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Science 8 October 1999:
Vol. 286. no. 5438, pp. 263 - 265
DOI: 10.1126/science.286.5438.263
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Reports
Gate-Controlled Superconducting Proximity Effect in Carbon Nanotubes
A. F. Morpurgo,
1*
J. Kong,
2
C. M. Marcus,
1*
H. Dai
2
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.
1 Department of Physics,
2 Department of Chemistry, Stanford
University, Stanford, CA 94305, USA.
*
To whom correspondence should be addressed. E-mail:
morpurg1{at}leland.stanford.edu, cmarcus{at}stanford.edu
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