Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonequilibrium Lattice Dynamics in Monolayer MoS2   The coupled nonequilibrium dynamics of electrons and phonons in monolayer
MoS2 is investigated by combining first-principles calculations of the
electron-phonon and phonon-phonon interaction with the time-dependent Boltzmann
equation. Strict phase-space constraints in the electron-phonon scattering are
found to influence profoundly the decay path of excited electrons and holes,
restricting the emission of phonons to crystal momenta close to few
high-symmetry points in the Brillouin zone. As a result of momentum selectivity
in the phonon emission, the nonequilibrium lattice dynamics is characterized by
the emergence of a highly-anisotropic population of phonons in reciprocal
space, which persists for up to 10 ps until thermal equilibrium is restored by
phonon-phonon scattering. Achieving control of the nonequilibrium dynamics of
the lattice may provide unexplored opportunities to selectively enhance the
phonon population of two-dimensional crystals and, thereby, transiently tailor
electron-phonon interactions over sub-picosecond time scales.

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The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: nlin
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The categories of this paper are: ao-sci
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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: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas