The optical quantum-confined Stark effect and infrared-induced quenching in the emission spectra of quantum wells

We study the optical quantum-confined Stark effect in the emission spectra of a symmetric quantum well coherently coupled by an infrared laser. It is shown that this effect is dynamically affected by the layer interface fluct uations and other defects, causing a field-dependent quenching of the emiss ion spectra. We discuss how at low carrier densities the quenching process can be attributed to the intraband transitions between the populated excito n states and at high carrier densities to those between the conduction subb ands.