Good morning,
I am calculating the GW gap of some systems, which are quite big so calculations take a while also with parallelization. The convergence of k-point is thus quite difficult so I was reading some threads and I have the following questions:
1) The convergence of the k-point mesh should be independent of the convergence of bands etc. So, could it be done with lower parameters and not the converged ones in order to have faster results?
2) Could I calculate the GW gap with less dense meshes and then extrapolate the results in denser meshes?
Convergence of k-point mesh
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Convergence of k-point mesh
Laura Caputo
Ph.D. Student
Université Catholique de Louvain
https://uclouvain.be/fr/repertoires/laura.caputo
Ph.D. Student
Université Catholique de Louvain
https://uclouvain.be/fr/repertoires/laura.caputo
- Daniele Varsano
- Posts: 3828
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Re: Convergence of k-point mesh
Dear Laura,
the answer is yes to both your questions.
About extrapolation, of course the finer the grid you are ale to calculate the smaller will be the error of the extrapolation.
Best,
Daniele
the answer is yes to both your questions.
About extrapolation, of course the finer the grid you are ale to calculate the smaller will be the error of the extrapolation.
Best,
Daniele
Dr. Daniele Varsano
S3-CNR Institute of Nanoscience and MaX Center, Italy
MaX - Materials design at the Exascale
http://www.nano.cnr.it
http://www.max-centre.eu/
S3-CNR Institute of Nanoscience and MaX Center, Italy
MaX - Materials design at the Exascale
http://www.nano.cnr.it
http://www.max-centre.eu/