Dear QE users I have a question about calculation of phonon group velocity: I know that it is the slope of phonon dispersion curves (w versus k) but how can I calculate phonon group velocity in different directions of a crystal like in direction of x,y or z? Is it possible in QE to calculate them seperately and have vx,vy,vz for phonons? I appreciate any useful comment.
Best regards,Payam Norouzzadeh -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.democritos.it/pipermail/pw_forum/attachments/20120615/074db514/attachment.htm
