Proximity-induced superconductivity in DNA.
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.
Kasumov
A Y
AY
Laboratoire de Physique des Solides, Associé au CNRS, Bât 510, Université Paris-Sud, 91405, Orsay, France.
Kociak
M
M
Guéron
S
S
Reulet
B
B
Volkov
V T
VT
Klinov
D V
DV
Bouchiat
H
H
D004247:DNA / Q000737:chemistry*; D004553:Electric Conductivity; D017097:Electric Impedance; D004563:Electrochemistry; D004566:Electrodes; D018625:Microscopy, Atomic Force; D013696:Temperature
D004247:DNA