Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhanced screening and spectral diversity in many-body elastic
  scattering of excitons in two-dimensional hybrid metal-halide perovskites   In two-dimensional hybrid organic-inorganic metal-halide perovskites, the
intrinsic optical lineshape reflects multiple excitons with distinct binding
energies, each dressed differently by the hybrid lattice. Given this
complexity, a fundamentally far-reaching issue is how Coulomb-mediated
many-body interactions --- elastic scattering such as excitation-induced
dephasing, inelastic exciton bimolecular scattering, and multi-exciton binding
--- depend upon the specific exciton-lattice coupling. We report the intrinsic
and density-dependent exciton pure dephasing rates and their dependence on
temperature by means of a coherent nonlinear spectroscopy. We find
exceptionally strong screening effects on multi-exciton scattering relative to
other two-dimensional single-atomic-layer semiconductors. Importantly, the
exciton-density dependence of the dephasing rates is markedly different for
distinct excitons. These findings establish the consequences of particular
lattice dressing on exciton many-body quantum dynamics, which critically define
fundamental optical properties that underpin photonics and quantum
optoelectronics in relevant exciton density regimes.

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The categories of this paper are: chem-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an