Fig. 1
Schematic sketch of the considered system. (a) Scheme of the Sb2Te3 crystal lattice, (b) Schematic view of BLS backscattering geometry. Symbols ki, ks and q, denote incident light, scattered light and surface acoustic wave vectors, respectively, while \(\Theta\) is the incident angle. (c) Schematic illustration of the sample holder for the surface phonon anisotropy investigations.
