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SUMMARY:Tunable nonlinear polaritons in moiré and strongly correlated mat
 erials
DTSTART:20260922T062000Z
DTEND:20260922T072000Z
DTSTAMP:20260925T101000Z
UID:indico-event-231@indico.phys.nthu.edu.tw
DESCRIPTION:Speakers: Kok Wee Song (Deaprtment of Physics\, Xiamen Univers
 ity Malaysia)\n\nTwo-dimensional semiconductors and magnetic van der Waals
  materials offer a uniquely tunable platform for engineering strong light-
 matter coupling\, where moiré superlattices and strong electronic correla
 tions combine to produce rich\, controllable optical nonlinearities. In th
 is talk\, I will present a microscopic theory of moiré exciton-polaritons
  in twisted transition metal dichalcogenide (TMD) bilayers\, showing how t
 he interplay of interlayer tunneling\, twist angle\, and applied electric 
 field enables electrically tunable and enhanced polariton nonlinearity\, i
 ncluding a crossover between attractive and repulsive interaction regimes.
  I will then discuss how nonlinear phase-space filling and Pauli blocking 
 govern polariton saturation in lattice and doped systems\, connecting this
  framework to a recent charge-tunable experiment on a gate-controllable Mo
 Te₂-MoSe₂ heterobilayer cavity. Extending beyond excitons\, I will sho
 w how Coulomb scattering between trions gives rise to an unusually strong 
 attractive polariton nonlinearity\, offering a distinct route to interacti
 ng photonic fluids. Finally\, I will turn to strongly correlated van der W
 aals magnets\, presenting a microscopic superexchange theory for chromium 
 trihalides and recent results on exciton-polariton condensation in the mag
 netic semiconductor CrSBr\, highlighting the emerging opportunities at the
  intersection of magnetism\, strong correlations\, and cavity photonics.\n
 \nhttps://indico.phys.nthu.edu.tw/event/231/
LOCATION:Physics/019 (NTHU)
URL:https://indico.phys.nthu.edu.tw/event/231/
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