Raman tensor elements of β-Ga₂O₃.

Area of Science:

• Materials Science
• Solid State Physics
• Spectroscopy

Background:

• Monoclinic β-Ga₂O₃ exhibits complex Raman scattering due to low symmetry.
• Birefringence significantly influences Raman intensity dependence on scattering geometry.

Purpose of the Study:

• To experimentally and theoretically investigate the Raman spectrum and intensities of β-Ga₂O₃.
• To model the polarization-dependent Raman scattering, accounting for birefringence.

Main Methods:

• Measured polarized backscattering Raman spectra on three crystallographic planes.
• Employed a modified Raman tensor formalism incorporating birefringence.
• Performed ab-initio calculations for comparison.

Main Results:

• Determined the spectral positions of all 15 Raman-active phonon modes.
• Quantified Raman tensor elements for 13 phonon modes.
• Achieved good agreement between experimental data and theoretical models.

Conclusions:

• The study provides a comprehensive analysis of β-Ga₂O₃ Raman spectra.
• Accurate determination of phonon modes and Raman tensors is crucial for understanding optical properties.
• The developed model accurately describes the complex scattering behavior in β-Ga₂O₃.