- #1
neu
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I realize this a fundamental flaw in my understanding but I can't seem to get my head around it.
I understand that bragg reflection occurs at the zone boundary and so electron wavevectors are diffracted back into the 1st brillouin zone, but what is the justification for only considering the 1st brillouin zone, for example, when considering energy gaps?
This is also connected with my earlier question about why Umklapp processes are required, where large k is transmitted back into 1st brillouin zone by G:
K1+K2=K3+G
I understand that bragg reflection occurs at the zone boundary and so electron wavevectors are diffracted back into the 1st brillouin zone, but what is the justification for only considering the 1st brillouin zone, for example, when considering energy gaps?
This is also connected with my earlier question about why Umklapp processes are required, where large k is transmitted back into 1st brillouin zone by G:
K1+K2=K3+G