Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detection of pairing correlation in the two-dimensional Hubbard model   Quantum Monte Carlo method is used to re-examine superconductivity in the
single-band Hubbard model in two dimensions. Instead of the conventional
pairing, we consider a `correlated pairing', $\langle \tilde{c}_{i\uparrow}
\tilde{c}_{i'\downarrow} %\tilde{c}_{j'\downarrow}^\dagger \tilde{c}_{j
\uparrow}^\dagger \rangle$ with $\tilde{c}_{i\sigma} \equiv
c_{i\sigma}(1-n_{i-\sigma})$, which is inferred from the $t$-$J$ model, the
strong-coupling limit of the Hubbard model. The pairing in the $d$-wave channel
is found to possess both a divergence like $1/T$ in the pairing susceptibility
and a growth of the ground-state pairing correlation with sample size,
indicating an off-diagonal long-range order near (but not exactly at)
half-filling.

33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
2
The categories of this paper are: math