  WTe$_2$ recently attracted considerable attention as a layered material
exhibiting ferroelectricity, giant magnetoresistance, and pressure-induced
superconductivity. In this study, we performed Raman spectroscopy on bulk
WTe$_2$, including the unreported low frequency region. A novel Raman peak (P0)
was found at approximately 9 cm$^{-1}$ in addition to the seven already known
peaks. Furthermore, the angular and polarization dependence of the spectra
revealed that the novel peak had $A_1$ symmetry. The existence of this novel
peak is consistent with first principles calculations by another group. Our
work paves the way for studying the low frequency vibration modes of atomic
layer ferrolectric films.
