Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Bose-Einstein condensate in an optical lattice with tunable spacing:
  transport and static properties   In this Letter we report the investigation of transport and static properties
of a Bose-Einstein condensate in a large-spaced optical lattice. The lattice
spacing can be easily tuned starting from few micrometers by adjusting the
relative angle of two partially reflective mirrors. We have performed in-situ
imaging of the atoms trapped in the potential wells of a 20 micrometers-spaced
lattice. For a lattice spacing of 10 micrometers we have studied the transport
properties of the system and the interference pattern after expansion,
evidencing quite different results with respect to the physics of BECs in
ordinary near-infrared standing wave lattices, owing to the different length
and energy scales.

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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph