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Science 17 June 2005:
Vol. 308. no. 5729, pp. 1762 - 1765
DOI: 10.1126/science.1111307
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Reports

Quantum Interference Device Made by DNA Templating of Superconducting Nanowires

David S. Hopkins, David Pekker, Paul M. Goldbart, Alexey Bezryadin*

The application of single molecules as templates for nanodevices is a promising direction for nanotechnology. We used a pair of suspended DNA molecules as templates for superconducting two-nanowire devices. Because the resulting wires are very thin, comparable to the DNA molecules themselves, they are susceptible to thermal fluctuations typical for one-dimensional superconductors and exhibit a nonzero resistance over a broad temperature range. We observed resistance oscillations in these two-nanowire structures that are different from the usual Little-Parks oscillations. Here, we provide a quantitative explanation for the observed quantum interference phenomenon, which takes into account strong phase gradients created in the leads by the applied magnetic field.

Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.

* To whom correspondence should be addressed. E-mail: bezryadi{at}uiuc.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
From the Cover: Generating highly ordered DNA nanostrand arrays.
J. Guan and L. J. Lee (2005)
PNAS 102, 18321-18325
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Science. ISSN 0036-8075 (print), 1095-9203 (online)