[gpaw-users] Dielectric Function

[Torsten Hahn]

Hi Jun,

Am 11.01.2011 um 09:50 schrieb Jun Yan:

> Hi, Torsten,
> 
>  Do you mean that you want to get the diagonal elements (eps_x,y,z) of a 9 component dielectric tensor ?   If so, you can find tutorial and manual at https://wiki.fysik.dtu.dk/gpaw/tutorials/dielectric_response/dielectric_response.html#df-tutorial
> https://wiki.fysik.dtu.dk/gpaw/documentation/tddft/dielectric_response.html#df-theory
>  The current version can't support calculating the off-diagonal elements (fx: eps_xy, eps_xz) of the dielectric tensor   .
> 
>  The dielectric function, which is both wave-vector (q) and frequency (w) dependent, is calculated in a different way for excitations with photons (q-->0) and electrons (finite q).  If you are interest in optical excitations, you can follow the example 1 in the above tutorial.
> 

sorry for the unclear expression. Yes i need the diagonal elements of the dielectric tensor. My question is rather technical: How do i access the values? The functions get_dielectric_function() etc. seems not to give access to the values ...

Thx,
Torsten.