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We theoretically demonstrate the coupling between excitons in 2Dsemiconductors and surface plasmons in a thin metal film by means of a surfaceacoustic wave (SAW), proving that the generated exciton-plasmon polaritons (orplexcitons) are in the strong coupling regime. The strain field of the SAWcreates a dynamic diffraction grating providing the momentum match for thesurface plasmons, whereas the piezoelectric field, that could dissociate theexcitons, is cancelled out by the metal. This is exemplified for monolayerMoS$\mathrm{_{2}}$ and mono- and few-layer black phosphorus on top of a thinsilver layer on a LiNbO$\mathrm{_{3}}$ piezoelectric substrate, providing Rabisplittings of 100-150 meV. Thus, we demonstrate that SAWs are powerful tools tomodulate the optical properties of supported 2D semiconductors by means of thehigh-frequency localized deformations tailored by the acoustic transducers,that can serve as electrically switchable launchers of propagating plexcitonssuitable for active high-speed nanophotonic applications.

Exciton-Plasmon Coupling in 2D Semiconductors by Surface Acoustic Waves