Single-Electron Transport in Ropes of Carbon Nanotubes

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Science  28 Mar 1997:
Vol. 275, Issue 5308, pp. 1922-1925
DOI: 10.1126/science.275.5308.1922

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The electrical properties of individual bundles, or “ropes,” of single-walled carbon nanotubes have been measured. Below about 10 kelvin, the low-bias conductance was suppressed for voltages less than a few millivolts. In addition, dramatic peaks were observed in the conductance as a function of a gate voltage that modulated the number of electrons in the rope. These results are interpreted in terms of single-electron charging and resonant tunneling through the quantized energy levels of the nanotubes composing the rope.

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