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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3280
DTSTART:20140307T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T193431Z
LAST-MODIFIED:20140221T155515Z
LOCATION:Chamberlin Hall
SUMMARY:Experimental review on the disordered-driven superconductor to
  insulator transition\, R. G. Herb Condensed Matter Seminar\, Daniel S
 herman\, Bar-Ilan University\, Ramat-Gan\, Israel
DESCRIPTION:The disorder-driven superconductor to insulator transition
  (SIT) is considered to be a prototype of a quantum phase transition a
 t zero temperature. Lately\, there has been a renewed interest in this
  field due to the experimental observations of a number of dramatic fe
 atures near the SIT of amorphous superconducting materials such as ind
 ium oxide and niobium nitride. These novel features included the simpl
 e activated temperature dependence of the resistance in the insulating
  side\, a large peak in the magneto resistance\, peculiar I-V characte
 ristics and traces of superconductivity at temperatures above Tc. We p
 resent experimental results from tunneling spectroscopy\, Terahertz sp
 ectroscopy and transport measurements that shed light on the physical 
 mechanism governing this phase transition. Our key observations are: 1
  - Superconducting gap in the insulating side of the transition. 2 - A
  possible experimental evidence for collective modes (namely the "Higg
 s" amplitude mode) in such disordered films close to the SIT. 3 - The 
 possibility to tune the quantum phase transition simply by screening t
 he e-e interactions. These results and their possible consequences wil
 l be discussed.
URL:https://www.physics.wisc.edu/events/?id=3280
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