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