Yambo Community Forum

Dear Pushpendra,

I do not know why there is no transition from the fully filled bands to partially filled bands or partially filled bands to empty bands

All these transitions are taken into account, but you need at least one completely filled and completely empty band to build the BSE matrix, in order to include all the metallic bands.
You can include it in an empirical way using the input variable: where you have to assign manually the Drude plasmon and its lifetime. These are empirical and you need to extract from the literature (either experiments or theoretical values).

Best,
Daniele

Dear Daniele,

Thank you for the reply and the clarifications. It's really helpful to understand the raised problems.

Wishes
Pushpendra