Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quasi-particle interactions in frustrated Heisenberg chains   Interactions between elementary excitations in quasi-one dimensional
antiferromagnets are of experimental relevance and their quantitative
theoretical treatment has been a theoretical challenge for many years. Using
matrix product states, one can explicitly determine the wavefunctions of the
one- and two-particle excitations, and, consequently, the contributions to
dynamical correlations. We apply this framework to the (non integrable)
frustrated dimerized spin-1/2 chain, a model for generic spin-Peierls systems,
where low-energy quasi-particle excitations are bound states of topological
solitons. The spin structure factor involving two quasi-particle scattering
states is obtained in the thermodynamic limit with full momentum and frequency
resolution. This allows very subtle features in the two-particle spectral
function to be revealed which, we argue, could be seen, e.g., in inelastic
neutron scattering of spin-Peierls compounds under a change of the external
pressure.

18
The categories of this paper are: econ
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an