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We study the electronic coupling between two vertically stacked InAs quantumdots, which are embedded in the center of a n-i-n structure. We use amicro-photoluminescence setup to optically isolate a single quantum dot pairand measure the time-averaged photoluminescence under an applied verticalelectric field. We find that field tunable coupling between excited states ofthe two quantum dots leads to charge transfer from one dot to the other. Wemodel the spectra including simultaneously the field dependent charge transferand exciton capture rates, and the many-body spectra of the quantum dotmolecule for different carrier configurations.Comment: 8 pages, 5 figure

Photoluminescence of a single InAs quantum dot molecule under applied electric field