This question is resolved. I understand a little better now that in small
field regime one solves for polarized Bloch states and as such the charge
density is indeed periodic.
Mostafa
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Dear all,
I plotted the total potential (bare + Hartee + xc) for MgO under finite
electric field applied via Berry Phase approach. This is basically example 09
in CPV/examples and I run the same calculation also using PWscf. Attached is
the result. In particular the macroscopic average of the
