# Absorption coefficient of quantum well

1. May 8, 2012

### equation M

we know that the quantum well absorption coefficient is calculated by summing over the electron-heavy hole and electron-light hole transitions:

α$_{w}$(E) = $\sum_{n}α$$_{e_{n}-hh_{n}}$(E) + $\sum_{n}α$$_{e_{n}-lh_{n}}$(E)

where n is the n$^{th}$ transistion.

but when the photon flux is incident on the QW, the absorption spectrum becomes continuous rather than discrete as all the photons above a certain level of energy will be absorbed in the well. Am I right?