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Proceedings Paper

Ultrafast intraband relaxation in colloidal quantum dots
Author(s): J. J. H. Pijpers; E. Hendry; M. Bonn
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Paper Abstract

We independently determine the subpicosecond cooling rates for holes and electrons in CdSe quantum dots using time-resolved luminescence and time-resolved TeraHertz spectroscopy. The rate of hole cooling, following photoexcitation of the quantum dots, depends critically on the electron excess energy. This constitutes a direct proof 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. This is only marginally slower than the timescale of intraband relaxation of electrons in single crystal CdSe. In bulk CdSe, sequential multi-phonon emission allows for cooling rates of (0.4 ps)-1 at room temperature.

Paper Details

Date Published: 14 February 2008
PDF: 12 pages
Proc. SPIE 6892, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII, 68921H (14 February 2008); doi: 10.1117/12.761665
Show Author Affiliations
J. J. H. Pijpers, FOM Institute for Atomic and Molecular Physics (Netherlands)
E. Hendry, Univ. of Exeter (United Kingdom)
M. Bonn, FOM Institute for Atomic and Molecular Physics (Netherlands)


Published in SPIE Proceedings Vol. 6892:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII
Jin-Joo Song; Kong-Thon Tsen; Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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