6. Approximate treatment of electrons in a periodic potential: tight-binding approach (14(2h), 19(exercises) Nov. 2025)
Section outline
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The tight-binding approach: introduction, general formulation; the simplified case of s-band arising from a single atomic s-level. Tight-binding in crystals with inversion symmetry; band dispersion (A&M, ch. 10).
Bloch sums and their periodicity in direct space depending to k.