Anharmonicity of Lattice Vibrations in Bi2Se3 Single Crystals

The temperature dependences of the Raman-active frequencies , in layered Bi 2 Se 3 single crystals are studied. The contribution of the thermal expansion to a temperature variation in the frequencies is determined. The decay of the anisotropy of the elastic properties in layered Bi 2 Se 3 single cry...

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Bibliographic Details
Published in:Semiconductors (Woodbury, N.Y.) N.Y.), 2019-03, Vol.53 (3), p.291-295
Main Authors: Badalova, Z. I., Abdullayev, N. A., Azhdarov, G. H., Aliguliyeva, Kh. V., Gahramanov, S. Sh, Nemov, S. A., Mamedov, N. T.
Format: Article
Language:English
Subjects:
Anharmonicity
Bismuth tellurides
Crystal lattices
Diffusion
Elastic anisotropy
Elastic properties
Lattice vibration
Magnetic Materials
Magnetism
Mathematical analysis
Nonelectronic Properties of Semiconductors (Atomic Structure
Physics
Physics and Astronomy
Single crystals
Spin-orbit interactions
Thermal expansion
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Summary:The temperature dependences of the Raman-active frequencies , in layered Bi 2 Se 3 single crystals are studied. The contribution of the thermal expansion to a temperature variation in the frequencies is determined. The decay of the anisotropy of the elastic properties in layered Bi 2 Se 3 single crystals due to strong spin–orbit coupling is shown. The Gruneisen-mode parameters for phonons and are calculated. Systematic features in the dependences of vibrational frequencies on the atomic masses in layered Bi 2 Te 3 , Bi 2 Se 3 , and Sb 2 Te 3 single crystals are determined.
ISSN:1063-7826
1090-6479
DOI:10.1134/S1063782619030035