What is the reason for the general lack of spherical symmetry of Fermi surfaces?

Physics Q&A
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When looking at the Fermi surface database, most of the material don’t have a neat shape like alkali metals. Why not?
My initial guess is due to multiple valence electrons that somehow interact, but copper has two valence electrons, and still has a relatively ‘nice’ shape.

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You’ll have to wait till the second half of the course :smiling_face_with_sunglasses:

We’ll get to it!

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Perfect, I will be waiting :grin: