Dear all, There is one question always puzzles me. If my understanding is correct, for lattice dynamics, the q-point denotes the propagation direction of the lattice wave, while the eigenvector represents the vibration direction of a specific atom. Waves whose eigenvectors are perpendicular to the q-point are transverse waves while parallel are longitudial wave. Moreover, there should be 2N transverse modes and N longitudial ones.
However, I checked the results from ph.x, there did not seem to exist such relations. I am afraid if my understanding was wrong or I have used the wrong interpretation of the eigenvectors. Anyone can help me out? Besides, the eigenvectors given by ph.x should be in cartesian coordination, right? Thanks. Konzern -------------- next part -------------- An HTML attachment was scrubbed... URL: /pipermail/attachments/20060221/b393e77c/attachment.htm
