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The G=0 term in electron-hole exchange interaction
Posted: Tue May 11, 2021 8:52 pm
by Xiaoming Wang
Hello,
In yambo implementation, to build the electron-hole exchange kernel V, the G=0 term is disregarded. However, from literatures, this term is responsible for the longitudinal-transverse splitting. I'm wondering why the G=0 term is omitted in the implementation.
Best,
Re: The G=0 term in electron-hole exchange interaction
Posted: Tue May 11, 2021 9:40 pm
by claudio
Dear Xiaoming Wang
there is the possibility to include or exclude the G=0 in the BSE,
depending if you want only longitudinal or also transverse excitons
using the flag:
Lkind= "Lbar" # [BSE] Lbar (default) / full
in order to activate this flag use the verbosity -V resp when you generate the BSE input.
best
Claudio
Re: The G=0 term in electron-hole exchange interaction
Posted: Tue May 11, 2021 10:14 pm
by Xiaoming Wang
Dear Claudio,
Thanks for your quick reply.
Best,
Re: The G=0 term in electron-hole exchange interaction
Posted: Thu Jun 24, 2021 12:18 am
by Xiaoming Wang
claudio wrote: ↑Tue May 11, 2021 9:40 pm
Dear Xiaoming Wang
there is the possibility to include or exclude the G=0 in the BSE,
depending if you want only longitudinal or also transverse excitons
using the flag:
Lkind= "Lbar" # [BSE] Lbar (default) / full
in order to activate this flag use the verbosity -V resp when you generate the BSE input.
best
Claudio
Hi Claudio,
The G=0 term is direction dependent. for Lkind="full", which parameter controls the polarization direction? Is it BLongDir?
Best,
Xiaoming