Gate-Controlled Superconducting Proximity Effect in Carbon Nanotubes

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Science  08 Oct 1999:
Vol. 286, Issue 5438, pp. 263-265
DOI: 10.1126/science.286.5438.263

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The superconducting proximity effect in single-walled carbon nanotubes connected to niobium electrodes was controlled with the use of nearby gates that tune the niobium-nanotube transparency. At 4.2 kelvin, when the transparency was tuned to be high, a dip in the low-bias differential resistance was observed, indicating a proximity effect mediated by Andreev reflection. When the transparency was tuned to be low, signatures of Andreev reflection disappeared and only tunneling conduction was observed. Below ∼4 kelvin, a narrow peak in differential resistance around zero bias appeared superimposed on the Andreev dip, probably as a result of electron-electron interaction competing with the proximity effect.

  • * To whom correspondence should be addressed. E-mail: morpurg1{at}, cmarcus{at}

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