# Tag Info

### What is it about the "conduction band" of a material that is distinct from the valence band?

A band is essentially a (near) continuous collection of momentum eigenstates. Within the band the electrons can be treated as free to a reasonable approximation, so their eigenstates are just plane ...
• 330k
Accepted

• 37.4k

### Reverse bias P-N junction

Think about why the diode does conduct current when it is forward-biased. In that case, there is an electric field pointing from the P-type end to the N-type end. Negative electrons want to climb up ...
• 70.2k

### Floquet and Bloch's theorems : connection?

No worries about the order of the differential equation. You can always transform a second or higher order equation to a system of first order differential equations. The Bloch theorem is dealing ...
• 156