Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extracting the Chern number from the dynamics of a Fermi gas:
  Implementing a quantum Hall bar for cold atoms   We propose a scheme to measure the quantized Hall conductivity of an
ultracold Fermi gas initially prepared in a topological (Chern) insulating
phase, and driven by a constant force. We show that the time evolution of the
center of mass, after releasing the cloud, provides a direct and clear
signature of the topologically invariant Chern number. We discuss the validity
of this scheme, highlighting the importance of driving the system with a
sufficiently strong force to displace the cloud over measurable distances while
avoiding band-mixing effects. The unusual shapes of the driven atomic cloud are
qualitatively discussed in terms of a semi-classical approach.

28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
16
The categories of this paper are: stat
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas