Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological States in a One-Dimensional Fermi Gas with Attractive
  Interactions   We describe a novel topological superfluid state, which forms in a
one-dimensional Fermi gas with Rashba-like spin-orbit coupling, a Zeeman field
and intrinsic attractive interactions. In spite of total number conservation
and the presence of gapless excitations, Majorana-like zero modes appear in
this system and can be linked with interfaces between two distinct phases that
naturally form at different regions of the harmonic trap. As a result, the low
lying collective excitations of the system, including the dipole oscillations
and the long-wavelength phonons, are doubly degenerate. While backscattering
from point impurities can lead to a splitting of the degeneracies that scales
algebraically with the system size, the smooth confining potential can only
cause an exponentially small splitting. We show that the topological state can
be uniquely probed by a pumping effect induced by a slow sweep of the Zeeman
field from a high initial value down to zero field.

5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat