I do not understand the question. Or, at least, it seems to me that you have already given the answer. What's wrong with calculating the slope numerically? Stefano On Jun 16, 2012, at 1:45 AM, Payam Norouzzadeh wrote:
> 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 > _______________________________________________ > Pw_forum mailing list > Pw_forum at pwscf.org > http://www.democritos.it/mailman/listinfo/pw_forum --- Stefano Baroni - SISSA & DEMOCRITOS National Simulation Center - Trieste http://stefano.baroni.me [+39] 040 3787 406 (tel) -528 (fax) / stefanobaroni (skype) La morale est une logique de l'action comme la logique est une morale de la pens?e - Jean Piaget -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.democritos.it/pipermail/pw_forum/attachments/20120616/a6adab80/attachment.htm
