Yambo Community Forum

Dear Developers,

As I understand due to the used approximation for 2-dimensional materials for which unitless epsilon values are in the order of 1e-6 the results are not comparable with bulk materials. Is there any transformation to compare my results with bulk materials?

Best regards.
Zafer

Dear Zafer,
when dealing with 2D structure using cutoff coulomb potential the code also provides the polarisability alpha as output. This is the quantity you should look at.
Best,

Daniele

Dear Daniele,

Is it possible to obtain the absorption coefficient or reflectivity of a metal by using alpha?
Thank you very much for your generous help.

Best regards.
Zafer

Dear Zafer,

I would say yes, alpha is defined as:

alpha=-X/q^2 where X is the response function.

Best,
Daniele