Abstract
It is shown that the one-photon absorption edge in direct-gap crystals predicted by the Keldysh formula agrees with the results of conventional perturbation theory to within a factor of order unity. This is in contrast to the frequently stated opinion that the Keldysh formula is incorrect or invalid when the photon multiplicity is small.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have