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DTSTAMP:20260412T121350
DTSTART:20170410T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/733632-numerical-stud
 ies-of-the-phase-diagram-of-the-shastry-sutherland-material-srcu2bo32-and-
 a-free-radical-magnet-n-adrian-feiguin-northeastern
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Numerical studies of the phase diagram of the Shastry-Sutherland ma
 terial SrCu2(BO3)2 and a free radical magnet – Adrian Feiguin\, Northeas
 tern
DESCRIPTION:Professor Adrian Feiguin\, Department of Physics\, Northeaster
 n University Boston\, MA\, 02115\, USA
\nMagnetism is intrinsically a quan
 tum phenomenon dictated by the collective behavior of individual atomic mo
 ments. This “quantumness” is enhanced for half-integer spins S = 1/2
  and could give rise to exotic quantum phases of matter without a classica
 l analog. Quantum magnets present an exciting playground to realize Bose-E
 instein condensation and 'quantum crystals''\, for instance. I will report
  on the magnetic phase diagram of two interesting examples: the dimerized 
 quantum magnet SrCu2(BO3)2\, and the free radical magnet NIT-2Py. In both 
 cases we conduct large-scale numerical simulations using the Density Matri
 x Renormalization Group method (DMRG) to shed light on the nature and stru
 cture of the different magnetic phases. The first example (SrCu2(BO3)2) ca
 n be described as a realization of the paradigmatic Shastry-Sutherland mod
 el\, and we find the emergence of fractionally filled bosonic crystals in 
 mesoscopic patterns\, specified by a sequence of magnetization plateaus.
\
 nIn the second case\, first principles calculations show that NIT-2Py can 
 be described as a quasi-two-dimensional arrangement of tetramers. Their sp
 atial arrangement and the structure of the interactions yield a rich phase
  diagram with the presence of a half-magnetization plateau\, and two unusu
 al Bose-Einstein condensates where only half of the spins contribute to th
 e superfluid density.
\n 
\nSite web du groupe du Pr Feiguin
\nCette conf
 érence est présentée par le RQMP Versant Nord du Département de physi
 que de l'Université de Montréal et le Département de génie physique
  de Polytechnique Montréal.
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