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Direct Observation of Electron-to-Hole Energy Transfer in CdSe Quantum Dots
de Mello Donegá, C.
University of Exeter (at the time of publication Euan Hendry was affiliated to Leiden University and FOM Institute for Atomic and Molecular Physics); Leiden University; Columbia University; University of Amsterdam; Utrecht University
Physical Review Letters
American Physical Society
We independently determine the subpicosecond cooling rates for holes and electrons in CdSe quantum dots. Time-resolved luminescence and terahertz spectroscopy reveal that the rate of hole cooling, following photoexcitation of the quantum dots, depends critically on the electron excess energy. This constitutes the first direct, quantitative measurement of electron-to-hole energy transfer, the hypothesis behind the Auger cooling mechanism proposed in quantum dots, which is found to occur on a 1±0.15 ps time scale.
Euan Hendry, Mattijs Koeberg, F. Wang, H. Zhang, C. de Mello Donegá, D. Vanmaekelbergh, and Mischa Bonn, Physical Review Letters, Vol. 96, article 057408 (2006). "Copyright © 2006 by the American Physical Society."
96 (5), article 057408