[Pw_forum] Questions about the DFPT review paper

Caloma Trumica spmmal at gmail.com
Thu Oct 25 02:38:10 CEST 2012

Dear all,

I do not understand why the two highlighted places in the attached DFPT
review paper are correct.

I repeat my questions here:

1. Why the contributions from valence bands cancel each other?

2. Why the left side of Eq.25 has a null eigenvalue?

Thank you!

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