Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fermi excitations in a trapped atomic Fermi gas with a molecular Bose
  condensate   We discuss the effect of a molecular Bose condensate on the energy of Fermi
excitations in a trapped two-component atomic Fermi gas. The single-particle
Green's functions can be approximated by the well-known BCS form, in both the
BCS (Cooper pairs) and BEC (Feshbach resonance molecules) domains. The
composite Bose order parameter ${\tilde
  \Delta}$ describing bound states of two atoms and the Fermi chemical
potential $\mu$ are calculated self-consistently. In the BEC regime
characterized by $\mu<0$, the Fermi quasiparticle energy gap is given by
$\sqrt{\mu^2+{\tilde \Delta}^2}$, instead of $|{\tilde \Delta}|$ in the BCS
region, where $\mu>0$. This shows up in the characteristic energy of atoms from
dissociated molecules.

24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs