Magnetically tunable spontaneous superradiance from mesoscopic perovskite emitter clusters

• Main Authors: He, Ruihua, Abdullah Rasmita, Zhou, Lei, Liang, Liangliang, Cai, Xiangbin, Chen, Jiaye, Cai, Hongbing, Gao, Weibo, Liu, Xiaogang
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2023
• Subjects: Science::Physics; Entangled Photons; Fabrication Cost
• Online Access: https://hdl.handle.net/10356/168943
• Institution: Nanyang Technological University

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.