Splitting of frequencies of optical phonons in tensile-strained germanium layers

V. A. Volodin, V. A. Timofeev, A. R. Tuktamyshev, A. I. Nikiforov

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Tensile-strained germanium films in Ge/GeSn/Si/GeSnSi multilayer heterostructures grown by molecularbeam epitaxy on Si(001) substrates are investigated by Raman spectroscopy. Biaxial tensile strains in the films reach 1.5%, which exceeds values previously obtained for this system. Splitting of frequencies of long-wavelength optical phonons is experimentally observed; i.e., the shift of the frequency of the singlet induced by biaxial tensile strains is larger than the shift of the frequency of the doublet in agreement with calculations. The strain-induced shift of Raman scattering peaks from two-phonon scattering in germanium is also detected.

Original languageEnglish
Pages (from-to)327-331
Number of pages5
JournalJETP Letters
Volume105
Issue number5
DOIs
Publication statusPublished - 1 Mar 2017

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