Dispersive coupling between MoSe<sub>2</sub> and an integrated zero-dimensional nanocavity

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Abstract

<jats:p>Establishing a coherent interaction between a material resonance and an optical cavity is a necessary first step to study semiconductor quantum optics. Here we report on the signature of a coherent interaction between a two-dimensional excitonic transition in monolayer MoSe<jats:sub>2</jats:sub> and a zero-dimensional, ultra-low mode volume (<jats:italic>V</jats:italic><jats:sub> <jats:italic>m</jats:italic> </jats:sub> ∼ 2(<jats:italic>λ</jats:italic>/<jats:italic>n</jats:italic>)<jats:sup>3</jats:sup>) on-chip photonic crystal nanocavity. This coherent interaction manifests as a dispersive shift of the cavity transmission spectrum, when the exciton-cavity detuning is decreased via temperature tuning. The exciton-cavity coupling is estimated to be ≈6.5 meV, with a cooperativity of ≈4.0 at 80 K, showing our material system is on the verge of strong coupling. The small mode-volume of the resonator is instrumental in reaching the strongly nonlinear regime, while on-chip cavities will help create a scalable quantum photonic platform.</jats:p>

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