[Pw_forum] polarization

[Halima Zaari]

Dear quatum espresso users.
i tried to compute the polarization of GaN i found that 's equal to =-2.36
in the same larticles i found that's = to 0.029 c/m2
such as the polarizaion had 2 tyes haw i can compuye the piezoelctric
polarisation.? and why the code give the value underestimaed compared to
the exprimental one?
thanks in advance

-- 
H.ZAARI
PhD Student in laboratory of magnetism and physics of high energy
Faculty of Sciences in Rabat - Morocco
Email:
* halimazaari at gmail.com <boujnah.mourad at gmail.com>*
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