Strong exciton-photon coupling offers an effective path for polariton-mediated long-distance coherent energy transfer (ET) between excitonic states. Here, we demonstrate strong coupling between excitons in ${\mathrm{WS}}_2$ monolayers, ${\mathrm{MoS}}_2$ bilayer, and photons in a tunable optical microcavity at room temperature. Full quantum dynamics simulations based on experimental parameters show that the demonstrated system provides an efficient and adjustable platform for ultrafast polariton-assisted ET between the excitons in two-dimensional materials when the separation between them exceeds $1\mathrm{\mu }\mathrm{m}$.

• Received 5 January 2024
• Revised 9 April 2024
• Accepted 11 April 2024

DOI:https://doi.org/10.1103/PhysRevB.109.195409