Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Excitation of the Higgs Mode in a Superfluid Fermi Gas in the BCS-BEC
  Crossover   In quantum many-body systems with spontaneous breaking of continuous
symmetries, Higgs modes emerge as collective amplitude oscillations of order
parameters. Recently, Higgs mode has been observed in the ultracold Fermi gas.
In the present paper, we use the time-dependent Bogoliubov-de Gennes equations
to investigate Higgs amplitude oscillations of the superfluid order parameter
in a Fermi gas induced by a rapid change of the ${\it s}$-wave scattering
length. In particular, we investigate the Higgs mode with different values of
the initial scattering length. We find that the energy of the Higgs mode
coincides with the threshold energy of the pair-breaking excitation, and
exponent of the power-low decay of the Higgs mode $\gamma$ continuously changes
between $\gamma=-1/2$ and $\gamma=-3/2$ through the
Bardeen-Cooper-Schrieffer-Bose-Einstein condensation (BCS-BEC) crossover.
Moreover, we propose the optimal ramp speed of the scattering length for
observing the clearest Higgs oscillations.

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The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org