confused ypp interpolated bandstructures
Moderators: Davide Sangalli, andrea marini, Daniele Varsano
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- Posts: 26
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confused ypp interpolated bandstructures
I just finished G0W0 calculation for a organic crystal. the ypp ploted bandstructure is very strange.
firstly, the old version ypp (3.3.0) plot very correct VB,VB-1,CB and CB+1, but band cross occurs at other bands, see the Figure.
secondly, I also use the newest ypp (3.4.0), band cross are disappeared, however, the energy difference between VB and VB-1 and some other VBs is larger than that from the output of G0W0 (o-gwppa.qp). See in the Figure.
Finally, I checked the o-gwppa.qp. the result explain the band cross in old ypp. the G0W0 eigenvalues is not linearly decrease or increase. Therefore, why it happens?
P.S. I have tested the convergence of G0W0(PPA) calculations.
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ypp.in:
bnds # [R] Bands
electrons # [R] Electrons (and holes)
cooIn= "rlu" # Points coordinates (in) cc/rlu/iku/alat
% BKpts
0.50 | 0.00 | 0.00 | # Bands circuit
0.00 | 0.00 | 0.00 | # Bands circuit
0.00 | 0.50 | 0.00 | # Bands circuit
0.00 | 0.50 | 0.50 | # Bands circuit
0.00 | 0.00 | 0.50 | # Bands circuit
0.00 | 0.00 | 0.00 | # Bands circuit
%
BANDS_steps=11 # Number of divisions
% BANDS_range
247 | 307 | # Bands Range
%
GfnQPdb= "E < ./ndb_LF100.QP" # [EXTQP G] Database
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arlonne
Department of Physics and Astronomy
Northwestern University, IL 60208
Department of Physics and Astronomy
Northwestern University, IL 60208
- Daniele Varsano
- Posts: 3824
- Joined: Tue Mar 17, 2009 2:23 pm
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Re: confused ypp interpolated bandstructures
Dear Arlonne,
thanks for reporting the problem,
We are aware that could a problem in the input QP database in the devel version.
We will correct it in the next days.
Best,
Daniele
thanks for reporting the problem,
We are aware that could a problem in the input QP database in the devel version.
We will correct it in the next days.
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/
- andrea marini
- Posts: 325
- Joined: Mon Mar 16, 2009 4:27 pm
- Contact:
Re: confused ypp interpolated bandstructures
Dear Arlonne, in the latest revision to the devel GPL (revision 48) there was indeed a bug. So the loading of the QP database in version 3.4.0 was wrong.arlonne wrote:
I just finished G0W0 calculation for a organic crystal. the ypp ploted bandstructure is very strange.
firstly, the old version ypp (3.3.0) plot very correct VB,VB-1,CB and CB+1, but band cross occurs at other bands, see the Figure.
secondly, I also use the newest ypp (3.4.0), band cross are disappeared, however, the energy difference between VB and VB-1 and some other VBs is larger than that from the output of G0W0 (o-gwppa.qp). See in the Figure.
Finally, I checked the o-gwppa.qp. the result explain the band cross in old ypp. the G0W0 eigenvalues is not linearly decrease or increase. Therefore, why it happens?
This is now fixed. However, as far as I understand, there is a problem with some bands crossing that seems to be related to the interpolation procedure. We will work further on this issue.
Can you, in the meantime, confirm the problem in the newest ypp 3.4.0 (revision 48) ?
Thanks
Andrea
Andrea MARINI
Istituto di Struttura della Materia, CNR, (Italy)
Istituto di Struttura della Materia, CNR, (Italy)
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- Posts: 85
- Joined: Fri May 03, 2013 10:20 am
Re: confused ypp interpolated bandstructures
Yes, this problem has been resolved after updating my source according this post viewtopic.php?f=9&t=497.
Dr. Zhou Liu-Jiang
Fujian Institute of Research on the Structure of Matter
Chinese Academy of Sciences
Fuzhou, Fujian, 350002
Fujian Institute of Research on the Structure of Matter
Chinese Academy of Sciences
Fuzhou, Fujian, 350002