Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Monodromy in Dicke superradiance   We study the focus-focus type of monodromy in an integrable version of the
Dicke model. Classical orbits forming a pinched torus represent analogues of
the dynamic superradiance under conditions of a closed system. Quantum
signatures of monodromy appear in lattices of expectation values of various
quantities in the Hamiltonian eigenstates and are related to an excited-state
quantum phase transition. We demonstrate the breakdown of these structures with
an increasing strength of non-integrable perturbation.

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The categories of this paper are: hep-th
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th