Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long tailed trions in monolayer MoS$_2$: Temperature dependent asymmetry
  and red-shift of trion photoluminescence spectra   Monolayer molybdenum disulfide (MoS$_2$) has emerged as an excellent 2D model
system because of its two inequivalent, direct-gap valleys that lead to exotic
bound and excited states. Here we focus on one such bound state, the negatively
charged trion. Unlike excitons, trions can radiatively decay with non-zero
momentum by kicking out an electron, resulting in an asymmetric trion
photoluminescence (PL) peak with a long low-energy tail. As a consequence, the
peak position does not correspond to the zero momentum trion energy. By
including the trion's long tail in our analysis we are able to accurately
separate the exciton from the trion contributions to the PL spectra. According
to theory, the asymmetric energy tail has both a size-dependent and a
temperature-dependent contribution. Analysis of the temperature-dependent data
reveals the effective trion size, consistent with literature, and the
temperature dependence of the band gap and spin-orbit splitting of the valence
band. Finally, we observe signatures of Pauli-blocking of the trion decay.

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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: math
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The categories of this paper are: astro-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: cs