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.

Qiangqiang Wang

Jiqing Tan

Qi Jie

Hongxing Dong

Yongsheng Hu

Chun Zhou

Saifeng Zhang

Yichi Zhong

Shuang Liang

Long Zhang

Wei Xie

Hongxing Xu

Advanced Photonics

Perturbation-driven echo-like superfluorescence in perovskite superlattices

钙钛矿超晶格中的微扰驱动类回波超荧光

Category	Quartile
物理与天体物理	1
物理与天体物理, 光学	1

Perturbation-driven echo-like superfluorescence in perovskite superlattices

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