Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Real-time control of the periodicity of a standing wave: an optical
  accordion   We report an experimental method to create optical lattices with real-time
control of their periodicity. We demonstrate a continuous change of the lattice
periodicity from 0.96 $\mu$m to 11.2 $\mu$m in one second, while the center
fringe only moves less than 2.7 $\mu$m during the whole process. This provides
a powerful tool for controlling ultracold atoms in optical lattices, where
small spacing is essential for quantum tunneling, and large spacing enables
single-site manipulation and spatially resolved detection.

30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph