Electron Theory: Sommerfeld to Bloch

This lecture explores the transition from the free electron model by Sommerfeld to the nearly free electron model based on interactions with periodic background potential. It covers the impact on energy levels, Fermi surfaces, Brillouin zones, electron density states, effective mass, relaxation, mean free path, and the Wiedemann-Franz law. The differences between the two models are highlighted, emphasizing the importance of understanding electron behavior in metals.