Here are some things you could read about relevant to our class tomorrow and after that:
Fermi Surface
Fermi sphere
conductivity in a metal
Fermi surface instabilities.
Ferromagnetism
Mott-Hubbard insulator
spontaneous symmetry breaking
(spontaneously broken symmetry)
superconductivity
anti-ferromagnetism
...
"more is different" (Anderson)
try online sources...
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