Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonequilibrium plasmon emission drives ultrafast carrier relaxation
  dynamics in photoexcited graphene   The fast decay of carrier inversion in photoexcited graphene has been
attributed to optical phonon emission and Auger recombination. Plasmon emission
provides another pathway that, as we show here, drives the carrier relaxation
dynamics on ultrafast timescales. In studying the nonequilibrium relaxation
dynamics we find that plasmon emission effectively converts inversion into hot
carriers, whose energy is then extracted by optical phonon emission. This
mechanism not only explains the observed fs-lifetime of inversion but also
offers the prospect for atomically thin ultrafast plasmon emitters.

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The categories of this paper are: gr-qc
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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: astro-ph
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The categories of this paper are: funct-an
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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: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
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The categories of this paper are: cs
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The categories of this paper are: math
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The categories of this paper are: physics
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The categories of this paper are: nucl-ex