A.B. McLean, R.H. Williams
Journal of Physics C: Solid State Physics
Exciton dynamics within the band-edge state manifold of CdSe/ZnS and CdSe/CdS quantum dots (QDs) have been investigated. Low-temperature time-resolved photoluminescence (PL) experiments demonstrate that exciton relaxation is mediated by LO phonons, whereas an acoustic phonon bottleneck is observed for splitting energies lower than the optical phonon energy. This has important implications since the main source affecting exciton dephasing is considered to be a spin-flip process. Our results concur with recent observations of long exciton dephasing times in CdSe/CdS QDs and show a way to engineer nanoparticles with enhanced coherence time, a prerequisite for their use in quantum optical applications. © 2012 American Chemical Society.
A.B. McLean, R.H. Williams
Journal of Physics C: Solid State Physics
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Micro and Nano Engineering
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Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures
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Inorganic Chemistry