Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pairing and superconductivity in the flat band: Creutz lattice   We use unbiased numerical methods to study the onset of pair superfluidity in
a system that displays flat bands in the noninteracting regime. This is
achieved by using a known example of flat band systems, namely the Creutz
lattice, where we investigate the role of local attractive interactions in the
$U < 0$ Hubbard model. Going beyond the standard approach used in these systems
where weak interactions are considered, we map the superfluid behavior for a
wide range of interaction strengths and exhibit a crossover between BCS and
tightly bound bosonic fermion pairs. We further contrast these results with a
standard two-leg fermionic ladder, showing that the pair correlations, although
displaying algebraic decay in both cases, are longer ranged in the Creutz
lattice, signifying the robustness of pairing in this system.

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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph