Abstract
The vibrational representation is expanded in terms of irreducible representations at the principal symmetry points of the Brillouin zone. Selection rules are found for single-phonon IR absorption, Raman scattering, and Mandel'shtam-Brillouin scattering of light. In IR absorption, a single frequency is active for light polarized parallel to the sixth order axis and a single frequency for perpendicular polarization. Five frequencies are active in Raman scattering of light. Expansions of the direct product of irreducible representations (selection rules) are found.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 45–48, November, 1981.
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Kobakhidze, S.A., Gorbachev, V.V., Polygalov, Y.I. et al. Symmetry of lattice vibrations of hexagonal Cu2Te. Soviet Physics Journal 24, 1018–1021 (1981). https://doi.org/10.1007/BF00892505
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DOI: https://doi.org/10.1007/BF00892505