I am mailing you regarding the effect of hiphive on phonon dispersion obtained by Phonopy of a 2D material. I got little negative mode by phonopy (image is attached below). I am trying Hiphive to correct these modes (the code is also attached below). I have tried by increasing the cutoff and changing the parameters (Huang, Born-huang and both), unfortunately none of them are affected these modes. Can you please help me to sort out the issue.
Thanks for your time and consideration.