Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electromagnetically induced transparency and nonlinear pulse propagation
  in a combined tripod and $\Lambda$ atom-light coupling scheme   We consider propagation of a probe pulse in an atomic medium characterized by
a combined tripod and Lambda ($\Lambda$) atom-light coupling scheme. The scheme
involves three atomic ground states coupled to two excited states by five light
fields. It is demonstrated that dark states can be formed for such an
atom-light coupling. This is essential for formation of the electromagnetically
induced transparency (EIT) and slow light. In the limiting cases the scheme
reduces to conventional $\Lambda$- or $N$-type atom-light couplings providing
the EIT or absorption, respectively. Thus the atomic system can experience a
transition from the EIT to the absorption by changing the amplitudes or phases
of control lasers. Subsequently the scheme is employed to analyze the nonlinear
pulse propagation using the coupled Maxwell-Bloch equations. It is shown that
generation of stable slow light optical solitons is possible in such a
five-level combined tripod and $\Lambda$ atomic system.

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The categories of this paper are: chem-ph
1
The categories of this paper are: cs
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics