Photoinduced phase segregation and low coupling efficiency between QDs and cavities make is challenging to achieve stable blue cavity-enhanced superfluorescence in halide-doped perovskite QD system. Here, long-range-ordered CsPbBr2Cl QD superlattices are developed, in which the two core issues can be appropriately addressed. Based on the CsPbBr2Cl QD superlattices with regularly geometrical structures, stable and ultrafast blue cavity-enhanced superfluorescence was realized.
The collective response of macroscopic quantum states under perturbation is widely used to study quantum correlations and cooperative properties, such as defect-induced quantum vortices in Bose–Einstein condensates and the non-destructive scattering of impurities in superfluids. Superfluorescence (SF), as a collective effect rooted in dipole–dipole cooperation through virtual photon exchange, leads to the macroscopic dipole moment (MDM) in high-density dipole ensembles. However, the perturbation response of the MDM in SF systems remains unknown. Echo-like behavior is observed in a cooperative exciton ensemble under a controllable perturbation, corresponding to an initial collapse followed by a revival of the MDM. Such a dynamic response could refer to a phase transition between the macroscopic coherence regime and the incoherent classical state on a time scale of 10 ps. The echo-like behavior is absent above 100 K due to the instability of MDM in a strongly dephased exciton ensemble. Experimentally, the MDM response to perturbations is shown to be controlled by the amplitude and injection time of the perturbations.
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