16
spring break

17
lecture 14
Xray scattering continued, Xray scattering from Bravias lattice with a basis, preview of electrons in a periodic potential

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19
lecture 15
Preview continued: Bloch's theorem, energy gaps at Bragg planes, Brillouin zones, Bornvon Karmen boundary conditions

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21
lecture 16
Fourier transforms on a Bravais lattice, Schrodinger's equation for electrons in a periodic potential, Bloch's theorem more rigorously, crystal momentum and band index
special makeup lecture 12:30
HW #4 due

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23

24
lecture 17
Reduced, repeated, and extended zone schemes for electronic band structure, average velocity of a Bloch electron state, density of states, van Hove singularities, weak potential approximation for electron eigenstates

25

26
lecture 18
Weak potential approximation and the band gap, velocity of electron at a Bragg plane, metals and insulators

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29
