Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Field theory of low energy excitations of a mixture of two species of
  pseudospin-1/2 Bose gases with interspecies spin-exchange   We develop a low energy effective field theory of a mixture of two species of
pseudospin-1/2 atoms with interspecies spin-exchange, in addition to
density-density interaction. This approach is beyond the single orbital-mode
approximation. In a wide parameter regime, it indicates the existence of the
four elementary excitations, especially a gapped mode due to interspecies
spin-exchange. On the other hand, the spectrum of the effective spin
Hamiltonian yielded by the single mode approximation can be obtained by
quantizing the homogeneous excitation, which is spin excitation and is the
long-wavelength limit of the gapped mode of elementary excitations. These low
energy excitations can be experimentally measured by using Bragg spectroscopy.

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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
1
The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: adap-org
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The categories of this paper are: stat
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc