posted on 2023-03-08, 21:33authored byRuihua He, Abdullah Rasmita, Lei Zhou, Liangliang Liang, Xiangbin Cai, Jiaye Chen, Hongbing Cai, Weibo Gao, Xiaogang Liu
Perovskite
emitters are promising materials as next-generation
optical sources due to their low fabrication cost and high quantum
yield. In particular, the superradiant emission from a few coherently
coupled perovskite emitters can be used to produce a bright entangled
photon source. Here, we report the observation of superradiance from
mesoscopic (<55) CsPbBr3 perovskite emitters, which
have a much smaller ensemble size than the previously reported results
(>106 emitters). The superradiance is spontaneously
generated
by off-resonance excitation and detected by time-resolved photoluminescence
and second-order photon correlation measurements. We observed a remarkable
magnetic tunability of the superradiant photon bunching, indicating
a magnetic field-induced decoherence process. The experimental results
can be well explained using a theoretical framework based on the microscopic
master equation. Our findings shed light on the superradiance mechanism
in perovskite emitters and enable low-cost quantum light sources based
on perovskite.