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Jan Hendrik Schön,1*Christian Kloc,1Harold Y. Hwang,1Bertram Batlogg12
The electrical properties of organic molecular crystals,
such as polyacenes or C60, can be tuned from insulating to
superconductingby application of an electric field. By structuring the
gate electrodeof such a field-effect switch, the charge carrier
density, andtherefore also the superfluid density, can be modulated.
Hence,weak links that behave like Josephson junctions can be
fabricatedbetween two superconducting regions. The coupling between
thesuperconducting regions can be tuned and controlled over a widerange by the applied gate bias. Such devices might be used insuperconducting circuits, and they are a useful scientific toolto
study superconducting material parameters, such as the superconductinggap, 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
