Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of spin-orbit interaction on the excitonic effects in
  single-layer, double-layer, and bulk MoS2   We present converged ab-initio calculations of the optical absorption spectra
of single-layer, bi-layer, and bulk MoS$_2$. Both the quasiparticle-energy
calculations (on the level of the GW approximation) and the calculation of the
absorption spectra (on the level of the Bethe-Salpeter equation) explicitly
include spin-orbit coupling, using the full spinorial Kohn-Sham wave-functions
as input. Without excitonic effects, the absorption spectra would have the form
of a step-function, corresponding to the joint-density of states of a parabolic
band-dispersion in 2D. This profile is deformed by a pronounced bound excitonic
peak below the continuum onset. The peak is split by spin-orbit interaction in
the case of single-layer and (mostly) by inter-layer interaction in the case of
double-layer and bulk MoS$_2$. The resulting absorption spectra are thus very
similar in the three cases but the interpretation of the spectra is different.
Differences in the spectra can be seen around 3 eV where the spectra of single
and double-layer are dominated by a strongly bound exciton.

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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci