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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2630
DTSTART:20120326T213000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T120718Z
LAST-MODIFIED:20120321T163413Z
LOCATION:5310 Chamberlin
SUMMARY:Superconducting Instabilities in Cuprates Mediated by Spin Den
 sity Wave Order at Quantum Criticality\, Condensed Matter Theory Group
  Seminar\, Yuxuan Wang\, UW-Madison
DESCRIPTION:I will start with the introduction of the model and its un
 iqueness near quantum criticality\, especially\, its distinction with 
 BCS-type theories. I will use a solved example in a specific temperatu
 re scale to show how in this case perturbation theory fails to account
  for the critical temperature of the system. Next I will demonstrate t
 hat in another temperature scale the superconducting vertex shows a lo
 g<sup>2</sup> (Λ/T) behavior up to leading contributions\, which woul
 d seem to give T<sub>c</sub> ~ exp (−1/√<i>g</i>)\, <i>g</i> being
  the coupling. I will then present how this problem again cannot be pr
 operly addressed by counting leading contributions in each order of pe
 rturbation theory. Theoretical and numerical investigations are then u
 sed to show the actual exp (−1/<i>g</i>) behavior of the critical te
 mperature. Finally by looking at the full problem\, I will talk about 
 the conditions at which each temperature scale takes dominance\, and w
 hat one can learn from studying the models at these specific temperatu
 re scales.
URL:https://www.physics.wisc.edu/events/?id=2630
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