Hi, everyone,
On each q point I got, the phone frequencies are positive. But after the Fourier interpolation process, There exist negative frequencies. I check the some special q points using ph.x, there are no negative frequencies. I know the dynamical matrices for metal are not smooth function of q, but how do I fix it to get the right dispersion curves? Thanks a lot. Sincerely, Pan Hao Tulane University -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.democritos.it/pipermail/pw_forum/attachments/20100728/39355e65/attachment.htm
