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Condensed Matter Seminars

ics Condensed Matter
Thursday, April 16, 2009
4:00 PM
Physics Building, Room 204
Note special time.
Note special room.
Gil Refael [Host: Israel Klich ]
Caltech
"The thin film Giaever transformer - vortex drag in a superconductor thin-film bilayer "
 
 Slideshow (PDF)
ABSTRACT:
The normal-field induced superconductor-insulator transition in amorphous thin films, and the possible intervening metallic state, can be qualitatively explained within two paradigms: as vortex condensation, or as a percolation transition between the competing normal and superconducting phases. An experiment that may qualitatively distinguish these two paradigms is a drag experiment on a bilayer system, consisting of two parallel films, where a voltage response in one layer to current in the other is measured. The drag due to vortices is expected to dramatically exceed the Coulomb drag that may arise from the charge carriers in the percolation scenario. In my talk, I will present recent results estimating the drag response within the vortex and percolation paradigms, in the limit of no tunneling between the layers.
SLIDESHOW:

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