Raman scattering in right angle configuration on Cu2ZnSiSe4 single crystals

- Polarized Raman spectra of Cu2ZnSiSe4 were measured in right angle configuration.
- Selection rules were calculated for the different polarization configurations.
- Low intensity A2, B1 and B2 symmetry peaks were found.
- Resonant Raman spectra of Cu2ZnSiSe4 were measured under different excitation.
- Nature of the observed multiphonon peaks was proposed.

Polarized Raman scattering and resonance Raman scattering spectra of Cu2ZnSiSe4 crystals measured at temperature 300 and 10 K were investigated. Nine vibrational modes of A2 symmetry, seven modes of B2 symmetry and nine modes of B1 symmetry were determined in Raman spectra taken at right angle configuration from the (2 1 0) crystal plane. A resonance Raman scattering with participation of 2LO, 3LO and more phonons was observed at photon energies higher than the ground state of exciton transition at low temperature.