How to calculation the response functions of a metallic system?

[gaohan]

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.

[Daniele Varsano]

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