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Published May 11, 2000 | public
Journal Article

Josephson Coupled Quantum Dot Artificial Solids


Josephson coupled quantum dot artificial solids were prepared from 20 ± 4 nm diameter organically functionalized Pb particles. Interparticle separation distances were varied from approximately 26 to 11 Å by varying the passivating organic ligand. Isolated particles were too small to exhibit a Meisner effect by themselves, and so it was possible to employ SQUID magnetometry as a zero-background probe for Cooper pair delocalization in these solids. As the interparticle separation distance was decreased, the quantum dot solids progressed from a Mott insulator to a strongly localized superfluid, and finally to a superfluid.

Additional Information

© 2000 American Chemical Society. Received 19 January 2000. Published online 14 April 2000. Published in print 1 May 2000. We would like to acknowledge Prof. S. Kivelson for helpful discussions, and we would like to acknowledge Dr. Chris Murray for early advice on Pb nanocrystal synthesis routes. This work was funded by the National Science Foundation.

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