Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The diverse magneto-optical selection rules in bilayer black phosphorus   The magneto-optical properties of bilayer phosphorene is investigated by the
generalized tight-binding model and the gradient approximation. The vertical
inter-Landau-level transitions, being sensitive to the polarization directions,
are mainly determined by the spatial symmetries of sub-envelope functions on
the distinct sublattices. The anisotropic excitations strongly depend on the
electric and magnetic fields. A perpendicular uniform electric field could
greatly diversify the selection rule, frequency, intensity, number and form of
symmetric absorption peaks. Specifically, the unusual magneto-optical
properties appear beyond the critical field as a result of two subgroups of
Landau levels with the main and side modes. The rich and unique
magneto-absorption spectra arise from the very close relations among the
geometric structures, multiple intralayer and interlayer hopping integrals, and
composite external fields.

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The categories of this paper are: cs
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg