bse calculation

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

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

bse calculation

Post by samaneh » Sun Sep 14, 2014 4:03 pm

Hi there,
1- What is the meaning of the KfnQP_E parameter in bse input file?
I find it in the totorial that it is QP gap correction but I don't know
what does it mean (default value is zero)?
2- what is the meaning of damping range (BDmRange)
in the CPC yambo (2009) for Si it chages from the default ones
to 0.02000 | 0.8000 | eV
but I do not understand the meaning of these values???
Thanks
S. Ataei, University of Tehran
S. Ataei, PhD student at University of Tehran, Iran.

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Daniele Varsano
Posts: 4198
Joined: Tue Mar 17, 2009 2:23 pm
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Re: bse calculation

Post by Daniele Varsano » Sun Sep 14, 2014 4:19 pm

Dear S.Atei,
please have a look to the documentation before asking to the forum:

1) It is documented in the web page. See here!!!!
When doing BSE calculations, you need to input QP energies. You can do it by calculating all QP energies in GW for all the bands entering in BSE, or using scissor operator (rigid shift of the conduction bands, plus stretching), if the approximation is reasonable.

2) There is a full description in the documentation. You can find it here here.

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/

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