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

Jie Chen,Xinfeng Liu,Wenna Du,Haizheng Zhong,Pengchong Liu,Jia Shi,Shuai Zhang,Xianxin Wu,Xinyu Sui,Bo Peng,Guichuan Xing,Xiaohui Qiu,Qing Zhang,Rui Wang,Tze Chien Sum,Yang Mi,Qiuyu Shang

doi:10.1038/s42005-019-0178-9

Abstract

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 CsPbBr3 nanoplatelets with continuous-wave excitation at room temperature by coupling them with a plasmonic nanogap. The exciton occupancy required to generate biexciton was reduced ~106 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.

Highlights

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
When coupled to a metal structure, quantum dots (QDs) show super-Poissonian statistics of photon emissions, which is different from the behavior of QDs on quartz substrates that exhibit photon antibunching as single quantum emitters[40]
We demonstrate strong biexciton emissions from CsPbBr3 NPLs with continuous-wave excitation at room temperature, and the biexcitonic behavior is validated through experiments and simulations

Summary

Introduction

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. By utilizing a Ag nanowire-Ag film nanogap structure, the exciton occupancy for biexciton emissions of CsPbBr3 NPLs is reduced ~106 times.

Results

Conclusion