Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exact result on the Mott transition in a two-dimensional model of
  strongly correlated electrons   We study the properties of a quarter-filled system of electrons on a square
lattice interacting through a local repulsion $U$ and a nearest-neighbour
repulsion $V$ in the limit $V=+\infty$. We identify the ground-state for $U$
large enough and show that domain walls appear below a critical value
$U_c=4t/\pi$. We argue that this corresponds to a metal-insulator transition
due to Mott localization.

36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int