[gpaw-users] gw_skn and eshift in BSE

[Jingjing SHAO]

Dear gpaw-users,

I have a bit of confusion with the eshift and gw_skn in the BSE module.
As eshift does already the correction of the eigenvalue of the KS-DFT
results, is it necessary to add the gw_skn wenn I only have calculated the
VB and CB in the G0W0?
I sometimes have the BSE spectrum appearing in the negative energy region
when the system has very little band gap... I am not sure where it
comes from and is it even possible? It would be really kind if you could
help to explain this observation from your perspective..
Thank you!

Best regards,
Jingjing
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