Coherent Exciton-Phonon Coupling in CdSe/ZnS Nanocrystals Studied by Two-Dimensional Electronic Spectroscopy  

CdSe／ZnS纳晶中相干电声耦合效应的二维电子光谱研究

作　　者：王睿 黄欣雨 张春峰 王晓勇[1] 肖敏[1,2] 

机构地区：[1]南京大学物理学院国家固体微结构实验室人工微结构科学与技术协同创新中心,南京210093 [2]阿肯色大学物理学院,费耶特维尔

出　　处：《Chinese Journal of Chemical Physics》2017年第6期637-642,I0001,共7页化学物理学报（英文）

摘　　要：Coherent exciton-phonon coupling in CdSe/ZnS nanocrystals have been investigated by temperature-dependent two-dimensional electronic spectroscopy （2DES） measurements. Benefiting from the ability of 2DES to dissect assembles in nanocrystal films, we have dearly identified experimental evidences of coherent coupling between exciton and phonon in CdSe/ZnS nanocrystals. In time domain, 2DES signals of excitonic transitions beat at a frequency resonant to a longitudinal optical phonon mode; in energy domain, phonon side bands are distinct at both Stokes and anti-Stokes sides. When temperature increases, phonon-induced exciton dephasing is observed with dramatic broadening of homogeneous linewidth. The results suggest exciton-phonon coupling is essential in elucidating the quantum dynamics of excitonic transitions in semiconductor nanocrystals.

关 键 词：Two dimensional spectroscopy Nanocrystal Eciton-phonon coupling DEPHASING 

分 类 号：O[理学]