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Spatially indirect excitons in semiconducting double quantum wells have beenshown to exhibit rich collective many-body behavior that result from the natureof the extended dipole-dipole interactions between particles. For manyspectroscopic studies of the emission from a system of such indirect excitons,it is crucial to separate the single particle properties of the excitons fromthe many-body effects arising from their mutual interactions. In particular,knowledge of the relation between the emission energy of indirect excitons andtheir radiative lifetime could be highly beneficial for control, manipulation,and analysis of such systems. Here we study a simple analytic approximaterelation between the radiative lifetime of indirect excitons and their emissionenergy. We show, both numerically and experimentally, the validity and thelimits of this approximate relation. This relation between the emission energyand the lifetime of indirect excitons can be used to tune and determine theirlifetime and their resulting dynamics without the need of directly measuringit, and as a tool for design of indirect exciton based devices.

Radiative lifetimes of dipolar excitons in double quantum-wells