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DTSTAMP:20260414T210036
DTSTART:20150223T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/566541
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Antiferromagnetic topological insulators – Roger Müller\, UdeM
DESCRIPTION:Roger Müller\, Département de physique\, Université de Montr
 eal\, Montréal\, QC\, CanadaIn my talk I will revisit the different steps
  that led to the discovery of the first topological insulator (TI). We wil
 l see the most important concepts in describing this new state of matter\,
  and what its fascinating consequences are. To motivate the subject we wil
 l review the quantum Hall effect and the first realization of a two-dimens
 ional topological insulator in a HgTe/CdTe quantum well\, before we genera
 lize these results to 3 dimensions. We will see how one can incorporate pr
 inciples of topology to characterize a specific system with the use of top
 ological invariants. In the second part of the talk we go one step further
  and ask the question if topological order can coexist with a broken symme
 try state - moreover\, if it is possible that a local order parameter whic
 h breaks one or more symmetries can give rise to topological order. In thi
 s context  we turn to a first derivative of the TI state\, the antiferrom
 agnetic topological insulator (AFTI). After theoretically motivating the s
 ubject we take a look at two half-Heusler compounds\, materials that where
  suggested on the base of their structure\, as prime candidates for this n
 ew state of matter. We will investigate if they fulfill the needed prerequ
 isites for an AFTI [1]. R. A. Müller et al.\, Phys. Rev. B 90\, 041109 (
 2014).Voici le lien vers la page web du groupe de recherche du M MüllerC
 ette conférence est présentée par le RQMP Versant Nord du Département
  de physique de l'Université de Montréal et le Département de génie ph
 ysique de Polytechnique Montréal.
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