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Integrating two-dimensional van der Waals materials with optical cavities hasrevealed a fascinating platform to study exciton-polariton physics.Manipulating exciton polaritons often requires external control over theelectrical and optical properties of materials. Here we demonstrate theelectrical control of 2D exciton polaritons by strongly coupling a transitionmetal dichalcogenides (TMD) heterostructure to a photonic crystal nanocavity.Through precise control of the doping level in the TMD monolayers usingelectrostatic gating, we demonstrate a wide range of tunability in the excitonoscillator strength and hence the exciton photon hybridization. This tunabilityleads to the demonstration of a continuous transition from weak to strongcoupling regime, as manifested by the disappearance and emergence of excitonpolaritons, showcasing the versatility of our approach. Our work paves the wayto further exploring nonlinear and quantum exciton polaritons in 2D materialsand their device applications.

Control over cavity exciton polaritons in monolayer semiconductors