Although extensive research on nanostructures has led to thediscovery of a number of efficient ways to confine carriers inreduced dimensions, little has been done to make use of theunique properties of various nanostructured systems throughcoupling by means of the controllable transfer of carriersbetween them. Here, we demonstrate a novel approach forthe controllable transfer of electrons and holes between a semi-conductor quantum well and an embedded quantum dot usingthe moving piezoelectric potential modulation induced by anacoustic phonon. We show that this moving potential not onlycransfers carriers between the quantum well and an array ofquantum dots, but can also control their capture and recombi-nation in discrete quantum dot states within the array. Thisfeature is used to demonstrate a high-frequency, single-photon source with tunable emission energy by acousticallytransferring carriers to a selected quantum dot.
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