and the ferroelectric perovskites. We
numerically determine the global phase diagram of this model using the
level-crossing and the phenomenological renormalization-group methods based on
the exact diagonalization calculations. Our results support the mechanism of
the double phase transitions between Mott and a band insulators pointed out by
Fabrizio, Gogolin, and Nersesyan [Phys. Rev. Lett. 83, 2014 (1999)]: We confirm
the existence of the spontaneously dimerized phase as an intermediate state.
Further we provide numerical evidences to check the criticalities on the phase
boundaries. Especially, we perform the finite-size-scaling analysis of the
excitation gap to show the two-dimensional Ising transition in the charge part.
On the other hand, we confirm that the dimerized phase survives in the
strong-coupling limit, which is one of the resultants of competition between
the ionicity and correlation effects.

17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin