[Pw_forum] electronic DOS for a GB system of 60 atoms
Elie Moujaes
elie.moujaes at hotmail.co.uk
Tue Aug 2 22:36:42 CEST 2011
Dear Lars,
Thanks very much for your help.
Elie
Date: Tue, 2 Aug 2011 22:35:16 +0200
From: jenaparadies at googlemail.com
To: pw_forum at pwscf.org
Subject: Re: [Pw_forum] electronic DOS for a GB system of 60 atoms
Dear Elie,
it looks like you have way too few k-points for your nscf calculation. For a
well converged DOS it isnecessary to have sufficient dense k-grid.
By increasing the number of k-points you'll see, that the DOS will
be much smoother, because up to know the 'waves' in your DOS
doesn't seem to be physical, I think they are artificial and a result of a low
k-sampling.
If the grid is dense enough and your DOS doesn't change anymore you
can also decrease the smearing and improve the behaviour of your spectra
close to the gap.
Hope that helps
Lars
2011/8/2 Elie Moujaes <elie.moujaes at hotmail.co.uk>
Dear all,
I am trying to reproduce calculations done on the electronic DOS of a 60 carbon system. I have got that the DOS is around 0.2 at the Fermi level whereas the calculations done previously got that it is exactly zero. In addition their curve seems sharper than mine. I used degauss=0.01 in nscf and scf calculations. the grid for scf was 4 4 1 whilst it was 9 9 1 for nscf. You will find attached the ps file of the DOS. Can anyone advise me on that?
ThanksElie Moujaes
University of NottinghamNG7 2RDUK
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--
Lars Matthes
Institut für Festkörpertheorie und -optik
Friedrich-Schiller-Universität Jena
Max-Wien-Platz 1
07743 Jena
Germany
Phone: +49.3641.947163
Mail: Lars.Matthes at uni-jena.de
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