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

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dc.creatorNakaoka, T.
dc.creatorKrenner, H. J.
dc.creatorClark, E. C.
dc.creatorSabathil, M.
dc.creatorBichler, M.
dc.creatorArakawa, Y.
dc.creatorAbstreiter, G.
dc.creatorFinley, J. J.
dc.date2006-07-03
dc.date.accessioned2026-07-07T08:34:49Z
dc.date.available2026-07-07T08:34:49Z
dc.descriptionWe 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 $ΔE\$ ~3-6 meV.
dc.description6 pages, 4 figures, submitted for publication
dc.identifierhttps://arxiv.org/abs/cond-mat/0607023
dc.identifierhttp://arxiv.org/abs/cond-mat/0607023
dc.identifierPhys. Rev. B 74, 121305 (2006)
dc.identifierdoi:10.1103/PhysRevB.74.121305
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/139567
dc.subjectMesoscale and Nanoscale Physics
dc.subjectOptics
dc.titleDirect observation of acoustic phonon mediated relaxation between coupled exciton states in a single quantum dot molecule
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