I wanted to calculate the conductivity of a semiconductor by using the optical constant of that semiconductor. Then I'm having 2 doubts below.

1.Can dielectric function works on semiconductor?

2.From equation of complex permittivity and conversion of dielectric function we have: ε" = σ/ω and ε" = 2nk

σ static conductivity,

n refractive index,

k extinction coefficient.

The question is that can I say σ/ω = 2nk ? I tried to calculate this using optical constant of silicon at 632.8nm. which gives a conductivity of 10 to power of 14 which seems not quite right, also the unit of both sides are not the same.