Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Incompressible excitonic superfluid of ultracold Bose atoms in an
  optical lattice: a new superfluid phase in the one-component Bose-Hubbard
  model   We predict that a new superfluid phase, the incompressible excitonic
superfluid (IESF), in the phase diagram of ultracold Bose atoms in $d>1$
dimensional optical lattices, which is caused by the spontaneous breaking of
the symmetry of translation of the lattice. Within mean field theory, the
critical temperature of the phase transition from this IESF to the normal fluid
(NF) is calculated and the triple-critical point of the three phases is
determined. We also investigate both configuration and gauge field fluctuations
and show the IESF state is stable against these fluctuations. We expect this
IESF phase can be experimentally observed by loading cold Bose atoms into a
two-dimensional lattice where the atom filling fraction deviates slightly from
exact commensurations. The signatures distinguishing this IESF from the common
atom superfluid (ASF) are that (i) the critical temperature of the IEST/NF
transition is independent of interaction, unlike the ASF/NF transition; (ii)
the IESF is incompressible while the ASF is compressible.

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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
2
The categories of this paper are: math
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
1
The categories of this paper are: cs
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The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys