Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-07-03
Phys. Rev. B 74, 121305 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 4 figures, submitted for publication
Scientific paper
10.1103/PhysRevB.74.121305
We probe acoustic phonon mediated relaxation between tunnel coupled exciton states in an individual quantum dot molecule in which the inter-dot quantum coupling and energy separation between exciton states is continuously tuned using static electric field. Time resolved and temperature dependent optical spectroscopy are used to probe inter-level relaxation around the point of maximum coupling. The radiative lifetimes of the coupled excitonic states can be tuned from ~2 ns to ~10 ns as the spatially direct and indirect character of the wavefunction is varied by detuning from resonance. Acoustic phonon mediated inter-level relaxation is shown to proceed over timescales comparable to the direct exciton radiative lifetime, indicative of a relaxation bottleneck for level spacings in the range $\Delta E\$ ~3-6 meV.
Abstreiter Gerhard
Arakawa Yasuhiko
Bichler Martin
Clark E. C.
Finley Jonathan J.
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