Spatially resolved scanning tunneling spectroscopy on single-walled carbon nanotubes

L. Venema, J. Janssen, M. Buitelaar, J. Wildöer, S. Lemay, L. Kouwenhoven, C. Dekker

Research output: Contribution to journalArticleAcademicpeer-review

113 Citations (Scopus)

Abstract

Scanning tunneling microscope spectroscopy is used to study in detail the electronic band structure of carbon nanotubes as well as to locally investigate electronic features of interesting topological sites such as nanotube ends and bends. From a large number of measurements of the tunneling density-of-states (DOS) nanotubes can be classified, according to predictions, as either semiconducting (two-third of the total number of tubes) or metallic (one-third). The energy subband separations in the tunneling DOS compare reasonably well to theoretical calculations. At nanotube ends, spatially resolved spectra show additional sharp conductance peaks that shift in energy as a function of position. Spectroscopy measurements on a nanotube kink suggest that the kink is a heterojunction between a semiconducting and a metallic nanotube.

Original languageEnglish
Pages (from-to)5238-5244
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume62
Issue number8
DOIs
Publication statusPublished - 2000
Externally publishedYes

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