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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-8676
DTSTART:20240318T170000Z
DTEND:20240318T180000Z
DTSTAMP:20260413T223528Z
LAST-MODIFIED:20240308T174126Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Quantum skyrmion Hall effect\, R. G. Herb Condensed Matter Sem
 inar\, Ashely Cook\, Max Planck Institutes for the Physics of Complex 
 Systems and the Chemical Physics of Solids
DESCRIPTION:In the quantum Hall effect\, a two-dimensional gas of elec
 trons is subjected to an out-of-plane magnetic field and electron tran
 sport quantises: the Hall conductivity plateaus at values proportional
  to integers and rational numbers in units of fundamental constants\, 
 with remarkably low error. Shortly after experimental discovery of the
  quantum Hall effect in 1980\, theorists developed a framework explain
 ing this quantization as a consequence of topological phases of matter
 \, or those phases with signatures unaffected by sufficiently small pe
 rturbations. In particular\, a theory in terms of point charges coupli
 ng to external fields beautifully described this physics. A great vari
 ety of topological phases have been classified as a consequence of dis
 covery of the quantum Hall effect\, but this work has recently led to 
 discovery of topological skyrmion phases of matter\, multiplicative to
 pological phases of matter\, and finite-size topological phases of mat
 ter\, which contradict key assumptions of established classification s
 chemes. The discovery of these three sets of topological states necess
 itates a paradigm shift from the quantum Hall effect framework to that
  of the quantum skyrmion Hall effect\, in which the point charges of t
 he quantum Hall effect are generalised to truly quantum counterparts o
 f topological textures in observable fields\, called skyrmions.
URL:https://www.physics.wisc.edu/events/?id=8676
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