2026/07/23 by Hans Tornatzky, Jonas Rose, Moritz Meißner +5
#cond-mat.mtrl-sci
The low symmetry of the monoclinic phase of Ga2O3 leads to pronounced optical anisotropy and, consequently, to birefringence, which strongly affects the Raman response. Because Raman scattering is fundamentally sensitive to the polarizability of a material, this anisotropy must be carefully accounted for in order to extract quantitative information - an effort that has only recently been shown to be feasible in such media. Here, we report Raman measurements from all three principal crystal planes (100), (010), and (001), as well as from the (201)-plane of a β-Ga2O3 single crystal. By combining polarization angle-resolved Raman spectroscopy (PARRS) with a newly developed fitting procedure and explicitly accounting for birefringence, we achieve full spectral separation and quantitatively determine the energies and relative Raman tensor elements of all 15 Raman-active modes.