Baranowski J, Mroz B, Mielcarek S, Iatsunskyi I, Trzaskowska A
ISQI, Faculty of Physics, Adam Mickiewicz University in Poznań, Poznań, Poland.
NanoBioMedical Centre, Adam Mickiewicz University in Poznań, Poznań, Poland.
Sci Rep. 2025 Jan 8;15(1):1358. doi: 10.1038/s41598-025-85742-4.
High-resolution Brillouin spectroscopy was employed to investigate the anisotropy in surface wave velocities within a bulk single crystal of SbTe, a well-known layered van der Waals material. By leveraging the bulk elastic constants derived from various simulation methods, we were able to theoretically calculate the distribution of surface acoustic phonon velocities on the cleavage plane of the material. Upon analyzing multiple simulation results, it became evident that the most significant discrepancies arose in the calculations of the elastic constant c, with values ranging from 48 to 98 GPa. Consequently, a direct measurement of the c elastic constant for SbTe was attempted. Through our ellipsometry results, we determined both the real and imaginary components of the refractive index, leading to an experimental determination of the c elastic constant, which was found to be 47.9 GPa. Additionally the results of the conducted studies enabled the analytical determination of all components of the elastic property tensor of the investigated material.
采用高分辨率布里渊光谱研究了著名的层状范德华材料SbTe体单晶中表面波速度的各向异性。通过利用从各种模拟方法得出的体弹性常数，我们能够从理论上计算材料解理面上表面声子速度的分布。在分析多个模拟结果时，很明显在弹性常数c的计算中出现了最显著的差异，其值范围为48至98吉帕。因此，尝试对SbTe的c弹性常数进行直接测量。通过椭圆偏振测量结果，我们确定了折射率的实部和虚部，从而通过实验确定了c弹性常数，其值为47.9吉帕。此外，所进行研究的结果还能够对所研究材料弹性性质张量的所有分量进行分析测定。
