Abstract
In superlattices in which the barriers are sufficiently narrow and low, the low-temperature vertical transport of excitons is due to quantum-mechanical tunneling between successive quantum wells (QW).[1] For structures with wide and high barriers [multiple QW’s (MQW)], the interwell coupling is due to the dipole-dipole interaction.[2] The context for treating coherent effects of this sort is exciton-polariton theory.[3] Exciton transport has been of interest in various molecular systems,[4] where the picture is of incoherent Förster transport.[5]. The MQW provides a tailor-made system of which an individual structure can be studied, while data on molecular systems must be frequently interpreted in terms of ensembles. There has been little experimental or theoretical[6] work on this type of vertical transport in MQW’s, although incoherent transport in such structures has been the subject of one study.[7]
© 1995 Optical Society of America
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