Report

Gate-Controlled Superconducting Proximity Effect in Carbon Nanotubes

See allHide authors and affiliations

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

You are currently viewing the abstract.

View Full Text

Log in to view the full text

Log in through your institution

Log in through your institution

Abstract

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}leland.stanford.edu, cmarcus{at}stanford.edu

View Full Text