Simultaneous electrical transport and scanning tunneling spectroscopy of carbon nanotubes

Brian J. LeRoy*, Iddo Heller, Vijay K. Pahilwani, Cees Dekker, Serge G. Lemay

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

18 Citations (Scopus)


We performed scanning tunneling spectroscopy measurements on suspended single-walled carbon nanotubes with independently addressable source and drain electrodes in the Coulomb blockade regime. This three-terminal configuration allows the resistance to the source and drain electrodes to be individually measured, which we exploit to demonstrate that electrons were added to spin-degenerate states of the carbon nanotube. Unexpectedly, the Coulomb peaks also showed a strong spatial dependence. By performing simultaneous scanning tunneling spectroscopy and electrical transport measurements we show that the probed states are extended between the source and drain electrodes. This indicates that the observed spatial dependence reflects a modulation of the contact resistance.

Original languageEnglish
Pages (from-to)2938-2941
Number of pages4
JournalNano letters
Issue number10
Publication statusPublished - Oct 2007
Externally publishedYes


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