BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-8588
DTSTART:20240418T150000Z
DTEND:20240419T040000Z
DTSTAMP:20260413T223348Z
LAST-MODIFIED:20240415T210700Z
LOCATION:5310 Chamberlin
SUMMARY:New twists on topology in moiré quantum matter\, R. G. Herb C
 ondensed Matter Seminar\,  Matthew Yankowitz\, U Washington
DESCRIPTION:Moiré patterns formed by stacking atomically thin van der
  Waals crystals can give rise to
\ndramatic new physical properties\, 
 in select cases generating flat bands that host a variety of intertwin
 ed correlated and topological states of matter. I will discuss two dis
 tinct moiré
\nplatforms that each exhibit their own unique topologica
 l properties. The first is twisted
\nbilayer-trilayer graphene\, in wh
 ich we observe the formation of generalized anomalous Hall
\ncrystals 
 that either triple or quadruple the area of the moiré unit cell. Thes
 e states exhibit a
\nfully-developed integer quantum anomalous Hall ef
 fect\, with a Chern number that can be
\nflipped between +1 and -1 by 
 out-of-plane or in-plane magnetic fields or by an electric
\ndisplacem
 ent field. The second system we study is twisted molybdenum ditellurid
 e (tMoTe 2 )\, which was recently found to host the fractional quantum
  anomalous Hall effect. By probing tMoTe2 on the atomic scale using sc
 anning tunneling microscopy and spectroscopy\, we are able to detect f
 ingerprints of the layer pseudospin skyrmion lattice responsible for g
 enerating the topology of the moiré bands. Our findings showcase the 
 diverse range of novel topological properties that can arise in moiré
  materials.
URL:https://www.physics.wisc.edu/events/?id=8588
END:VEVENT
END:VCALENDAR