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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-8262
DTSTART:20230420T210000Z
DTEND:20230420T220000Z
DTSTAMP:20260414T052934Z
LAST-MODIFIED:20230413T204111Z
LOCATION:5310 Chamberlin
SUMMARY:Disorder in the Kitaev Spin Liquid\, Graduate Program Event\, 
 Wen-Han Kao\, PhD graduate student in Physics at Univ of Minnesota
DESCRIPTION:One of the long-standing open questions that recently attr
 acted much attention is understanding how a quantum spin liquid (QSL) 
 state responds to various forms of structural disorder that are inevit
 able in real materials. In the candidate compounds of the Kitaev spin 
 liquid (KSL) system\, it has been noted that quenched disorder plays a
  role in suppressing the long-range magnetic order but also makes the 
 low-energy excitations puzzling. In my talk\, I will introduce how the
  presence of vacancies and bond randomness modifies the density of sta
 tes of Majorana fermion\, which is one kind of fractionalized excitati
 on of KSL. In the site-diluted model\, the pileup of low-energy states
  leads to divergent specific heat\, and the flux-sector crossover unde
 r magnetic fields provides an explanation for the puzzling experimenta
 l findings of a strong candidate material H3LiIr2O6. We also explored 
 how the fractionalized degrees of freedom renormalize in the strong-di
 sorder limit of bond randomness. Namely\, we applied the strong-disord
 er renormalization group (SDRG) on the KSL system and found that stron
 g-disorder criticality can appear differently on distinct fractionaliz
 ed excitations. This points out further inquiries about the quenched d
 isorder effects in frustrated magnetism.
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\nhttps://sites.google.com
 /view/wenhankao/research?authuser=0
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URL:https://www.physics.wisc.edu/events/?id=8262
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