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科学报告会:Room-temperature strong light-matter coupling and polariton condensation in perovskite materials

来源:  发布时间:2018-10-30 10:59:47 点击次数:

报告题目:Room-temperature strong light-matter coupling and polariton condensation in perovskite materials

报告人:熊启华 教授(新加坡南洋理工大学数理科学学院和电气电子工程学院)

报告时间:2018112日(周五)上午10:00

报告地点:物理学院新楼大报告厅


报告摘要:

Strong light-matter coupling phenomena have been reported in a wide range of organic and inorganic semiconductors, while the demonstrations of the polariton condensation and the subsequent polariton lasing are still limited within a handful of semiconductors at both low and room temperatures. In inorganic materials, polariton condensation significantly relies on sophisticated epitaxial growth, while organic active media usually suffer from large threshold density and weak nonlinearity due to the Frenkel exciton nature. In this respect, strong efforts have been devoted in hybrid organic-inorganic perovskite materials, as they combine the advantages of both inorganic and organic materials. In this talk, I will first present room-temperature exciton polariton formation and polariton lasing all inorganic CsPbCl3 thin crystals embedded in a planar microcavity, unambiguously evidenced in the blue region of the visible spectrum by superlinear power dependence, macroscopic ground state occupation, blueshift of the ground state emission, narrowing of the linewidth and the build-up of long-range spatial coherence. Next, I will present our latest results room temperature manipulation of polariton condensate in a perovskite CsPbBr3 microwire cavity, which exhibits an ultrafast propagation over a microscopic length scale of ~ 60 mm. Such successful realization of room-temperature strong light-matter effects at different wavelengths and in different perovskite crystals geometries advocates the considerable promise of perovskite materials for all-optical integrated circuits and ultrafast polaritonics applications. Finally, I will cover briefly our recent breakthrough of using perovskite materials for high performance lighting applications, highlighting the promise in optoelectronic applications.


References:

1. R. Su et al., “Room temperature one-dimensional polariton condensate propagation in lead halide perovskites”, Science Advances 4,  eaau0244, DOI: 10.1126/sciadv.aau0244 (2018)

2. K.B. Lin et al., “Perovskite light-emitting diodes with external quantum efficiency exceeding 20 per cent”, Nature 562, 245-248 (2018)

3. J. Xing et al., “Color-stable highly luminescent sky-blue perovskite light-emitting diodes” Nature Communications, DOI: 10.1038/s41467-018-05909-8 (2018)


报告人简介:

熊启华是南洋理工大学数理科学学院和电气电子工程学院双聘教授。1997年本科毕业于武汉大学物理系,2000年从上海应用物理研究所获得硕士学位,2006年于宾夕法尼亚州立大学获得博士学位。2006-2009年在哈佛大学Charles Lieber研究组从事博士后研究。2009年初获得新加坡国立研究基金研究员项目资助并于当年6月加入南洋理工大学,任南洋助理教授。2014年获得终身教职,2016年升正教授。2014年起担任数理科学学院副院长主管科研和研究生教育,2017年起主要负责教职事务。熊启华教授的主要研究领域是以稳态和瞬态光谱学为主要实验手段,以光和物质相互作用为研究主题, 着重研究低维半导体纳米材料基于光子-声子-电子耦合作用的物理机制和量子调控。他在纳米光子学和表面等离子体学,激光制冷,以及二维半导体材料光学性质等一系列前沿课题做出了一系列有影响的工作。在《自然》及子刊, 《科学进展》,《纳米通讯》,《先进材料》等一系列国际知名杂志上发表了190多篇文章,并被世界知名杂志及大众媒体所报道,总引用次数超过8400次,H-因子54。其出色的研究获得了一些奖励和认可,比如新加坡物理学会纳米科技奖(2015),新加坡国立研究基金NRF Investigatorship奖(2014),和南洋理工大学南洋研究卓越奖(2014)等。 20184月起,担任美国光学学会旗舰杂志《Optics Express》副主编,9月当选美国物理学会会士。




邀请人:王建波教授


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