Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superlight pairs in face-centred-cubic extended Hubbard models with
  strong Coulomb repulsion   The majority of fulleride superconductors with unusually high
transition-temperature to kinetic-energy ratios have a face-centred-cubic (FCC)
structure. We demonstrate that, within extended Hubbard models with strong
Coulomb repulsion, paired fermions in FCC lattices have qualitatively different
properties than pairs in other three-dimensional cubic lattices. Our results
show that strongly bound, light, and small pairs can be generated in FCC
lattices across a wide range of the parameter space. We estimate that such
pairs can Bose condense at high temperatures even if the lattice constant is
large (as in the fullerides).

14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess