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
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