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SUMMARY:On frustrated 2d Heisenberg magnets   and  On the geometric theory
  of the dynamics of quasi-periodically driven quantum systems
DTSTART:20260506T090000Z
DTEND:20260506T100000Z
DTSTAMP:20260514T030400Z
UID:indico-event-18855@indico.psi.ch
CONTACT:markus.mueller@psi.ch
DESCRIPTION:Speakers: Chengzhi Le (EPFL)\n\nQuantum spin models on 2D frus
 trated lattices can exhibit various phases emerging from zero-point fluctu
 ations. Important examples include Néel order\, spin liquids\, and valenc
 e-bond states. In the first part of the talk\, I will briefly present our 
 ongoing study at EPFL of phase transitions in the J_1-J_2 spin-1/2 Heisen
 berg model on the honeycomb lattice\, based on the CTMRG method.\nIn the s
 econd part\, the focus shifts from ground states of many-body systems to t
 he dynamics of few-body systems. For periodically driven quantum systems\,
  Floquet theory shows that the evolution can be decomposed into a periodic
  micromotion and a secular macromotion. A recent study at MPIPKS further s
 howed that Floquet theory can be interpreted geometrically in terms of par
 allel transport and quantum geometry. I will briefly introduce this geome
 tric Floquet theory in the second part of the talk. Then\, I will present
  in detail our current results on its generalization\, the geometric theo
 ry on the dynamics of quasi-periodically driven quantum systems\, together
  with the underlying physics.”\n\nhttps://indico.psi.ch/event/18855/
LOCATION:WHGA/121
URL:https://indico.psi.ch/event/18855/
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