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Condensed Matter Seminars

ics Condensed Matter
Thursday, March 30, 2006
4:00 PM
Physics Building, Room 204
Note special time.
Note special room.
Gil Refael [Host: Victor Galitski]
Caltech
"Fate of the Josephson Effect in Thin-film Superconductors"
ABSTRACT:
The dc Josephson effect is a probe of the fundamental nature of the superconducting state. In this talk, I will analyze the case of two superconducting thin films connected by a point contact. Remarkably, the Josephson effect is absent at nonzero temperature, even below the K-T transition of the films, and the resistance across the contact is nonzero. Moreover, the point contact resistance is found to vary with temperature in a nearly activated fashion, with a universal energy barrier determined only by the superfluid stiffness characterizing the films, an angle characterizing the geometry, and whether or not the Coulomb interaction between Cooper pairs is screened. As will be shown, this should be testable even in finite systems at a proper range of length-scales and temperatures.

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