Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bloch oscillations: atom optical interpretation, realizations, and
  applications   The cyclic motion of particles in a periodic potential under the influence of
a constant external force is analyzed in an atom optical approach based on
Landau-Zener transitions between two resonant states. The resulting complex
picture of population transfers can be interpreted in an intuitive diagrammatic
way. The model is also applied to genuine atom optical systems and its
applicability is discussed.

28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph