16
spring break
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17
lecture 14
X-ray scattering continued, X-ray scattering from Bravias lattice with a basis, preview of electrons in a periodic potential
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18
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19
lecture 15
Preview continued: Bloch's theorem, energy gaps at Bragg planes, Brillouin zones, Born-von Karmen boundary conditions
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20
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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 make-up lecture 12:30
HW #4 due
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22
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23
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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
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25
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26
lecture 18
Weak potential approximation and the band gap, velocity of electron at a Bragg plane, metals and insulators
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27
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28
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29
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