Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Correlated versus Ferromagnetic State in Repulsively Interacting
  Two-Component Fermi Gases   Whether a spin-1/2 Fermi gas will become ferromagnetic as the strength of
repulsive interaction increases is a long-standing controversial issue.
Recently this problem is studied experimentally by Jo et al, Science, 325, 1521
(2009) in which the authors claim a ferromagnetic transition is observed. This
work is to point out the results of this experiment can not distinguish whether
the system is in a ferromagnetic state or in a non-magnetic but strongly
short-range correlated state. A conclusive experimental demonstration of
ferromagnetism relies on the observation of ferromagnetic domains.

21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
19
The categories of this paper are: eess