Phonon signatures in spectra of exciton polaritons in transition metal dichalcogenides

Abstract

Embedding a monolayer of a transition metal dichalcogenide in a high-Q optical cavity results in the formation of distinct exciton polariton modes. The polaritons are affected by the strong exciton-phonon interaction in the monolayer. We use a time convolutionless master equation to calculate the phonon influence on the spectra of the polaritons. We discuss the non-trivial dependence of the line shapes of both branches on temperature and detuning. The peculiar polariton dispersion relation results in a linewidth of the lower polariton being largely independent of the coupling to acoustic phonons. For the upper polariton, acoustic phonons lead to a low-energy shoulder of the resonance in the linear response. Furthermore, we analyze the influence of inhomogeneous broadening being the dominant contribution to the lower polariton linewidth at low temperatures. Our results point towards interesting phonon features in polariton spectra in transition metal dichalcogenides.

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Cited by in corpus (11)

• Exciton optics, dynamics and transport in atomically thin semiconductors
• Twist Angle Tuning of Moiré Exciton Polaritons in van der Waals Heterostructures
• Enhancing ground state population and macroscopic coherence of room-temperature WS${}_2$ polaritons through engineered confinement
• Microscopic modelling of exciton-polariton diffusion coefficients in atomically thin semiconductors
• Circumventing the polariton bottleneck via dark excitons in 2D semiconductors
• Flexural deformations and collapse of bilayer two-dimensional crystals by interlayer exciton
• Signatures of dark excitons in exciton-polariton optics of transition metal dichalcogenides
• Thermal effect on magnetoexciton energy spectra in monolayer transition metal dichalcogenides
• Polariton transport in 2D semiconductors: Phonon-mediated transitions between ballistic, superdiffusive and exciton-limited regimes
• Theory of phonon sidebands in the absorption spectra of moiré exciton-polaritons
• Suppression and amplification of phonon sidebands in transition metal dichalcogenides by optical feedback