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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-9113
DTSTART:20250213T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260413T171613Z
LAST-MODIFIED:20250209T162604Z
LOCATION:5310 Chamberlin
SUMMARY:Past\, present\, and future of Superconducting Diode Effects\,
  R. G. Herb Condensed Matter Seminar\, Daniel Shaffer \, UW-Madison
DESCRIPTION:The critical current in superconducting systems that lack 
 both time reversal and inversion symmetries is generally non-reciproca
 l\, i.e. unequal in magnitude for opposite current flow directions. Th
 is effect — called the superconducting diode effect (SDE) in bulk su
 perconductors and the Josephson diode effect (JDE) in Josephson juncti
 ons — has attracted a lot of attention among both experimentalists a
 nd theorists\, promising many applications for superconducting electro
 nics. Nevertheless\, a proper theoretical description of SDE has been 
 challenging both on the phenomenological and microscopic levels\, even
  for the simplest canonical model of the helical non-centrosymmetric s
 uperconductor with Rashba spin-orbit coupling (SOC) and in-plane magne
 tic field. Despite the relative simplicity of the model\, several conf
 licting results have been obtained in the literature\, including a pre
 diction of the absence of SDE in the weak field limit. In this talk\, 
 I will review some of these controversies and present our resolution\,
  which underscores the subtlety of the effect. Building on this unders
 tanding\, I will also discuss several new microscopic mechanisms that 
 we proposed for realizing or enhancing the SDE in disordered Rashba su
 perconductors\, as well as generic multiphase superconductors like UPt
 3 and UTe2.
URL:https://www.physics.wisc.edu/events/?id=9113
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