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Coherent Exciton-Phonon Coupling in CdSe/ZnS Nanocrystals Studied by Two-Dimensional Electronic Spectroscopy
Rui Wang1, Xin-yu Huang1, Chun-feng Zhang1, Xiao-yong Wang1, Min Xiao1,2
1.National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China;2.Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
Abstract:
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 clearly 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.
Key words:  Two dimensional spectroscopy  Nanocrystal  Eciton-phonon coupling  Dephasing
FundProject:This work was supported by the National Key R&D Program of China (No.2017YFA0303700), the National Science Foundation of China (No.11574140, No.91233103, and No.11621091), Jiangsu Provincial Funds for Distinguished Young Scientists (BK20160019).
CdSe/ZnS纳晶中相干电声耦合效应的二维电子光谱研究
王睿1, 黄欣雨1, 张春峰1, 王晓勇1, 肖敏1,2
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
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DOI:10.1063/1674-0068/30/cjcp1711222
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