Ангармонизм колебаний кристаллической решетки монокристаллов Bi-=SUB=-2-=/SUB=-Se-=SUB=-3-=/SUB=-
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AbstractThe temperature dependences of the Raman-active frequencies $$E_{g}^{2}$$ , $$A_{{1g}}^{2}$$ in layered Bi_2Se_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_2Se_3 single crystals due to strong spin–orbit coupling is shown. The Gruneisen-mode parameters for phonons $$E_{g}^{2}$$ and $$A_{{1g}}^{2}$$ are calculated. Systematic features in the dependences of vibrational frequencies on the atomic masses in layered Bi_2Te_3, Bi_2Se_3, and Sb_2Te_3 single crystals are determined.
2019 ◽
Vol 116
(10)
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pp. 4006-4011
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2015 ◽
Vol 7
(45)
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pp. 24998-25001
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2013 ◽
Vol 454
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pp. 012068
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1992 ◽
Vol 1
(Part_2)
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pp. 285-295