Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Half-Vortex Unbinding and Ising Transition in Constrained Superfluids   We analyze the thermodynamics of the atomic and (nematic) pair superfluids
appearing in the attractive two-dimensional Bose-Hubbard model with a
three-body hard-core constraint that has been derived as an effective model for
cold atoms subject to strong three-body losses in optical lattices. We show
that the thermal disintegration of the pair superfluidity is governed by the
proliferation of fractional half-vortices leading to a
Berezinskii-Kosterlitz-Thousless transition with unusual jump in the helicity
modulus. In addition to the (conventional) Berezinskii-Kosterlitz-Thousless
transition out of the atomic superfluid, we furthermore identify a direct
thermal phase transition separating the pair and the atomic superfluid phases,
and show that this transition is continuous with critical scaling exponents
consistent with those of the two-dimensional Ising universality class. We
exhibit a direct connection between the partial loss of quasi long-range order
at the Ising transition between the two superfluids and the parity selection in
the atomic winding number fluctuations that distinguish the atomic from the
pair superfluid.

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The categories of this paper are: eess
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The categories of this paper are: physics
27
The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys