[Phonopy-users] Doubts about my results

[月. <779...@qq...>]

Dear all:
        I used phonopy to calculate phonon properties of a system consisting 21 atoms using direct methods. However, I do have doubts about the results of phonon band curves. The curve is extraordinarily flat. Could this be a symbol of inaccuracy or this is indeed the correct result?
        The curve is drawn along the gamma to Z direction of the reciprocal lattice. (The lattice is over 30A along this direction.) Because of the size limit of the file, I cannot attach the picture to the mail.
       
        Thanks,
         Best regards


         David