This question refers to Page 167, fig 15.4. It's basically from all the Merton physicists.
You came up with a great answer to why adding a reciprocal lattice vector to a phonon wave means that nothing changes, because the key points are the atoms, and their motion is unchanged.
So what about nearly free electrons? If I add all that momentum to the electron, how is it the same wavefunction? Or is the bold line on the diagram listed above the only physical region the electron can be in?
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