Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Selective Exciton-Phonon-Phonon Coupling and Anharmonicity with Cavity
  Vibrational Phonons and MoS$_2$ Lattice Phonons in Hybrid Nanobeam Cavities   We report selective coupling between neutral excitons X$^0$, vibrational
phonon modes of a freestanding nanobeam cavity and lattice phonons of a MoS$_2$
monolayer fully encapsulated by hBN. Our experimental findings demonstrate that
the cavity vibrational phonons selectively couple to neutral excitons (X$^0$),
and the coupling to negatively charged trion (X$^-$) being significantly
weaker. We establish this result by studying the lattice temperature induced
broadening of exciton linewidths, where the contribution from the X$^0$-cavity
phonon coupling is clearly observed while the X$^-$-cavity phonon coupling is
not. Furthermore, when the Raman modes of MoS$_2$ lattice phonons A$_{1g}$ and
2LA are tuned into an outgoing resonance with exciton emissions, we observe the
X$^0$-cavity phonon-lattice phonon coupling which inherits the characteristics
rule the of X$^0$-cavity phonon coupling. As a result, X$^0$-induced Raman
scatterings are enhanced, while X$^-$-induced scatterings are suppressed,
revealed by the detuning-dependent Raman intensities and the ratio of
X$^-$/X$^0$ emission intensities. The phonon anharmonicity from the coupling
between cavity vibrational phonons and MoS$_2$ lattice phonons is further
demonstrated by the observed Raman linewidth. Such hybrid couplings between
materials and nanostructures enable the control of phonon-induced processes in
nanophotonic and nanomechanical systems incorporating 2D semiconductors.

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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: physics
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph