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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2630
DTSTART:20120326T213000Z
DURATION:PT1H0M0S
DTSTAMP:20240319T063548Z
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
g2 (Λ/T) behavior up to leading contributions\, which woul
d seem to give Tc ~ exp (−1/√g)\, g 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/g) 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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