Volume 90, Number 1, June 2010
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||03 May 2010|
Incidence of the Tomonaga-Luttinger liquid state on the NMR spin-lattice relaxation in carbon nanotubes
Laboratoire de Physique des Solides, Université Paris-Sud 11, CNRS UMR 8502 - 91405 Orsay, France, EU
2 IFW Dresden - P.O. Box 270116, D-01171 Dresden, Germany, EU
3 University of Vienna, Faculty of Physics - Strudlhofgasse 4, A-1090 Wien, Austria, EU
4 Budapest University of Technology and Economics, Institute of Physics - H-1521 Budapest, Hungary, EU
Corresponding author: firstname.lastname@example.org
Accepted: 29 March 2010
We report 13C nuclear magnetic resonance measurements on 13C-enriched single-wall carbon nanotube (SWCNT) bundles. The temperature dependence of the nuclear spin-lattice relaxation rate, 1/T1, exhibits a power law variation, as expected for a Tomonaga-Luttinger liquid (TLL). The observed exponent is smaller than that expected for the two-band TLL model. A departure from the power law is observed only at low T, where thermal and electronic Zeeman energy merge. Extrapolation to zero magnetic field indicates gapless spin excitations. The wide T range on which power law behaviour is observed suggests that SWCNT is so far the best realization of a one-dimensional quantum metal.
PACS: 71.10.Pm – Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.) / 73.22.-f – Electronic structure of nanoscale materials and related systems / 76.60.-k – Nuclear magnetic resonance and relaxation
© EPLA, 2010
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