Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long-living Bloch oscillations of matter waves in optical lattices   It is shown that by properly designing the spatial dependence of the
nonlinearity it is possible to induce long-living Bloch oscillations of a
localized wavepacket in a periodic potential. The results are supported both by
analytical and numerical investigations and are interpreted in terms of matter
wave dynamics displaying dozens of oscillation periods without any visible
distortion of the wave packet.

10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph