Acoustic Phonons in Periodical GeSiSn/Si Nanostructures

K. V. Anikin, V. A. Timofeev, D. Solonenko, A. I. Nikiforov, A. G. Milekhin, D. R.T. Zahn

Research output: Contribution to journalConference articlepeer-review

Abstract

We apply Raman spectroscopy to study the phonon spectrum in periodical GeSiSn/Si nanostructures with Sn concentration varied from 0 to 20%. In the optical spectral region, an insignificant shift of the phonon mode positions with a variation of the Sn content prevents determination of Sn concentration relying only on the optical phonons behavior. In the acoustic region, we observe the doublets of the folded acoustic phonons, the spectral positions of which undergo the low-frequency shift with increasing the Sn content. The application of the elastic continuum model with the linear approximation of sound velocity via Sn content in GeSiSn layers fails to explain the experimental results. This indicates a nonlinear Sn concentration dependence of sound velocity in GeSiSn layers which describes well the positions of the folded acoustic phonons.

Original languageEnglish
Article number012005
Number of pages7
JournalJournal of Physics: Conference Series
Volume1461
Issue number1
DOIs
Publication statusPublished - 1 Mar 2020
Event4th International Conference on Metamaterials and Nanophotonics, METANANO 2019 - St. Petersburg, Russian Federation
Duration: 15 Jul 201919 Jul 2019

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