Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultrafast Dynamics of Defect-Assisted Electron-Hole Recombination in
  Monolayer MoS2   In this letter, we present non-degenerate ultrafast optical pump-probe
studies of the carrier recombination dynamics in MoS$_{2}$ monolayers. By
tuning the probe to wavelengths much longer than the exciton line, we make the
probe transmission sensitive to the total population of photoexcited electrons
and holes. Our measurement reveals two distinct time scales over which the
photoexcited electrons and holes recombine; a fast time scale that lasts
$\sim$2 ps and a slow time scale that lasts longer than $\sim$100 ps. The
temperature and the pump fluence dependence of the observed carrier dynamics
are consistent with defect-assisted recombination as being the dominant
mechanism for electron-hole recombination in which the electrons and holes are
captured by defects via Auger processes. Strong Coulomb interactions in two
dimensional atomic materials, together with strong electron and hole
correlations in two dimensional metal dichalcogenides, make Auger processes
particularly effective for carrier capture by defects. We present a model for
carrier recombination dynamics that quantitatively explains all features of our
data for different temperatures and pump fluences. The theoretical estimates
for the rate constants for Auger carrier capture are in good agreement with the
experimentally determined values. Our results underscore the important role
played by Auger processes in two dimensional atomic materials.

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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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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: gr-qc
0
The categories of this paper are: hep-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: q-bio