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SUMMARY:Toward Bosonic Topological Quantum Phases in Moiré Superlattices
DTSTART:20260407T203000Z
DTEND:20260407T213000Z
DTSTAMP:20260425T135000Z
UID:indico-event-282@eventreg.ads.ttu.edu
DESCRIPTION:Speakers: Ming Xie (UT Dallas)\n\nMoiré superlattices formed 
 by stacking and slightly twisting atomically thin materials have recently 
 emerged as a powerful platform for exploring quantum matter. Their excepti
 onal tunability allows researchers to engineer flat energy bands and stron
 g interactions\, leading to a wide range of correlated and topological ele
 ctronic phases. So far\, most of these discoveries have focused on electro
 ns. In this talk\, I will discuss how similar ideas can be extended to bos
 onic particles\, such as excitons (bound electron–hole pairs) and magnon
 s (quantized spin waves)\, opening new directions for realizing topologica
 l quantum phases.In the first part\, I will present our recent theoretical
  proposal showing that engineering the layer degrees of freedom of exciton
 s in a semiconductor heterostructure can produce nearly flat exciton bands
  with nontrivial topology. These “topological exciton bands” provide a
  bosonic analogue of well-known electronic topological models and offer a 
 promising route toward interaction-driven phases such as bosonic fractiona
 l Chern insulators. In the second part\, I will show that magnetic states 
 in twisted semiconductor bilayers can host topological magnons. In these s
 ystems\, the stability of magnetism is directly tied to the topology of th
 e underlying state\, and the magnon properties can be tuned using an exter
 nal electric field. Together\, these results highlight moiré materials as
  a versatile platform for designing and exploring new forms of topological
  quantum matter beyond electrons.\n\nhttps://eventreg.ads.ttu.edu/event/28
 2/
LOCATION:120 (ESB 1)
URL:https://eventreg.ads.ttu.edu/event/282/
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