Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intermediate-Coupling Theory for the Spectral Weight of Spin Polaron   Within the intermediate-coupling theory, the quasiparticle weight $Z$ of one
hole injected in the undoped antiferromagnetic ground state is studied. We find
that, for the hole located at the quasiparticle band minimun with momentum
${\bf k}_0 = (\pm \frac{\pi}{2}, \pm \frac{\pi}{2})$, $Z$ is finite. By
comparing the results obtained by the self-consistent Born approximation, we
show that the intermediate-coupling theory for $Z$ is appropriate only when
$J/t \stackrel{>}{\sim} 1.6$. Finally, the reason why this approach fails in
the small-$J$ case will also be clarified.

9
The categories of this paper are: nlin
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph