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Nearly Free Electrons

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" The central rule of electron dynamics is that an electron once in the nth Brillouin zone remains in the nth Brillouin zone. This claim will be demonstrated in Chapter 16. "

 

Tightly Bound Electrons

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From Omar,

 

From "Ibach and Luth, Solid-State Physics : An Introduction to Principles of Materials Science"

 

 

 

 

from Hoffman's book