Exciton linewidth broadening induced by exciton-phonon interactions in CsPbBr3 nanocrystals

Yu Buyang; Zhang Chunfeng; Chen Lan; Huang Xinyu; Qin Zhengyuan; Wang Xiaoyong; Xiao Min

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Exciton linewidth broadening induced by exciton-phonon interactions in CsPbBr3 nanocrystals

机译：CSPBBR3纳米晶体中Exciton-Phonon相互作用引起的激子缠绕宽度

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Quantum dephasing of excitonic transitions in CsPbBr3 nanocrystals has been studied using two-dimensional electronic spectroscopy at cryogenic temperatures. The exciton-phonon interactions for acoustic and optical modes exhibit different effects on the coherent dynamics of excitonic transitions. The homogeneous linewidth shows a proportional dependence on the temperature, suggesting the primary dephasing channel of the elastic scattering between exciton and acoustic modes. The exciton-optical mode interaction is manifested as the beatings of off-diagonal signals in the population time domain at the frequencies of 29 and 51 cm(-1), indicating phonon replicas of excitonic transitions arising from coherent exciton-phonon interaction. The insight information of exciton homogeneous broadening in perovskite nanocrystals is essential for the potential application of quantum light sources.

机译：利用低温下的二维电子光谱研究了CsPbBr3纳米晶体中激子跃迁的量子退相。声模和光模的激子-声子相互作用对激子跃迁的相干动力学表现出不同的影响。均匀线宽与温度成正比关系，表明激子与声模之间的弹性散射是主要的退相通道。激子-光学模式相互作用表现为在29和51 cm（-1）的频率下，在布居时域中非对角信号的拍频，表明激子-声子相干相互作用产生的激子跃迁的声子副本。钙钛矿型纳米晶体中激子均匀展宽的信息对于量子光源的潜在应用至关重要。

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《The Journal of Chemical Physics》 |2021年第21期|共7页
作者
Yu Buyang; Zhang Chunfeng; Chen Lan; Huang Xinyu; Qin Zhengyuan; Wang Xiaoyong; Xiao Min;
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Nanjing Univ Sch Phys Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China;

Nanjing Univ Sch Phys Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China;

Nanjing Univ Sch Phys Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China;

Nanjing Univ Sch Phys Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China;

Nanjing Univ Sch Phys Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China;

Nanjing Univ Sch Phys Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China;

Univ Arkansas Dept Phys Fayetteville AR 72701 USA;

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正文语种 eng
中图分类物理化学（理论化学）、化学物理学;
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机译：耦合激子 - 声子系统中的表面诱导光学双稳态

Exciton linewidth broadening induced by exciton-phonon interactions in CsPbBr3 nanocrystals

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