Quantitative modeling of gate-tunable cavity exciton-polaritons in transition-metal dichalcogenides*

We present a comprehensive real-space simulation analysis of propagative exciton-polaritons (EPs) of tungsten disulfide (WS2) inside a Fabry–Pérot cavity. The results of our simulations highlight the sensitive dependence between gate voltages and the dispersion relation as well as the propagation length of exciton-polaritons (EPs). We observed peak gating responses in proximity to exciton or trion energy, where electrical gating could enhance or diminish the propagation length of exciton-polaritons (EPs) by a factor of 2 to 3. Additionally, we showcased the potential of gate-tunable exciton-polaritons (EPs) in WS2 by demonstrating their effectiveness in electro-optical modulation applications. Our research reveals the intricate real-space transport properties of gate-tunable cavity exciton-polaritons (EPs) in WS2, laying the foundation for future applications of EPs in nanophotonic devices and circuits.