Departmental Papers (MSE)

Document Type

Journal Article

Date of this Version

February 2003

Comments

Postprint version. Copyright American Physical Society. Published in Physical Review Letters, Volume 90, Issue 6, Article 065503, February 14, 2003, pages 87-93.
Publisher URL: http://dx.doi.org/10.1103/PhysRevlett.90.065503

Abstract

We 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.

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Date Posted: 02 February 2005

This document has been peer reviewed.