Notes from first repetition session 19.05.2003


The lattice  basics: Wigner Seits cells. The lattice vectors etc


 
Reciprocal lattice. Wigner Seits cell - Brilloin zone in 1 dimension.
The big dots are reciprocal lattice points....




Illustrating that heat capacity of electrons will become important
for low temperatures. It is linear in T, lattice goes as T3




Phase velocity - group velocity. How does the group velocity come arround.