[Pw_forum] Questions about the DFPT review paper

Stefano Baroni baroni at sissa.it
Sat Oct 27 10:37:02 CEST 2012

I did before reading your reiterated answer. Usually, asking the same question over and over again actually decreases the chances of it being answered ... SM

On Oct 26, 2012, at 2:25 AM, Caloma Trumica wrote:

> Can someone help answer my questions. Thank you so much!
> On Wed, Oct 24, 2012 at 7:38 PM, Caloma Trumica <spmmal at gmail.com> wrote:
> 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!
> Andy
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Stefano Baroni -  http://stefano.baroni.me, stefanobaroni (skype)
on leave of absence from SISSA, Trieste, presently at the Department of Materials, EPF Lausanne (untill March 2013)

La morale est une logique de l'action comme la logique est une morale de la pensée - Jean Piaget

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