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PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-9368
DTSTART:20251120T160000Z
DTEND:20251121T000000Z
DTSTAMP:20260413T102708Z
LAST-MODIFIED:20251014T050425Z
LOCATION:5310 Chamberlin
SUMMARY:Disorder-induced fractionalization of pair density waves\, R. 
 G. Herb Condensed Matter Seminar\, Julian May-Mann\, Stanford Universi
 ty
DESCRIPTION:Pair-density waves (PDWs) are unconventional superconducto
 rs in which the order parameter periodically oscillates in space. Comp
 ared to other superconductors\, PDWs are particularly susceptible to d
 isorder\, since random impurities can disrupt the periodic structure t
 hat defines them. However\, it is not clear whether disorder completel
 y destroys the PDW or instead gives rise to a new phase. Here\, we sho
 w that a new phase can indeed arise\, by considering a strongly inhomo
 geneous limit in which the system consists of a random collection of P
 DW puddles embedded in a metallic background*. When the puddles are di
 lute\, they become phase coherent at low temperatures\, resulting in a
  state that is macroscopically equivalent to an s-wave superconductor.
  This can be viewed as an example of order-parameter fractionalization
 \, in which the PDW order splits into an s-wave superconducting compon
 ent and a charge-density-wave component\, the latter of which is destr
 oyed by disorder. This result highlights the unexpected robustness of 
 superconductivity in PDWs and provides new insights into the effects o
 f disorder on d-wave superconductors.
URL:https://www.physics.wisc.edu/events/?id=9368
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