Abstract
We measured thermoelectric power of bulk single-wall carbon nanotube materials doped with acids. In contrast to oxygen-exposed or degassed samples, is very small at the lowest temperatures, increases superlinearly above a characteristic and sample-dependent , and then levels off. We attribute this unusual behavior to 1D phonon drag, in which the depression of the Fermi energy cuts off electron-phonon scattering at temperatures below a characteristic . This idea is supported by a model calculation in which the low temperature behavior of phonon drag is specifically related to the one-dimensional character of the electronic spectrum.
- Received 28 May 2002
DOI:https://doi.org/10.1103/PhysRevLett.90.065503
©2003 American Physical Society