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• 04 March
  [Institut Quantique] IQ / RQMP
  04 March

  [Institut Quantique] IQ / RQMP

  Location : Description : Speaker: Thursday, March 4th 2021,10:30Angel RubioUniversidad del País VascoJoin ZoomMeetinghttps://umontreal.zoom.us/j/98762992846?pwd=dFY1ZktDaXQvMzlFNGZRL3cxUngwQT09 Meeting ID:987 6299 2846Passcode:229839 Angel Rubio– MaxPlanck, Flatiron Institute, EHUJeudi le4 Mars / Thursday, March 410h30 –11h30Zoom lien / link: https://umontreal.zoom.us/j/98762992846?pwd=dFY1ZktDaXQvMzlFNGZRL3cxUngwQT09Meeting ID: 987 6299 2846Passcode: 229839****************************************************Description:Angel RubioMax Planck Institute for the Structure and Dynamics ofMatter, Luruper Chaussee 149, 22761 Hamburg, Germany; Center for Computational Quantum Physics FlatironInstitute, Simons Foundation, 10010 NY, USANano-Bio Spectroscopy group and ETSF, Universidad delPaís Vasco UPV/EHU, San Sebastián , SpainCavity QED quantum materials engineering Résumé / Abstract: We provide an overview ofhow well-established concepts in the fields of quantum chemistry and materialshave to be adapted when the quantum nature of light becomes important. We willpursue the question of whether it is possible to create these new states ofmaterials as groundstates of the system. To this end, we will show how theemerging (vacuum) dressed states resemble Floquet states in driven systems. Aparticular appeal of light dressing is the possibility to engineer symmetrybreaking which can lead to novel properties of materials. Strong light–mattercoupling in cavities provides a pathway to break fundamental materialssymmetries, like time-reversal symmetry in chiral cavities. We will discuss thepotential to realize non-equilibrium states of matter that have so far beenonly accessible in ultrafast and ultrastrong laser-driven materials. Weillustrate the realisation of those ideas in molecular complexes and 2Dmaterials and show that the combination of cavity-QED and 2D twisted van der Waalsheterostructures provides a novel and unique platform for the seamlessrealisation of a plethora of interacting quantum phenomena, including exoticand elusive correlated and topological phases of matter. We will brieflyintroduce our newly developed quantum electrodynamics density-functionalformalism (QEDFT) as a first-principles framework to predict, characterize andcontrol the spontaneous appearance of ordered phases of strongly interactinglight-matter hybrids.Bio: Angel Rubio is theDirector of the Theory Department of the Max Planck Institute for the Structureand Dynamics of Matter and Distinguish Research Scientist at the SimonsFoundation’s Flatiron Institute (NY, USA). He is also Professor/Chair for condensedmatter physics at the University of the Basque Country in San Sebastián, Spain.He received his PhD in Physics in 1991 from the University of Valladolid (UVA).He worked as post-doctoral researcher at University of California at Berkeley(1992-94). Between 1994 and 2001 he was an Associate Professor at the UVA.Diverse Professorships at the École Polytechnique Paris-Saclay, the FreieUniversität Berlin and the Université de Montpellier followed. After beingappointed with a Full Professorship in 2001, he moved to San Sebastián andstarted at the University of the Basque Country (UPV/EHU) as Chair of CondensedMatter Physics and director of the Nano-Bio Spectroscopy Group. In August 2014he accepted the position as Director of the Max Planck Institute for theStructure and Dynamics of Matter in Hamburg, Germany. He is one of the foundersof the European Theoretical Spectroscopy Facility (ETSF) and the originator ofthe widely used ab initio open-source project Octopus. Rubio is a Fellow of theAmerican Physical Society and the American Association for the Advancement ofScience, member of the Academia Europaea, European Academy of Sciences and aforeign associate member of the National Academy of Sciences. His work has beenrecognized by several awards, including the 2018 Max Born medal and prize, 2016Medal of the Spanish Royal Physical Society, the 2014 Premio Rey Jaime I forbasic research, the 2006 DuPont Prize in nanotechnology, the 2005 FriedrichWilhelm Bessel Research Award of the Humboldt Foundation, and two EuropeanResearch Council advanced grants (2011 and 2016).His research interests arerooted in the modeling and theory of electronic and structural properties ofcondensed matter as well as in the development of new theoretical tools toinvestigate the electronic response of materials, 2D materials, nanostructures,and hybrid materials to external electromagnetic fields. He is acknowledged asa pioneer and leader in the area of computational materials physics and one ofthe founders of modern “theoretical spectroscopy” in the last years he haspioneered the development of the theoretical framework of “quantumelectrodynamical density functional theory (QEDFT)” that enables the ab-initiomodeling of strong light-matter interaction phenomena in materials,nanostructures, and molecules. (opening the new fields of QED-Chemistry orpolaritonic chemistry). 

