Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collective modes of spin-orbit coupled Fermi gases in the repulsive
  regime   We investigate the collective modes in the spin-orbit coupled Fermi gas with
repulsive s-wave interaction. The interplay between spin-orbit coupling and
atom-atom interactions plays the crucial role in the collective behaviors of
Fermi gas. In contrast with ordinary Fermi liquid, spin-orbit coupled Fermi gas
has strongly correlated spin and density excitations. Within the scheme of
random phase approximation, we classify collective modes based on the symmetry
group and determine their properties via the poles of corresponding correlation
functions. Besides, the particle-hole continuum is obtained, where the
imaginary part of these correlation functions become non-vanishing. We make
comparisons with collective excitations in the ordinary Fermi liquid without
spin-orbit coupling and in a helical liquid, i.e., surface states of a three
dimensional topological insulator. We also propose an experimental protocol for
detecting these collective modes and discuss corresponding experimental
signatures in the ultracold Fermi gases experiment.

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The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn