Yambo Community Forum

Dear developers.
When I calculate the linear response of a metallic system using Yambo, it shows the warnings as below,

<02s> [WARNING] The system is a metal but Drude term not included.

And I didn't find the parameters from the tutorials, which can calculate the Drude term of a metallic system automatically.
Looking forward to your reply.

Dear Han Gao,
the Drude parameters are heuristic and you should extract from experiments, or find other ways to extract them (e.g. finite q response and extrapolate to q=0).
Note that the Drude term is ignored in the plasmon pole approximation, if you want to do a GW calculation including intraband terms you need to go for a full frequency calculation.

Best,
Daniele