Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum phase transition in the one-dimensional extended Peierls-Hubbard
  model   We consider the one-dimensional extended Hubbard model in the presence of an
explicit dimerization $\delta$. For a sufficiently strong nearest neighbour
repulsion we establish the existence of a quantum phase transition between a
mixed bond-order wave and charge-density wave phase from a pure bond-order wave
phase. This phase transition is in the universality class of the
two-dimensional Ising model.

26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
1
The categories of this paper are: cs