- #1
hokhani
- 488
- 8
When an electromagnetic wave is impinged on a semiconductor and we solve the perturbed Hamiltonian by taking into account the vector potential in the momentum term, two terms would add to the unperturbed Hamiltonian which one of them deals with absorption while the other with emission. I like to know whether the emission is made by the incident radiation itself, or first the radiation is absorbed then the excited electron would come back and radiate?