【9月18日讲座】Polariton Lattices in Perovskite Semiconductors

题     目: Polariton Lattices in Perovskite Semiconductors  

 

主  讲 : 熊启华 教授  清华大学

时间地点: 2020年9月18日(周五)下午14: 30,物理楼552


abstract:


Exciton polaritons are part-light, part-matter strongly interacting Bosonic quasiparticles by dressing excitonic resonances with microcavity photons. They have extremely light effective mass and strong nonlinearity, which have shown tremendous potential in quantum fluid of light (i.e., Bose-Einstein condensate of polaritons), ultrafast polaritonic switching and topological polaritonics. Over the past several decades, this field has been largely fuelled by high quality II-VI (e.g., CdTe) or III-V (e.g., GaAs) quantum wells operating at only cryogenic temperatures constrained by the small exciton binding energy. Some organic materials show promising operation at room temperature, nonetheless they usually suffer from large threshold density and weak nonlinearity. Here in this talk, I will introduce our recent progress in realizing exciton polariton condensate and lasing in a few halide perovskite semiconductors. Then I will show that we can further optically manipulate the condensate by introducing 1D artificial polariton lattices with a large forbidden bandgap opening up to 13 meV. This work further opens a diverse possibility of 2D polariton lattices and network towards quantum simulator and topological lasing.

 

个人简介:

德甲联赛下注xiongqihua,1997nianbenkebiyeyuwuhandaxuewulixi,2006nianyubinxifaniyazhoulidaxuehuodeboshixuewei。2006-2009nianzaihafodaxuecongshiboshihouyanjiu。 2009nianjiarunanyangligongdaxue,rennanyangzhulijiaoshou。2014nianhuodezhongshenjiaozhi,2016nianshengzhengjiaoshou。2014-2019nianjiandanrenshulikexuexueyuanfuyuanzhangzhuguankeyanheyanjiushengjiaoyujijiaozhishiwu。2017nianhuodeguojiatepinzhuanjiazhangqixiangmu, 2018nianhe2019nianfenbieruxuanmeiguowulixuehuihuishiheyataicailiaokexueyuanyuanshi,2019nianjiaruqinghuadaxuewulixi。


熊启华教授的主要研究领域是半导体光学和超快光谱学,聚焦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, 《纳米快报》,《先进材料》等一系列国际知名杂志上发表了240多篇文章,其中《自然》及子刊18篇,并被世界知名杂志及大众媒体所报道,总引用次数超过14000次,H-因子68。其出色的研究获得了一些奖励和认可,比如新加坡国立研究基金首届NRF Investigatorship奖(2014),和南洋理工大学南洋研究卓越奖(2014),新加坡物理学会纳米科技奖(2015),2019年科睿瑞安高被引科学家(交叉科学领域),谷歌学术半导体光学领域全球排名第一。目前担任纳米科技领域顶尖杂志 Nano Letters 的副主编和多家国际知名杂志国际编委,如ACS Photonics,Nano ResearchScience China Materials,曾担任美国、爱尔兰、波兰、韩国等国家的基金评委和中国国家自然科学奖、陈嘉庚科学基金会和求是基金会评委。