title: Thermoelectric power of p-doped single-wall carbon nanotubes and the role of phonon drag.
abstract: We measured thermoelectric power S of bulk single-wall carbon nanotube materials p doped with acids. In contrast to oxygen-exposed or degassed samples, S is very small at the lowest temperatures, increases superlinearly above a characteristic and sample-dependent T, 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 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.
authors.affiliation: Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272, USA.
authors.forename: J
authors.initials: J
authors.lastname: Vavro
authors.forename: M C
authors.initials: MC
authors.lastname: Llaguno
authors.forename: J E
authors.initials: JE
authors.lastname: Fischer
authors.forename: S
authors.initials: S
authors.lastname: Ramesh
authors.forename: R K
authors.initials: RK
authors.lastname: Saini
authors.forename: L M
authors.initials: LM
authors.lastname: Ericson
authors.forename: V A
authors.initials: VA
authors.lastname: Davis
authors.forename: R H
authors.initials: RH
authors.lastname: Hauge
authors.forename: M
authors.initials: M
authors.lastname: Pasquali
authors.forename: R E
authors.initials: RE
authors.lastname: Smalley