Harvard Condensed Matter Theory Seminars

David Pekker, University of Illinois, Urbana-Champaign

Superconductivity on the Nanoscale: Quantum Interference Devices Made of Superconducting Nanowires

Recent advances have made it possible to fabricate nano-scale superconducting circuits by the metal coating of individual molecules. These advances in nano-fabrication are important both for technology and because they allow the investigation of new physical phenomena. In this talk, I shall describe an all-superconducting nano-scale quantum interference device consisting of two nanowires connecting a pair of thin-film leads, which we have investigated in collaboration with Alexey Bezryadin's group. In particular, I shall describe how the resistance of the nanowires is sensitive to order-parameter phases in the leads which can, in turn, be controlled by magnetic fields, supercurrents, and vortices in the leads.

Hopkins, Pekker, Goldbart, and Bezryadin "Quantum Interference Device Made by DNA Templating of Superconducting Nanowires," Science 17 June 2005, 308
Pekker, Bezryadin, Hopkins, and Goldbart "Operation of a superconducting nanowire quantum interference device with mesoscopic leads," Phys. Rev. B 72, 104517 (2005).

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