[x,Vnl] slows the Dipoles computation

[Stephan]

Hi everybody,

A short question: I often read this message in log and report files.

[x,Vnl] slows the Dipoles computation. To neglect it rename the ns.kb_pp file

How much are the computation slowed and why?

Thanks and regards

Stephan

[Daniele Varsano]

Dear Stephan,
how much it depends on how much dipole matrix elements needs to be computed (essentially the bands included in the calculations).
Why, just because they need to be evaluated.
How much they are important, it is system dependent.
Anyway if you do not rename/delete the ns.kb_pp files, the commutator is included by defalut.

Best,
Daniele