Thermoelectric Power of Single-Walled Carbon Nanotubes

Phys. Rev. Lett. 80, 1042 – Published 2 February 1998
J. Hone, I. Ellwood, M. Muno, Ari Mizel, Marvin L. Cohen, A. Zettl, Andrew G. Rinzler, and R. E. Smalley

Abstract

We have measured the temperature-dependent thermoelectric power (TEP) of crystalline ropes of single-walled carbon nanotubes. The TEP is large and holelike at high temperatures and approaches zero as T0. The results argue against the opening of a gap at low temperature in these materials. When derived from a simple band structure picture, the TEP of a single metallic nanotube is significantly lower than the measured TEP, strongly suggesting that the predicted electron-hole symmetry of metallic nanotubes is broken when the tubes self-assemble into ropes. Different models for the symmetry breaking are considered.

DOI: http://dx.doi.org/10.1103/PhysRevLett.80.1042

  • Received 19 June 1997
  • Published in the issue dated 2 February 1998

© 1998 The American Physical Society

Authors & Affiliations

J. Hone, I. Ellwood, M. Muno, Ari Mizel, Marvin L. Cohen, and A. Zettl

  • Department of Physics, University of California at Berkeley, Berkeley, California 94720,
  • and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720

Andrew G. Rinzler and R. E. Smalley

  • Center for Nanoscale Science and Technology, Rice Quantum Institute, Houston, Texas 77721,
  • and Departments of Chemistry and Physics, MS-100, Rice University, Houston, Texas 77721

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