Room temperature continuous-wave excited biexciton emission in perovskite nanoplatelets via plasmonic nonlinear fano resonance

• Published in: Communications physics 2019-07, Vol.2 (1), Article 80
• Main Authors: Chen, Jie, Zhang, Qing, Shi, Jia, Zhang, Shuai, Du, Wenna, Mi, Yang, Shang, Qiuyu, Liu, Pengchong, Sui, Xinyu, Wu, Xianxin, Wang, Rui, Peng, Bo, Zhong, Haizheng, Xing, Guichuan, Qiu, Xiaohui, Sum, Tze Chien, Liu, Xinfeng
• Format: Article
• Language: English
• Subjects: 14/34; 639/301; 639/301/1019; 639/301/1019/1021; 639/624; 639/624/399; Physics; Physics and Astronomy
• ISSN: 2399-3650; 2399-3650
• DOI: 10.1038/s42005-019-0178-9

Biexcitons are a manifestation of many-body excitonic interactions, which are crucial for quantum information and computation in the construction of coherent combinations of quantum states. However, due to their small binding energy and low transition efficiency, most biexcitons in conventional semiconductors exist either at cryogenic temperatures or under femto-second pulse laser excitation. Herein, we demonstrated strong biexciton emissions from CsPbBr 3 nanoplatelets with continuous-wave excitation at room temperature by coupling them with a plasmonic nanogap. The exciton occupancy required to generate biexciton was reduced ~10 6 times in the Ag nanowire–Ag film nanogaps. The extremely large enhancement of biexciton emissions was driven by nonlinear Fano resonance between biexcitons and surface plasmon cavity modes. These results provide new pathways to develop high efficiency non-blinking single photon sources of biexciton (with spectral filter for biexciton), entangled light sources, and lasers based on biexciton states. The quasiparticle the biexciton is expected to be an important component in the construction and application of quantum states in quantum information computing but is typically not stable under ambient conditions. Here, the authors use nanoplasmonics to achieve the generation of biexcitons at room temperature in perovskite nanoplatelets.