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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-9823
DTSTART:20260924T150000Z
DTEND:20260924T160000Z
DTSTAMP:20261015T133721Z
LAST-MODIFIED:20260922T022232Z
LOCATION:Chamberlin 5310
SUMMARY:Emergent Clock Order and Giant Magnetoelectricity in van der W
 aals Magnets\, R. G. Herb Condensed Matter Seminar\, Frank Gao\, UW-Ma
 dison Chemistry
DESCRIPTION:Van der Waals magnets provide a fertile setting in which r
 educed dimensionality\, enhanced fluctuations\, topology\, and strong 
 correlations reshape familiar forms of magnetism. Much of this physics
  is encoded in subtle changes to the magnetic order parameter — its 
 symmetry\, spatial texture\, and coupling to other degrees of freedom 
 — that are difficult to resolve with conventional magnetic probes. H
 ere\, I will show how symmetry-sensitive nonlinear optical microscopy 
 can unveil these hidden orders and follow their dynamics.
\n
\nI will 
 first discuss NiPS3\, where we use second-harmonic generation microsco
 py to show how reduced dimensionality transforms the material’s bulk
  antiferromagnetism\, giving rise to a six-state clock order emerging 
 from a BKT phase in the monolayer limit. I will then turn to the van d
 er Waals multiferroic NiI2\, where chiral magnetism is intimately coup
 led to ferroelectric polarization. By combining complementary electric
 - and magnetic-dipole-sensitive nonequilibrium probes\, we identify te
 rahertz collective modes with an exceptionally large chiral dynamical 
 magnetoelectric response. Beyond their fundamental implications\, thes
 e experiments establish new avenues for engineering and manipulating c
 orrelated spin systems in atomically thin magnets\, with potential app
 lications in spintronics\, quantum sensing\, and light-driven quantum 
 technologies.
URL:https://www.physics.wisc.edu/events/?id=9823
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