Fig. 1: Three-level scheme.
From: Intercavity polariton slows down dynamics in strongly coupled cavities
a Generic three-level scheme (in a Λ configuration): A \(\left\vert \gamma \right\rangle\) state couples directly to an intermediate state \(\left\vert e\right\rangle\). On resonance, the coupling between \(\left\vert e\right\rangle\) and a third state \(\left\vert c\right\rangle\) gives rise to a hybrid state \(\left\vert D\right\rangle\) with vanishing contribution from the intermediate state \(\left\vert e\right\rangle .\) Here, ϕ represents the mixing angle between \(\left\vert \gamma \right\rangle\) and \(\left\vert c\right\rangle\). b Representation of the hybrid photonic-polaritonic coupled system. Here, \(\left\vert \gamma \right\rangle=\left\vert {\omega }_{c}^{L}\right\rangle\), \(\left\vert e\right\rangle=\left\vert {\omega }_{c}^{R}\right\rangle\) and \(\left\vert c\right\rangle=\left\vert {\omega }_{X}\right\rangle\) represent the left photon, right photon and exciton state, respectively. Photons tunnel between the left and right cavity with a hopping amplitude t, while Ω is the light-matter coupling. In this case, the emergent \(\left\vert D\right\rangle\) state corresponds to a pure intercavity polariton.
