Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electromagnetically Induced Transparency in $\Lambda$-systems of
  $^{87}Rb$ atom in magnetic field   The electromagnetically induced transparency (EIT) observations in two
$\Lambda$-systems of $^{87}Rb$ atom, $|5^{2}S_{1/2} F=1\rangle \rightarrow
|5^{2}P_{3/2} F'=1\rangle \leftarrow |5^{2}S_{1/2} F=2\rangle$ and
$|5^{2}S_{1/2} F=1\rangle \rightarrow |5^{2}P_{3/2} F'=2\rangle \leftarrow
|5^{2}S_{1/2} F=2\rangle$, have been investigated in detail and the results are
found consistent with our proposed theoretical models. The second
$\Lambda$-system provides EIT signal with higher magnitude than the first
system, both in absence and in presence of an applied magnetic field. The
observed steeper slope of the EIT signal in presence of the magnetic field can
enable one to achieve tight frequency locking of lasers using these EIT
signals.

23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg