Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Valley Coherent Hot Carriers and Thermal Relaxation in Monolayer
  Transition Metal Dichalcogenides   We show room temperature valley coherence with in MoS2, MoSe2, WS2 and WSe2
monolayers using linear polarization resolved hot photoluminescence (PL), at
energies close to the excitation - demonstrating preservation of valley
coherence before sufficient scattering events. The features of the co-polarized
hot luminescence allow us to extract the lower bound of the binding energy of
the A exciton in monolayer MoS2 as 0.42 (+/- 0.02) eV. The broadening of the PL
peak is found to be dominated by Boltzmann-type hot luminescence tail, and
using the slope of the exponential decay, the carrier temperature is extracted
in-situ at different stages of energy relaxation. The temperature of the
emitted optical phonons during the relaxation process are probed by exploiting
the corresponding broadening of the Raman peaks due to temperature induced
anharmonic effects. The findings provide a physical picture of photo-generation
of valley coherent hot carriers, and their subsequent energy relaxation path
ways.

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The categories of this paper are: hep-ph
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: math
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: comp-gas