Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonperturbative Coherent Population Trapping: An Analytic Model   Coherent population trapping is shown to occur in a driven symmetric
double-well potential in the strong-field regime. The system parameters have
been chosen to reproduce the $0^{-}\leftrightarrow 3^{+}$ transition of the
inversion mode of the ammonia molecule. For a molecule initially prepared in
its lower doublet we find that, under certain circumstances, the $3^{+}$ level
remains unpopulated, and this occurs in spite of the fact that the laser field
is resonant with the $0^{-}\leftrightarrow 3^{+}$ transition and intense enough
so as to strongly mix the $0^{+}$ and $0^{-}$ ground states. This
counterintuitive result constitutes a coherent population trapping phenomenon
of nonperturbative origin which cannot be accounted for with the usual models.
We propose an analytic nonperturbative model which accounts correctly for the
observed phenomenon.

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The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
37
The categories of this paper are: supr-con
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The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
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The categories of this paper are: hep-th