by **Weiqing Zhou** » Thu May 30, 2019 4:48 am

Dear Daniele,

I want to make sure the dielectric function from Yambo is in the unit of vacuum dielectric function $\epsilon_{0}$, which can be rewritten as

$\epsilon_{0}=\frac {e^{2}}{2\alpha h c}$ where $e$ is the elementary charge, $h$ is exact Planck constant, $\alpha$ is the dimensionless fine-structure constant and $c$ is the light velocity. No any prefactor else?

I want to get conductivity, and a well-fined unit is very important. Now the problem I face is the conductivity I convert from Yambo is two orders of magnitude smaller than that of other articles, while other details are all same.

Best,

Weiqing

Weiqing Zhou

Phd student

Wuhan University

Wuhan, Hubei, 430072