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We probe acoustic phonon mediated relaxation between tunnel coupled excitonstates in an individual quantum dot molecule in which the inter-dot quantumcoupling and energy separation between exciton states is continuously tunedusing static electric field. Time resolved and temperature dependent opticalspectroscopy are used to probe inter-level relaxation around the point ofmaximum coupling. The radiative lifetimes of the coupled excitonic states canbe tuned from ~2 ns to ~10 ns as the spatially direct and indirect character ofthe wavefunction is varied by detuning from resonance. Acoustic phonon mediatedinter-level relaxation is shown to proceed over timescales comparable to thedirect exciton radiative lifetime, indicative of a relaxation bottleneck forlevel spacings in the range $\Delta E\$ ~3-6 meV.Comment: 6 pages, 4 figures, submitted for publicatio

Direct observation of acoustic phonon mediated relaxation between coupled exciton states in a single quantum dot molecule