Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase Separation of Superfluids in the Chain of Four-Component Ultracold
  Atoms   We investigate the competition of various exotic superfluid states in a chain
of spin-polarized ultracold fermionic atoms with hyperfine spin $F = 3/2$ and
s-wave contact interactions. We show that the ground state is an exotic
inhomogeneous mixture in which two distinct superfluid phases --- spin-carrying
pairs and singlet quartets --- form alternating domains in an extended region
of the parameter space.

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The categories of this paper are: supr-con
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an