[Pw_forum] e-ph

[Paolo Giannozzi]

On Apr 7, 2009, at 9:27 , Ali Tavana wrote:

> Does somebody know the reason of following error in e-ph  
> calculations (when q!=0)?

everybody knows the reason, since the same question has been asked
1001 times, and the answer is always the same. See example07/README:

    The dense grid must contain all k and k+q grid points used in the
    subsequent electron-phonon calculation and must be dense enough to
    produce accurate el-phon coefficients (in particular the double- 
delta
    integral at Ef is very critical). Note that you have to use  
unshifted
    grids (k1=k2=k3=0) only, that include k=0!

P.
---
Paolo Giannozzi, Democritos and University of Udine, Italy