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Phys. Rev. Lett. 95, 197401 (2005) [4 pages]

Exponential Decay Lifetimes of Excitons in Individual Single-Walled Carbon Nanotubes

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Axel Hagen3, Mathias Steiner1, Markus B. Raschke2, Christoph Lienau2, Tobias Hertel4, Huihong Qian1, Alfred J. Meixner1, and Achim Hartschuh1,*
1Department of Physical Chemistry, Universität Siegen, 57068 Siegen, Germany
2Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, 12489 Berlin, Germany
3Department of Physical Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, 12489 Berlin, Germany
4Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA

Received 13 April 2005; published 31 October 2005

The dynamics of excitons in individual semiconducting single-walled carbon nanotubes was studied using time-resolved photoluminescence (PL) spectroscopy. The PL decay from tubes of the same (n,m) type was found to be monoexponential, however, with lifetimes varying between less than 20 and 200 ps from tube to tube. Competition of nonradiative decay of excitons is facilitated by a thermally activated process, most likely a transition to a low-lying optically inactive trap state that is promoted by a low-frequency phonon mode.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.197401
DOI:
10.1103/PhysRevLett.95.197401
PACS:
78.67.Ch, 78.47.+p, 78.55.−m

*Electronic address: achim.hartschuh@uni-tuebingen.de

 
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