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arXiv 1806.06112cond-mat.mtrl-sci
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核壳胶体量子点中振动耦合对光谱扩散的影响

Vibrational Coupling Modifies Spectral Diffusion in Core-Shell Colloidal Quantum Dots

A. Liu, D. B. Almeida, W. K. Bae, L. A. Padilha, S. T. Cundiff

摘要:

我们在低温下对CdSe/CdZnS核/壳胶体量子点进行了二维相干光谱研究。在二维光谱,边带由于与CdSe晶格LO-声子模式的电子耦合观察到偏离的马尔可夫光谱扩散预期的指数退相的演变。模拟比较提供了进一步的证据,LO-声子模式耦合本身显着修改激子lineshapes和超快时间尺度上的光谱扩散的基础结果。

英文摘要:

We perform two-dimensional coherent spectroscopy on CdSe/CdZnS core/shell colloidal quantum dots at cryogenic temperatures. In the two-dimensonal spectra, sidebands due to electronic coupling with CdSe lattice LO-phonon modes are observed that have evolutions deviating from the exponential dephasing expected from Markovian spectral diffusion. Comparison to simulations provides further evidence that the LO-phonon mode coupling itself significantly modifies the exciton lineshapes and results in the underlying spectral diffusion on ultrafast timescales.

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