- #1
hokhani
- 488
- 8
In an indirect transition from the valence band maximum to conduction band minimum, the momentum of electron and hole would not change but the crystal momentum would change and this change is supplied by phonons.I have two questions here:
1) phonons don't carry momentum so how they can transfer their momentum to the crystal?
2) phonons are part of the crystal. why do we separate their momentum from crystal momentum?
1) phonons don't carry momentum so how they can transfer their momentum to the crystal?
2) phonons are part of the crystal. why do we separate their momentum from crystal momentum?