Complementary detection of confined acoustic phonons in quantum dots by coherent phonon measurement and Raman scattering
Complementary detection of confined acoustic phonons in quantum dots by coherent phonon measurement and Raman scattering
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DOI：
10.1103/physrevb.64.201315
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发表时间：
2001-11-15
影响因子：
3.7
通讯作者：
Lipovskii, AA
中科院分区：
文献类型：
--
作者：
Ikezawa, M;Okuno, T;Lipovskii, AA
利用飞秒泵浦探测技术，在磷酸盐玻璃中的PbSe量子点中观察到了声子相干振荡。的振荡的尺寸依赖性进行了研究。在拉曼光谱中观察到明显的低频峰。弹性球模型很好地解释了频率的尺寸依赖性，但相干声子和拉曼散射的模式是不同的。相干声子测量和拉曼散射被发现在这个系统中的受限声学声子的互补信息。
Coherent acoustic phonon oscillation is observed in PbSe quantum dots embedded in phosphate glass by femtosecond pump-and-probe. The size dependence of the oscillation is investigated. Distinct low-frequency peaks are observed in Raman spectrum for the same samples. The size-dependence of the frequencies is well explained by elastic sphere model, but the observed modes are different to each other for coherent phonon and Raman scattering. Coherent phonon measurement and Raman scattering are found to give complementary information on confined acoustic phonons in this system.