Fig. 3: Crossover from two-level OSE to ATE.

a Δ dependence of the energy shift in the σ⁺σ⁺ configuration for a pump intensity of 0.56 GW/cm². The red curve shows the calculated energy shift based on the three-level system model. The black curve is the δE_Stark calculated using Eq. (1) for μ = 19 D at the corresponding pump intensity. The top scale shows the pump energy. The gray dashed line indicates half of the band-edge exciton energy. b The energy diagrams of the Δ-dependent hybridization of the photon-dressed states and the lowest CB state |+1/2>^so, which can be probed in the σ⁺σ⁺ configuration. The orange lines represent the eigenstates after the hybridization with the photon-dressed states. The hybridizations of the other photon-dressed states with |−1/2 >^v and |+3/2>^he are not shown, for simplicity. c, d Δ dependence of the energy shift (c) and the corresponding energy level diagram (d) in the σ⁺σ⁻ configuration.