Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mutually attracting spin waves in the square-lattice quantum
  antiferromagnet   The Heisenberg model for S=1/2 describes the interacting spins of electrons
localized on lattice sites due to strong repulsion. It is the simplest
strong-coupling model in condensed matter physics with wide-spread
applications. Its relevance has been boosted further by the discovery of curate
high-temperature superconductors. In leading order, their undoped parent
compounds realize the Heisenberg model on square-lattices. Much is known about
the model, but mostly at small wave vectors, i.e., for long-range processes,
where the physics is governed by spin waves (magnons), the Goldstone bosons of
the long-range ordered antiferromagnetic phase. Much less, however, is known
for short-range processes, i.e., at large wave vectors. Yet these processes are
decisive for understanding high-temperature superconductivity. Recent reports
suggest that one has to resort to qualitatively different fractional
excitations, spinons. By contrast, we present a comprehensive picture in terms
of dressed magnons with strong mutual attraction on short length scales. The
resulting spectral signatures agree strikingly with experimental data

30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas