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Science 13 April 2001:
Vol. 292. no. 5515, pp. 252 - 254
DOI: 10.1126/science.1058812
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Reports

Josephson Junctions with Tunable Weak Links

Jan Hendrik Schön,1* Christian Kloc,1 Harold Y. Hwang,1 Bertram Batlogg12

The electrical properties of organic molecular crystals, such as polyacenes or C60, can be tuned from insulating to superconducting by application of an electric field. By structuring the gate electrode of such a field-effect switch, the charge carrier density, and therefore also the superfluid density, can be modulated. Hence, weak links that behave like Josephson junctions can be fabricated between two superconducting regions. The coupling between the superconducting regions can be tuned and controlled over a wide range by the applied gate bias. Such devices might be used in superconducting circuits, and they are a useful scientific tool to study superconducting material parameters, such as the superconducting gap, as a function of carrier concentration or transition temperature.

1 Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, NJ 07974-0636, USA.
2 Solid State Physics Laboratory, ETH Hönggerberg, CH-8093 Zürich, Switzerland.
*   To whom correspondence should be addressed. E-mail: hendrik{at}lucent.com

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High-Temperature Superconductivity in Lattice-Expanded C60.
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