Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic Excitations in Bilayer High-Temperature Superconductors with
  Stripe Correlations   The universal behaviour of the magnetic excitations in high-temperature
superconductors is described in a model with static stripes retaining only the
localized spin degrees of freedom. The stripes are represented by a model of
coupled two-leg spin ladders. We start from the results obtained previously by
continuous unitary transformations for an isolated spin ladder. A quantitative
description of neutron scattering data is reached, using a model for a single
cuprate layer with well established values of the exchange coupling constants.
The neutron resonance peak is explained in terms of a saddle point in the
dispersion of the magnetic excitations. Here we make predictions for bilayer
systems with in-phase or out-of-phase stripe correlations. The results may
serve as a guide for future experimental analyses.

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The categories of this paper are: gr-qc
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin