Proximity-Induced Superconductivity in DNA

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Science  12 Jan 2001:
Vol. 291, Issue 5502, pp. 280-282
DOI: 10.1126/science.291.5502.280

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Conductivity measurements on double-stranded DNA molecules deposited by a combing process across a submicron slit between rhenium/carbon metallic contacts reveal conduction to be ohmic between room temperature and 1 kelvin. The resistance per molecule is less than 100 kilohm and varies weakly with temperature. Below the superconducting transition temperature (1 kelvin) of the contacts, proximity-induced superconductivity is observed. These results imply that DNA molecules can be conducting down to millikelvin temperature and that phase coherence is maintained over several hundred nanometers.

  • * Present address: Starlab, La tour de Freins, 555 rue Engeland 1180 Uclle, Brussels, Belgium.

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