Simultaneous Electrical Transport and Scanning Tunneling Spectroscopy of Carbon Nanotubes

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• 作者：Brian J. LeRoy ; Iddo Heller ; Vijay K. Pahilwani ; Cees Dekker ; Serge G. Lemay
• 刊名：Nano Letters
• 出版年：2007
• 出版时间：October 2007
• 年：2007
• 卷：7
• 期：10
• 页码：2937 - 2941
• 全文大小：320K
• 年卷期：v.7,no.10(October 2007)
• ISSN：1530-6992

文摘

We performed scanning tunneling spectroscopy measurements on suspended single-walled carbon nanotubes with independently addressablesource and drain electrodes in the Coulomb blockade regime. This three-terminal configuration allows the resistance to the source and drainelectrodes to be individually measured, which we exploit to demonstrate that electrons were added to spin-degenerate states of the carbonnanotube. Unexpectedly, the Coulomb peaks also showed a strong spatial dependence. By performing simultaneous scanning tunnelingspectroscopy 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.