[Pw_forum] Question about K-points

[Eyvaz Isaev]

Hi,

--- On Sun, 8/23/09, Duy Le <ttduyle at gmail.com> wrote:

>How about the forces acting on the atoms in 2 cases? Are they too >different?

There are no forces in CaF2 (antifluorite) type structure due to its high symmetry.

Bests,
Eyvaz.

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Prof. Eyvaz Isaev, 
Theoretical Physics Department, Moscow State Institute of Steel & Alloys, Russia, 
Department of Physics, Chemistry, and Biology (IFM), Linkoping University, Sweden 
Condensed Matter Theory Group, Uppsala University, Sweden 
Eyvaz.Isaev at fysik.uu.se, isaev at ifm.liu.se, eyvaz_isaev at yahoo.com