bse claculation

Deals with issues related to computation of optical spectra in reciprocal space: RPA, TDDFT, local field effects.

Moderators: Davide Sangalli, andrea.ferretti, myrta gruning, andrea marini, Daniele Varsano, Conor Hogan

Post Reply
samaneh
Posts: 165
Joined: Tue Jan 21, 2014 9:03 am

bse claculation

Post by samaneh » Sat Jan 23, 2016 12:55 pm

Dear Developers,
I run bse calculation with this error:
[ERROR] STOP signal received while in :[08.01] Main loop
[ERROR] Error in parallel wf distribution
should I reduce the tansfered momenta to 1 (like rpa calculations)
QpntsRXs
1 | 39 | # [Xs] Transferred momenta
or for bse calculations we need all these momenta?
I use wf_collect=true for both scf and nscf calculations
do you think that the error is because of that?!
S. Ataei, PhD student at University of Tehran, Iran.

User avatar
Daniele Varsano
Posts: 4198
Joined: Tue Mar 17, 2009 2:23 pm
Contact:

Re: bse claculation

Post by Daniele Varsano » Sat Jan 23, 2016 1:57 pm

Dear Samanaeh,
you need the screening matrix for all the q vectors. I inveite you to have a look to the equation entering in the BSE kernel, see the W expression [url:http://www.yambo-code.org/theory/docs/doc_BSK.php]here[/url]
As usual, please post input/report/output/job submission script otherwise it is not possible to look at the problem.
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/

samaneh
Posts: 165
Joined: Tue Jan 21, 2014 9:03 am

Re: bse claculation

Post by samaneh » Sat Jan 23, 2016 2:48 pm

Dear Daniele,
Thank you.
Is that possible to calculate the XAS spectrum using yambo+bse?
Best rgards
S. Ataei, PhD student at University of Tehran, Iran.

User avatar
Daniele Varsano
Posts: 4198
Joined: Tue Mar 17, 2009 2:23 pm
Contact:

Re: bse claculation

Post by Daniele Varsano » Mon Jan 25, 2016 10:23 am

Dear Samaneh,
Yambo works with pseudopotential, only valence electrons are treated, so XAS it is not accessible.
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/

Post Reply