Optical and acoustic phonon modes in self-organized Ge quantum dot superlattices

被引：49

作者：

Liu, JL ^{[1
]}

Jin, G

Tang, YS

Luo, YH

Wang, KL

Yu, DP

机构：

[1] Univ Calif Los Angeles, Dept Elect Engn, Device Res Lab, Los Angeles, CA 90095 USA

[2] Peking Univ, Electron Microscopy Lab, Beijing 100871, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2000年 / 76卷 / 05期

关键词：

D O I：

10.1063/1.125825

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Raman scattering measurements were carried out in self-organized Ge quantum dot superlattices. The samples consisted of 25 periods of Ge quantum dots with different dot sizes sandwiched by 20 nm Si spacers, and were grown using solid-source molecular-beam epitaxy. Optical phonon modes were found to be around 300 cm(-1), and a dependence of the Raman peak frequency on the size of dots was evidenced in good agreement with a prediction based on phonon confinement and strain effects. Acoustic phonons related to the Ge quantum dots have also been observed. (C) 2000 American Institute of Physics. [S0003-6951(00)03305-2].

引用

页码：586 / 588

页数：3

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