[gpaw-users] null imaginary part of dielectric function for jellium background

[Morten Niklas Gjerding]

Dear Fulvio.


It sounds like it can be expected. The jellium model contains no scattering so to get a finite imaginary part you have to include a phenomenological relaxation rate. This can be done in the DielectricFunction class by setting the variable "rate"

DielectricFunction(..., rate=0.1, ...)


The units for the rate are in eV.


Kind regards,


Morten.



________________________________
From: gpaw-users-bounces at listserv.fysik.dtu.dk <gpaw-users-bounces at listserv.fysik.dtu.dk> on behalf of fulvio ciriaco via gpaw-users <gpaw-users at listserv.fysik.dtu.dk>
Sent: Wednesday, December 19, 2018 11:04:06 AM
To: gpaw-users
Subject: [gpaw-users] null imaginary part of dielectric function for jellium background

Dear GPaw users,
I was attempting a comparison of spectra obtained by means of jellium
model with spectra of metals of comparable valence electron density.
However, while the comparison is reasonable for the real part of the
dielectric function, the imaginary part of the dielectric function for
the jellium model is null.
Is this somewhat expected for reasons I do not grasp? Or is it an
implementation limitation?
I below attach my input for a somewhat large jellium box with Al metal density.

Fulvio
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