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Unusual Raman dispersion for D and 2D lines in high-curvature single-walled carbon nanotubes revealed by C-13 isotope substitution

Research output: Contribution to journalJournal article

Published

  • F. Simon
  • V. Zolyomi
  • R. Pfeiffer
  • H. Kuzmany
  • J. Koltai
  • J. Kurti
Article number125434
<mark>Journal publication date</mark>1/03/2010
<mark>Journal</mark>Physical review b
Issue12
Volume81
Number of pages5
<mark>Original language</mark>English

Abstract

The defect-induced D line and its overtone are fundamental signatures in the Raman spectra of carbon nanomaterials. An analysis of these lines as a function of laser excitation energy is reported for double-walled carbon nanotubes where the inner tubes represent high-curvature nanotube species. From 13C substituted inner tubes it is demonstrated that the quasilinear relations between laser energy and line position (Raman dispersion) cross over unexpectedly for low-energy excitation for the inner and outer tube shells. The result is quantitatively explained by a curvature-induced phonon softening and first-principles calculations of the optical transition energies.

Bibliographic note

© 2010 The American Physical Society