in order to generate interatomic force constants that then give you phonon dispersions you need to compute dynamical matrices for a grid of q points (1d grid in your case i would say). gamma is a point always present in the grid so you can reuse its data. how many additional points you need to add depends on how far the interatomic force constants extend and how large is your system. for large systems even just gamma might be enough (need to be tested) stefano
On 09/24/2013 03:19 AM, Peng Tao wrote: > Dear all, > > I have calculated the phonon frequencies of gamma point before, and now I'm > planning to > calculate its phonon dispersion curve. Can I use the results of gamma point? > If not, phonon > of the gamma point needs to be recalculated, which is really a waste of time. > > My system is quite large and one-dimensional, so the gamma point is > exclusively important. > If it is possible to make use of previous results, plenty of time will be > saved. > > Thank you very much! > > > Warmest regards, > Peng Tao > > > > -- > ------------------------------------------------------------------- > PH.D. candidate Peng Tao > Magnetism and Magnetic Materials Division > National Laboratory for Material Science > Institute of Metal Research, Chinese Academy of Sciences > Phone +86-024-83978751 > ------------------------------------------------------------------- > > > > _______________________________________________ > Pw_forum mailing list > Pw_forum at pwscf.org > http://pwscf.org/mailman/listinfo/pw_forum
