Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Trap split with Laguerre-Gaussian beams   The optical trapping techniques have been extensively used in physics,
biophysics, micro-chemistry, and micro-mechanics to allow trapping and
manipulation of materials ranging from particles, cells, biological substances,
and polymers to DNA and RNA molecules. In this Letter, we present a convenient
and effective way to generate a novel phenomenon of trapping, named trap split,
in a conventional four-level double-\Lambda atomic system driven by four
femtosecond Laguerre-Gaussian laser pulses. We find that trap split can be
always achieved when atoms are trapped by such laser pulses, as compared to
Gaussian ones. This work would greatly facilitate the trapping and manipulating
the particles and generation of trap split. It may also suggest the possibility
of extension into new research fields, such as micro-machining and biophysics.

33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con