8.2.1999 Background: Boltzmann factor (see note) Einstein model for heat capacity (2 notes) Debye model (see note) Copy from Kittel (review of Debye temperatures) (5 sheets of notes) 9.2.1999 Debye model Phonons again Heat conductivity Fourier Law (heat curent) Elementary transport/kinetic theory Expression for heat conductivity Phonon transport (scattering of phonons) (harmonic phonon -> plane wave, infinite) Anharmonic effects Umklapp processes (see the movies) Group velocity Temperature dependence of phonon heat conductivity (see the text) Relation el * sigma * rho = 1 Latex $$\rho \ \sigma \ \ell =1 $$ 15.02.1999 Drude's model Starting the Fermi Gas Model