Abstract
The electron-phonon coupling constant of carbon nanotubes is much smaller than that of alkali-metal-doped crystals . This difference may be due to the shape of the -electron conjugated system: the former has a flat, whereas the latter has a sphere. In order to confirm the shape effects in , we have examined the magnitude of for a one-dimensional (1D) uneven peanut-shaped polymer that has an intermediate shape of the -electron conjugated system between a carbon nanotube and a system, using femtosecond (fs) time-resolved pump-probe spectroscopy, because it can be expected to have an intermediate value of between them. Theoretical analysis of fs-transient refractivity obtained experimentally found the magnitude of of the 1D polymer film to be 0.02 as our expectation. This indicates that the shape of the -electron conjugated system affects the magnitude of for nanocarbon allotropes significantly.
- Received 8 April 2014
- Revised 3 September 2014
DOI:https://doi.org/10.1103/PhysRevB.90.155435
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