Resonances in the excitonic transfer in biased double quantum wells

We report evidence of resonances in the assisted transfer of excitons in a biased asymmetrical GaAs-(Ga,Al)As double quantum well. The excitonic transfers, i.e., the conversions of a ``direct'' exciton into a ``crossed'' one, are such that the initial and final hole locations are identical but the electron locations are different before and after the transfer. The calculated excitonic energies and transfer times provide a good description of the energy locations and intensities of the photoluminescence lines.