High frequency ε_∞ form BSE

[sdwang]

Dear all,
Is it possible to obtain high frequency dielectric ε_∞ from BSE results, like alpha?

Thanks!

Shudong

[Daniele Varsano]

Dear Shudong,

can you be more explicit on what you wish to calculate?

Daniele

[Davide Sangalli]

Dear Shudong,
from the literature, high frequency dielectric ε_∞ is referred to as the real part of the electronic dielectric function evaluated at w=0

In case, yes, you can obtain it in yambo at different levels of approximation: IP, RPA, TDDFT, and BSE as well.

Two tips:
a) the convergece w.r.t the number of bands might be rather slow
b) you need to go beyond the resonant approximation.

Best,
D.