Open AccessАнгармонизм колебаний кристаллической решетки монокристаллов Bi-=SUB=-2-=/SUB=-Se-=SUB=-3-=/SUB=-
Author(s) -
З.И. Бадалова,
Н.А. Абдуллаев,
Г.Х. Аждаров,
Х.В. Алигулиева,
С.Ш. Кахраманов,
С.А. Немов,
Н.T. Maмедов
Publication year - 2019
Publication title -
fizika i tehnika poluprovodnikov
Language(s) - English
Resource type - Journals
eISSN - 1726-7315
pISSN - 0015-3222
DOI - 10.21883/ftp.2019.03.47279.8987
Subject(s) - anisotropy , phonon , grüneisen parameter , raman spectroscopy , condensed matter physics , thermal expansion , coupling (piping) , materials science , physics , optics , metallurgy
The 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.