Question

Explain what is meant by the extended, repeated and reduced zone schemes. (This is Solid State Physics Problem)

Answer 1

Actually, we know that about the zones in solid state..

1).The reduced zone scheme is the representation of all energy bands within the 1st Brillouin zone.

2.) Beyond the reduced zone is knot as repeated zone scheme..

3.) The extended zone scheme, which shows different bands in different Brillouin zones, with discontinuities at zone edges.

Figure Extended zone scheme...