For the phonon calculations, we utilized different supercell sizes to accurately capture the vibrational properties of the TMDC systems. Specifically, a 2x2x3 supercell was employed for the 3-atom unit cells, resulting in a total of 36 atoms. Similarly, a 2x2x2 supercell was used for the 6-atom unit cell, encompassing a total of 48 atoms. Additionally, a 1x3x1 supercell was considered for the 18-atom unit cell, comprising a total of 54 atoms. By employing these supercells, we obtained 18 displacements for the 1T phase and 9 displacements for the 2H phase in the 3-atom unit cells. This resulted in a total of 36 displacements for both the 1T and 2H