Tomorrow I am thinking that we could discuss conductivity in a metal. It is not as simple as you might think because of all the occupied states. Most electrons are in a state where essentially every nearby state (in energy or k) is occupied and they are pretty hemmed in by that. So it is pretty different from conductivity in a semi-conductor where almost every state is empty (in the conduction band).
So how are electrons in a metal able to move if all nearby states are occupied? What is a microscopic way to view metal conductivity?
(Also in tomorrow's class let's try to set priorities for future classes.)
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