One question on changing the k-point density for BSE

[JXu]

Dear all,

I want to increase the k-point density at the BSE step after I finish the GW calculations, but I am not sure how to set the K-point density in the input. I read the online documents and it seems only KfnQP_N is related, is that true? For example, I just need set KfnQpdb = E < SAVE/ndb.QP ui and KfnQP_N = 2 (or other number)

Thanks for your help.

Jane Xu
Phys. Dept.
Beijing Normal University

[claudio]

Dear Jane Xu

the k-point density, namely the number of k-points entering in the BSE, is determined by
the DFT calculation, so you should restart your calculations with another k-point sampling.

Otherwise you can speed-up the convergence respect to the k-point in the BSE using
the E-RIM ( Energy Random Integration) described here:

http://www.yambo-code.org/doc/inputs/ypp_rim.php

regards
Claudio