Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum critical transition from charge-ordered to superconducting state
  in the triangular lattice negative-U extended Hubbard model   We demonstrate a robust frustration-driven charge-order to superconductivity
transition in the half-filled negative-U extended Hubbard model.
Superconductivity extends over a broad region of the parameter space. We argue
that the model provides the correct insight to understanding unconventional
superconductivity in the organic charge-transfer solids and other
quarter-filled systems.

27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an