# Effective mass of the electron for Si

ZeroFunGame
TL;DR Summary
Which effective mass should I use?

Looks like the effective mass for holes in Si can either be 0.57 or 0.81, according to the link above.

Is there a temperature regime where one effective mass should be used instead of the other?

Is anyone able to explain in layman's terms why the effective mass is disputed?

Gold Member
There are two bands at $\Gamma = 0$, the light and heavy holes, each has their own band curvature which is related to the effective mass for each..

ZeroFunGame
Forgive my ignorance, but what is gamma? If there's a link on this topic that I could read more on, that would be great! Thank you!