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

J. L. Liu, G. Jin, Y. S. Tang, Y. H. Luo, K. L. Wang, D. P. Yu

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)586-588
Number of pages3
JournalApplied Physics Letters
Volume76
Issue number5
DOIs
Publication statusPublished - 2000 Jan 31

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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