Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Light induced magnetization in a spin S=1 easy-plane antiferromagnetic
  chain   The time evolution of magnetization induced by circularly polarized light in
a $S=1$ Heisenberg chain with large, easy--plane anisotropy is studied
numerically and analytically. Results at constant light frequency
$\Omega=\Omega_0$ are interpreted in terms of absorption lines of the
electronic spin resonance spectrum. Applying a time dependent light frequency
$\Omega=\Omega(t)$, so called chirping, is shown to be an efficient procedure
in order to obtain within a short time a large, controlled value of the
magnetization $M^z$. Furthermore, comparison with a $2$ - level model provides
a qualitative understanding of the induced magnetization process.

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The categories of this paper are: q-bio
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The categories of this paper are: eess
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
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The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas