However, I think I made the math more complex than necessary:
ki - kf = kph = \frac{2π}{λ}\widehat{k}_{ph}
(ki - kf) / (size of Brillouin zone) = \frac{2π}{λ}\frac{a}{2π}\widehat{k}_{ph} << 1 \cdot \widehat{k}_{ph}
Thanks to all for the reply!
I tried to make the following math.
from energy conservation: Eph≈Egap
(assuming that initial and final electrons are in proximity of, respectively, the maximum of VB and minimum of CB)
We know that kph = ω/c = Eph/(\hbarc)
So, from momentum conservation law:
|kf - ki | = |kph|≈Egap/(\hbarc)...
Hi everybody. I'm new here and, first of all, sorry for my bad english :-D
I'm studying photoelectric absorption in semiconductors.
The book (and professor too) says that, in the conservation law:
ki + kph = kf
(where ki and kf are wave vectors of initial and final electron state, and...