Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interference pattern of Bose-condensed gas in a 2D optical lattice   For the Bose-condensed gas confined in a magnetic trap and in a
two-dimensional optical lattice, the non-uniform distribution of atoms in
different lattice sites is considered based on Gross-Pitaevskii equation. A
propagator method is used to investigate the time evolution of 2D interference
patterns after (i)only the optical lattice is swithed off, and (ii)both the
optical lattice and the magnetic trap are swithed off. An analytical
description on the motion of side peaks in the interference patterns is
presented by using the density distribution in a momentum space.

11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex