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Friday, February 21, 2003
Physics Building, Room 204
Note special time.
[Host: Jongsoo Yoon]
"The Illusive Bose Metal"
Cooper pairs (bosons) are thought to exist in two quite distinct ground
1) localized in a Mott insulator or 2) condensed in a superconductor.
However,recent experiments on 2D insulator-superconductor transitions
that there may be a third possibility: a metal with a finite resistivity
at zero temperature. I will review the standard theoretical framework
used to understand the insulator-superconductor transition, the recent
results and I will show quite generally how bosons lacking phase
coherence can form
a metal in the presence of disorder rather than an insulating phase.
The metallic state is rather weird,
however. The phase degrees of freedom are glassy. At the heart of the
metallic state is the dissipation inherent in the glassy state.
Bosons moving in such
a glassy environment fail to localise because no true ground state
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