On the attached file the tight binding dispersion for a 2d square lattice is described. It is then assumed that the fermi surface is a square. My question is: How can it ever be a perfect square when the dispersion looks as it does.
Also can someone explain:
Why does the half filled case correspond to:
-1 electron per lattice site (why will 2 electrons not occupy the ground state etc.)
- chemical potential μ=0
Also can someone explain:
Why does the half filled case correspond to:
-1 electron per lattice site (why will 2 electrons not occupy the ground state etc.)
- chemical potential μ=0
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