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Homework Statement
I'm trying to understand this part of my notes where the optical absorption in both indirect and direct bandgap semiconductors. This part specifically mathematically describes the change in energy and momentum of an electron in a semiconductor after it has absorbed energy from incident photon.
Qn: Why is [tex]\hbar\vec{q} << \hbar\vec{k}[/tex]?
Homework Equations
http://img222.imageshack.us/img222/9665/qnmj5.th.jpg
This is the part I am referring to.
The Attempt at a Solution
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