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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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UID:UW-Physics-Event-9894
DTSTART:20261124T160000Z
DTEND:20261124T170000Z
DTSTAMP:20261024T183749Z
LAST-MODIFIED:20261023T151343Z
LOCATION:3290 Chamberlin
SUMMARY:Quantum dynamics of repeated Gutzwiller projection\, Condensed
  Matter Theory Group Seminar\, Wen-Han Kao\, UW-Madison
DESCRIPTION:Local occupancy constraints in strongly correlated systems
  are usually enforced by interactions. We instead investigate a Floque
 t circuit of spinful fermions in which the same constraint is enforced
  by Gutzwiller projection onto single occupancy after each period of b
 rickwork hopping. The resulting nonunitary dynamics couples singlet fi
 ltering to spin exchange\, selecting a Dicke state as the unique nonde
 caying state in each conserved magnetization sector. An exact one-magn
 on solution reveals mode-dependent exceptional points separating purel
 y relaxational modes from damped oscillatory pairs with a common decay
  rate. Global SU(2) symmetry extends these exact modes across magnetiz
 ation sectors\, and analytical arguments near both unitary limits iden
 tify the slowest nonstationary modes within the descendant multiplets.
  Many-body simulations reveal a crossover from diffusive relaxation to
  damped recurrences near the SWAP limit\, characterized by Dicke-state
  fidelity\, spin correlations\, and entanglement entropy. Our results 
 establish measurement-enforced occupancy constraints as a route to str
 ongly correlated nonunitary dynamics\, revealing the interplay of sing
 let filtering\, diffusive relaxation\, and SWAP-driven recurrences.
URL:https://www.physics.wisc.edu/events/?id=9894
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