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.