Vavro, JurajLlaguno, Mark CFischer, John ERamesh, SivarajanSaini, Rajesh KEricson, Lars MDavis, Virginia AHauge, Robert HPasquali, MatteoSmalley, Richard E2023-05-232023-05-232003-02-142005-01-20https://repository.upenn.edu/handle/20.500.14332/41124We measured thermoelectric power S of bulk single-wall carbon nanotube (SWNT) materials p-doped with acids. In contrast to oxygen-exposed or degassed samples, S is very small at the lowest temperatures, increases super-linearly above a characteristic and sample-dependent T, and then levels off. We attribute this unusual behavior to 1-D phonon drag, in which the depression of the Fermi energy cuts off electron-phonon scattering at temperatures below a characteristic T0. 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.Article