Posted by J on April 10, 2014, 2:47 pm
Hi,
Wondered if you could just clarify a few points for me?
I'm trying to understand how figure 13.5 relates to figure 16.3, fig 16.5 and fig 16.6 in terms of the BZs.
So they are both in k space. In fig 16.3 we talk about how the BZ zone is periodic in k space so we see that the fermi surface is continuous for the strong potential. However, I don't understand how on fig 16.5 we can see the overlap into the 2nd BZ zone. Is this considering a different zone scheme? How is this periodic in k space?
In the reduced zone scheme for fig 16.6 I understand how you can draw each BZ zone as a square since they all have the same area and you have acheived the 2nd band diagram by translating by G. Am I right to understand that the extended scheme is almost like colouring in the fermi surfaces on figure 13.5?
Sorry if these questions aren't very well defined, I would appreciate any help at all. Thanks! 
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