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Plasmon-phonon coupling in charged n-type CdSe quantum dots: A THz time-domain spectroscopic study

机译:带电n型CdSe量子点中的等离激子-声子耦合:THz时域光谱研究

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摘要

This work aims to experimentally determine the polarizability of confined electron in CdSe quantum dots (QD). The dielectric response of uncharged and charged CdSe quantum dots (3.2 and 6.3 nm) has been measured using terahertz time-domain spectroscopy in the frequency range of 2.0-7.0 THz. A strong coupling between the surface plasmon and surface phonons appears upon charging the QDs. The absolute polarizability of an electron in 3.2 and 6.3 nm charged QDs are experimentally determined to be 0.5 +/- 0.1 x 10(3) angstrom(3) and 14.6 +/- 0.3 x 10(3) angstrom(3), respectively, and the values agree reasonably well with theory and the previous experiment. The observed plasmon-phonon coupling is expected to play an important role in electron relaxation in absence of a hole in CdSe QDs.
机译:这项工作旨在通过实验确定CdSe量子点(QD)中受限电子的极化率。已使用太赫兹时域光谱仪在2.0-7.0 THz的频率范围内测量了不带电和带电的CdSe量子点(3.2和6.3 nm)的介电响应。给量子点充电时,表面等离子体激元和表面声子之间会出现强耦合。通过实验确定,在3.2和6.3 nm带电QD中,电子的绝对极化率分别为0.5 +/- 0.1 x 10(3)埃(3)和14.6 +/- 0.3 x 10(3)埃(3),该值与理论和先前的实验相当吻合。在CdSe QD中不存在空穴的情况下,观察到的等离激元-声子耦合有望在电子弛豫中发挥重要作用。

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