Fig. 3: Short-time dynamics and intercavity polaritons.

a Sketch of the relevant energy levels. Fine-tuning the left cavity photon energy shifts the energy of the three polariton states and leads to a pure intercavity polariton, \(\left\vert {{{{{{{\rm{MP}}}}}}}}\right\rangle\), formed by the admixture of \(\left\vert {\omega }_{c}^{L}\right\rangle\) and \(\left\vert {\omega }_{X}\right\rangle\) (green shaded area). The gray area symbolizes the presence of the dark exciton reservoir. b Normalized fluorescence lifetime showing the short-time dynamics of the middle and lower polaritons. The dynamics of the MP is displayed with orange and green asterisks for δ/eV = − 0.37 and δ/eV = 0.0, respectively. The LP decay is illustrated with blue and purple asterisks for δ/eV = − 0.37 and δ/eV = 0, respectively. Shaded pink depicts the region where the fastest decay component dominates the early polariton dynamics. c, d s-polarized fluorescence, expressed in counts per integration time, for δ/eV = − 0.37 and δ/eV = 0, respectively. The energy of the bare exciton is represented by the dashed white line. Photons are injected at ω_p/eV = 2.6 which lies at the energy of the upper polariton. e Hopfield coefficients of the UP for δ/eV = 0 showing that it is predominantly formed by right cavity photons. The black, blue and red curves correspond to the left cavity photon, right cavity photon and exciton component, respectively.