Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ground-state thermodynamic quantities of homogeneous spin-$1/2$ fermions
  from the BCS region to the unitarity limit   We experimentally determined various thermodynamic quantities of interacting
two-component fermions at the zero-temperature limit from the
Bardeen-Cooper-Schrieffer (BCS) region to the unitarity limit. The obtained
results are very accurate in the sense that the systematic error is within 4%
around the unitarity limit. Using this advantage, we can compare our data with
various many-body theories. We found that an extended ${\it T}$-matrix
approximation, which is a strong-coupling theory involving fluctuations in the
Cooper channel, well reproduces our experimental results. We also found that
the superfluid order parameter ${\it \Delta}$ calculated by solving the
ordinary BCS gap equation with the chemical potential of interacting fermions
is close to the binding energy of the paired fermions directly observed in a
spectroscopic experiment and that obtained using a quantum Monte Carlo method.
Since understanding the strong-coupling properties of a superfluid Fermi gas in
the BCS-BEC (Bose-Einstein condensation) crossover region is a crucial issue in
condensed matter physics and nuclear physics, the results of the present study
are expected to be useful in the further development of these fields.

25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
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The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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The categories of this paper are: stat