[Pw_forum] V_tot potential curve of vdw-DF is not smooth away from nuclei

[PJ Ren]

Dear all,
I have drawn the V_tot potential curve of vdw-DF and found that it is 
not smooth away from nuclei as expect. I also test LDA and PBE 
functional with same psudo potential and same parameters, no such 
phenomenon was found. I don't know whether it is a problem of vdw-DF or 
the method implemented in QE?

The picture is attached which is V_tot and V_bare curve for carbon nanotube.

Thanks.

Pengju Ren
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