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• 08 March
  [Institut Quantique] MatQ:
  08 March

  [Institut Quantique] MatQ:

  Location : Description : https://umontreal.zoom.us/j/93026432919?pwd=SkVyQ2w2Z3Q2SW5CcjJQa2QwVlRsZz09 Meeting ID: 930 2643 2919Password: 137 Affiliation:Département de génie mécanique,École de technologie supérieure jacques.lengaigne.1@ens.etsmtl.ca Jacques LengaigneTitre: Masques et filtration, lesmembranes qui font le travail Masks and filtration, themembranes that do the trick  Résumé: Le masque, toujours dans notreface, littéralement... Comment cette technologie d’apparence si anodines’est-elle imposée dans notre vie de tous les jours? Dans cette courteconversation, je vais tenter de vous présenter la vie intime du masque: desmécanismes de filtration aux défis de la fabrication auxquels nous faisons facepour approvisionner le monde. Sans conspiration, presque pas de politique,surtout de l’ingénierie, une pincée de science, venez pour une trempette dansla mare des textiles de commodités.  Abstract: The ubiquitous mask, always inour face, literally... How does this seemingly simple piece of technology hassecured a place in our everyday life? In this short talk, I will present theinner life of the mask: from the simple working principles of filtration to themanufacturing hurdles we face to supply the world. No conspiracy, minimalpolitics, mostly engineering, a touch of science, come for a dive in the worldof commodity textiles.  Sidhartha Dash Title: "Oxygen hole doping and superconductivity in the three-band Hubbard model"Abstract:  The one-band Hubbard model describes quite well various aspects of the cuprate superconductors. However, it does not take into account the oxygen orbitals explicitly and hence cannot explain the experimental observations related to oxygen hole doping. For instance, Rybicki et al. [1] have shown that the superconducting critical temperature (T_c) is correlated with the hole content on the oxygen orbitals. In this talk, I will present our recent work on the three-band Hubbard model, which is a more accurate model for cuprates, using cluster dynamical mean field theory (CDMFT) at zero temperature with exact diagonalization (ED) impurity solver. We start with realistic values of band parameters from Weber et al. [2] and explore different parameter-sets. We observe that the superconducting order parameter at optimal doping is monotonously related to the corresponding oxygen hole doping and the charge-transfer gap, in the parameter regime relevant to cuprates. We also show indications that pairing in the three-band model is mediated by short-range antiferromagnetic interactions as is also known for the one-band Hubbard model.1.    Rybicki, Damian, et al. "Perspective on the phase diagram of cuprate high-temperature superconductors." Nature communications 7.1 (2016): 1-6.2.    Weber, Cédric, et al. "Scaling of the transition temperature of hole-doped cuprate superconductors with the charge-transfer energy." EPL (Europhysics Letters) 100.3 (2012): 37001.  

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• 10 March
  [Institut Quantique] InfoQ – Groupes Dupont-Ferrier/Hofheinz
  10 March

  [Institut Quantique] InfoQ – Groupes Dupont-Ferrier/Hofheinz

  Location : Description : Rejoindre la réunion Microsoft Teams / Join the Microsoft Teams meeting

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