[Pw_forum] Questions about the DFPT review paper

[Lorenzo Paulatto]

On 25 October 2012 02:38, 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?
>

If I remeber correctly, replace \Delta\psi from eq 28 in eq 23


>
> 2. Why the left side of Eq.25 has a null eigenvalue?
>
>
It may be better explained in Messiah "Quantum mechanics" book (1962), have
you tried to have a look there?

bests



-- 
Dr. Lorenzo Paulatto
IdR @ IMPMC -- CNRS & Université Paris 6
phone: +33 (0)1 44275 084 / skype: paulatz
www:   http://www-int.impmc.upmc.fr/~paulatto/
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