Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical Spectrum of MoS${}_2$: Many-body Effects and Diversity of
  Exciton States   We present first-principles calculations of the optical response of monolayer
molybdenum disulfide employing the GW-Bethe Salpeter equation (GW-BSE) approach
including self-energy, excitonic, and electron-phonon effects. We show that
monolayer MoS2 possesses a large and diverse number of strongly bound excitonic
states with novel k-space characteristics that were not previously seen
experimentally or theoretically. The absorption spectrum is shown to be
dominated by excitonic states with binding energy close to $1$~eV and by strong
electron-phonon broadening in the visible to ultra-violet range. Our results
explain recent experimental measurements and resolve inconsistencies between
previous GW-BSE calculations.

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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
7
The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci