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Coherent interaction between matter and periodic light field induces bothoptical Stark effect (OSE) and Bloch-Siegert shift (BSS). Observing the BSS hasbeen historically challenging, not only because it is weak but it is oftenaccompanied by a much stronger OSE. Herein, by controlling the light helicity,we can largely restrict the OSE and BSS to different spin-transitions in CsPbI3perovskite quantum dots, achieving room-temperature BSS as strong as 4 meV withnear-infrared pulses. The ratio between the BSS and OSE magnitudes is howeversystematically higher than the prediction by the non-interacting,quasi-particle picture. With a model that explicitly accounts for excitoniceffects, we quantitatively reproduce the experimental observations. This modeldepicts a unified physical picture of the interplay between the OSE,biexcitonic OSE and BSS in low-dimensional materials displaying strongmany-body interactions, forming the basis for the implementation of theseeffects to information processing, optical modulation and Floquet engineering.

Excitonic Bloch-Siegert shift in CsPbI3 perovskite quantum dots