I am thinking that maybe we could be starting on metal-related physics on Tuesday. Talking about: having the Fermi level in a band, conductivity. the color of copper, and d-level magnetism. Notice how iron and copper are in the same row and not so far apart in the periodic table (26 and 29, respectively). Iron is the quintessential ferromagnet, and copper is a non-magnetic metal with a yellow-orange-red color. Is there some relationship? What role does the Fermi level play in the conductivity, color and magnetism of metals?...
Here is a video for you to watch before Tuesday class which shows the very unusual nature of conductivity in an ordinary metal. The action focuses on very few electrons, all near the Fermi energy and all moving at high velocity.
Notes on \(\Delta k\):
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