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Condensed Matter Seminars
| Condensed Matter
Thursday, April 16, 2009
Physics Building, Room 204
Note special time.
Note special room.
[Host: Israel Klich ]
"The thin film Giaever transformer - vortex drag in a superconductor thin-film bilayer "
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.
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