Resonance Raman Scattering in TlGaSe2 Crystals

摘要

The resonance Raman scattering for geometries Y(YX)Z and Y(ZX)Z at temperature 10?K and infrared reflection spectra in E∥a and E∥b polarizations at 300?K were investigated. The number of Aa (Ba) and Au (Bu) symmetry vibrational modes observed experimentally and calculated theoretically agree better in this case than when TlGa2Se4 crystals belong to D2h symmetry group. The emission of resonance Raman scattering and excitonic levels luminescence spectra overlap. The lines in resonance Raman spectra were identified as a combination of optical phonons in Brillouin zone center.