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CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-8161
DTSTART:20230221T160000Z
DTEND:20230222T000000Z
DTSTAMP:20260414T033239Z
LAST-MODIFIED:20230211T025332Z
LOCATION:5310 Chamberlin
SUMMARY:Interacting Opto-Moiré Quantum Matter\, R. G. Herb Condensed 
 Matter Seminar\, Xi Wang\, U Washington
DESCRIPTION:Moiré superlattices of 2D materials are an emerging platf
 orm for studying new physical<br>
\nphenomena with high tunability. St
 rong excitonic responses in Transition Metal Dichalcogenides<br>
\n(TM
 Ds) allow optical access to the wealth of correlated physics. In this 
 talk\, I will present our<br>
\nrecent results about interactions betw
 een moiré excitons and charge carriers trapped in moiré<br>
\npotent
 ials. We have discovered a new interaction between exciton and charges
  enabled by<br>
\nunusual quantum confinement in 2D moiré superlattic
 es\, which results in novel exciton many-<br>
\nbody ground states com
 posed of moiré excitons and correlated electron lattices. The phase<b
 r>
\ndiagram is further enriched when we investigate the magnetic inte
 ractions with optical<br>
\nexcitation. We have observed that the spin
 -spin interactions between moiré trapped holes can be<br>
\ndrastical
 ly tuned by optical excitation power\, pointing to the excitons mediat
 ed long-range<br>
\nexchange interaction between moiré trapped carrie
 rs. This discovery adds a new and dynamic<br>
\ntuning knob to the ric
 h many-body Hamiltonian of moiré quantum matter. Our work provides th
 e<br>
\nframework for understanding and engineering electronic and exc
 itonic states in moiré quantum<br>
\nmatters.
URL:https://www.physics.wisc.edu/events/?id=8161
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