Abstract

Recent work in the area of ultrafast nonlinearities resulting from virtual carriers (VC’s) in semiconductor heterostructures has generated significant interest among researchers. It has been shown¹ that excitons in quantum wells (QW’s) behave much like conventional two-level atoms, and, therefore, fast coherent phenomena usually associated with two-level systems may occur in excitonic QW transitions. Indeed, the dynamic (ac) Stark effect in QW’s has been demonstrated.^2-3

© 1991 Optical Society of America