Abstract
By varying two design parameters, e.g., the width of a quantum well (QW) and its chemical composition, or by applying an external field, it is possible to implement two QW's with identical ground-state levels in the conduction band - but different in the valence band. This allows a selective “preparation” of an initial electron state by interband photoexcitation. In a coupled QW system the electron will oscillate between the two wells, giving rise to an oscillating luminescence signal with a period directly related to the tunneling time.
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