Abstract
Under the formation of the commensurate charge density wave (CCDW) in the layered compound materials, the new lines become observable both in the infrared absorption and the Raman scattering spectra. We present theoretically the microscopic mechanisms of these new lines. The following mechanisms are considered. (1) The originally infrared or Raman active mode is hybridized with the modes folded onto the Γ-point through the electron-phonon couplings. As a result, some of these modes are given the infrared or Raman activities. (2) Contributions from the collective modes of CDW. We develop these ideas and apply them to the case of 1T-TiSe 2, which shows rather simple CCDW. It is found that in the case of 1T-TiSe 2, the new lines are explained by these mechanisms.
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