Coupling of MoS${}_2$ Excitons with Lattice Phonons and Cavity Vibrational Phonons in Hybrid Nanobeam Cavities

Abstract

We report resonant Raman spectroscopy of neutral excitons X${}^0$ and intravalley trions X${}^{-}$ in hBN-encapsulated MoS${}_2$ monolayer embedded in a nanobeam cavity. By temperature tuning the detuning between Raman modes of MoS${}_2$ lattice phonons and X${}^0$/X${}^{-}$ emission peaks, we probe the mutual coupling of excitons, lattice phonons and cavity vibrational phonons. We observe an enhancement of X${}^0$-induced Raman scattering and a suppression for X${}^{-}$-induced, and explain our findings as arising from the tripartite exciton-phonon-phonon coupling. The cavity vibrational phonons provide intermediate replica states of X${}^0$ for resonance conditions in the scattering of lattice phonons, thus enhancing the Raman intensity. In contrast, the tripartite coupling involving X${}^{-}$ is found to be much weaker, an observation explained by the geometry-dependent polarity of the electron and hole deformation potentials. Our results indicate that phononic hybridization between lattice and nanomechanical modes plays a key role in the excitonic photophysics and light-matter interaction in 2D-material nanophotonic systems.

References in corpus (12)

• Valley Phonons and Exciton Complexes in a Monolayer Semiconductor
• High quality-factor mechanical resonators based on WSe2 monolayers
• Quantum dot opto-mechanics in a fully self-assembled nanowire
• Unveiling the Zero-Phonon Line of the Boron Vacancy Center by Cavity Enhanced Emission
• Tunable exciton-optomechanical coupling in suspended monolayer MoSe2
• Phonoritons in a monolayer hBN optical cavity
• Fundamental exciton linewidth broadening in monolayer transition metal dichalcogenides
• Phonon-assisted exciton and trion conversion efficiency in transition metal Dichalcogenides
• Trions in MoS${}_2$ are quantum superpositions of intra- and intervalley spin states
• Nonlocal Exciton-Photon Interactions in Hybrid High-Q Beam Nanocavities with Encapsulated MoS${}_2$ Monolayers
• Hot Polarons with Trapped Excitons and Octahedra-Twist Phonons in CH3NH3PbBr3 Hybrid Perovskite Nanowires
• Many-Body Effect of Mesoscopic Localized States in MoS${}_2$ Monolayer

Cited by in corpus (4)

• Lasing of Moiré Trapped MoSe${}_2$/WSe${}_2$ Interlayer Excitons Coupled to a Nanocavity
• Thickness Insensitive Nanocavities for 2D Heterostructures using Photonic Molecules
• Probing Dark Excitons in Monolayer MoS${}_2$ by NonLinear Two-Photon Spectroscopy
• Full Polarization Control of Photons with Evanescent Wave Coupling in the Ultra Subwavelength Gap of Photonic Molecules