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13 nm Exciton Size in (6,5) Single-Wall Carbon Nanotubes

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    13 nm Exciton Size in (6,5) Single-Wall Carbon Nanotubes
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    † ‡ †Institute of Physical and Theoretical Chemistry and ‡Röntgen Research Center for Complex Material Systems, Julius-Maximilian University Würzburg, 97074 Würzburg, Germany
    *E-mail: [email protected]. Phone: +49 931 318 6300.
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    The Journal of Physical Chemistry Letters

    Cite this: J. Phys. Chem. Lett. 2016, 7, 12, 2276–2280
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    https://doi.org/10.1021/acs.jpclett.6b00797
    Published June 1, 2016
    Copyright © 2016 American Chemical Society
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    Abstract

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    Electron–hole correlation lengths, also termed exciton size, for (6,5) single-wall carbon nanotubes (SWNTs) are determined using femtosecond time-resolved pump–probe spectroscopy. The phase space filling model is used to obtain the sizes of the first subband exciton in samples of isolated and of bundled SWNTs. The experiments indicate that the exciton size of (13 ± 3) nm is a factor of 6 higher than previous experimental estimates and theoretical predictions for vacuum suspended SWNTs. This surprising result may be attributed at least in part to the effect of the dielectric environment on exciton sizes and supports recent theoretical findings predicting that screening in SWNTs may enhance rather than reduce electron–hole interactions for separations larger than the tube diameter. Thereby, the work also points to the unique nature of screening and electronic correlations in one-dimensional semiconductors.

    Copyright © 2016 American Chemical Society

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    The Journal of Physical Chemistry Letters

    Cite this: J. Phys. Chem. Lett. 2016, 7, 12, 2276–2280
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.jpclett.6b00797
    Published June 1, 2016
    Copyright © 2016 American Chemical Society
    Request reuse permissions

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