Dear Subhodip, Check example04 provided with pw.x. You can find it in:
/Espresso_folder/PW/examples/example04
>From README:
example04:
This example shows how to calculate the polarization via Berry
Phase in PBTiO3 (contributed by the Vanderbilt Group in Rutgers
University).
I would also recommend this paper:
https://arxiv.org/abs/1202.1831
Mostafa
MIT
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