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.

Volodin, V., Timofeev, V., Tuktamyshev, A., Nikiforov, A. (2017). Splitting of frequencies of optical phonons in tensile-strained germanium layers. JETP LETTERS, 105(5), 327-331 [10.1134/S0021364017050137].

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

Tuktamyshev A. R.;
2017

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.
Articolo in rivista - Articolo scientifico
Tensile Ge; Molecular Beam Epitaxy
English
2017
105
5
327
331
none
Volodin, V., Timofeev, V., Tuktamyshev, A., Nikiforov, A. (2017). Splitting of frequencies of optical phonons in tensile-strained germanium layers. JETP LETTERS, 105(5), 327-331 [10.1134/S0021364017050137].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/415082
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