Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-polariton bound states in the Jaynes-Cummings-Hubbard model   We examine the eigenstates of the one-dimensional Jaynes-Cummings-Hubbard
(JCH) model in the two-excitation subspace. We discover that two-excitation
bound states emerge when the ratio of vacuum Rabi frequency to the tunneling
rate between cavities exceeds a critical value. We determine the critical ratio
as a function of the quasi-momentum quantum number, and indicate that the bound
states carry a strong correlation in which the two polaritons appear to be
spatially confined together.

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The categories of this paper are: hep-ph
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The categories of this paper are: cs
12
The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: cond-mat
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The categories of this paper are: plasm-ph
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga