Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarization of a quasi two-dimensional repulsive Fermi gas with Rashba
  spin-orbit coupling: a variational study   Motivated by the remarkable experimental control of synthetic gauge fields in
ultracold atomic systems, we investigate the effect of an artificial Rashba
spin-orbit coupling on the spin polarization of a two-dimensional repulsive
Fermi gas. By using a variational many-body wavefunction, based on a suitable
spinorial structure, we find that the polarization properties of the system are
indeed controlled by the interplay between spin-orbit coupling and repulsive
interaction. In particular, two main effects are found: 1) The Rashba coupling
determines a gradual increase of the degree of polarization beyond the critical
repulsive interaction strength, at variance with conventional 2D Stoner
instability. 2) The critical interaction strength, above which finite
polarization is developed, shows a dependence on the Rashba coupling, i.e. it
is enhanced in case the Rashba coupling exceeds a critical value. A simple
analytic expression for the critical interaction strength is further derived in
the context of our variational formulation, which allows for a straightforward
and insightful analysis of the present problem.

7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th