BEGIN:VCALENDAR VERSION:2.0 PRODID:-//FeRMI - ECPv6.15.20//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:FeRMI X-ORIGINAL-URL:https://fermi.univ-tlse3.fr X-WR-CALDESC:Évènements pour FeRMI REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:Europe/Paris BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20210328T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20211031T010000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20220327T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20221030T010000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20230326T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20231029T010000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20220405T140000 DTEND;TZID=Europe/Paris:20220405T153000 DTSTAMP:20260424T215007 CREATED:20220404T060030Z LAST-MODIFIED:20220404T072528Z UID:8018-1649167200-1649172600@fermi.univ-tlse3.fr SUMMARY:Riemann surfaces for the totally asymmetric simple exclusion process with open boundaries (Ulysse Godreau/ LPT / Seminar). - 05/04\, 14 H. DESCRIPTION:Ulysse Godreau (LPT) \nAbstract : \nThe totally asymmetric exclusion process (TASEP) is a continuous time Markov process much studied in statistical physics featuring particles with hard-core interaction hopping randomly on a one dimensional lattice. \nThis talk will focus on the study of the fluctuations of the particle current in the TASEP with open boundaries in the thermodynamic limit. More precisely\, the eigenvalues of a deformation of the Markov matrix of the process\, connected to the cumulant generating function of the current\, are computed in two different ways. The first excited states are recovered from the ground state eigenvalue (obtained by matrix product ansatz) by analytic continuation. They are then compared with the asymptotics of the Bethe ansatz equations. The eigenstates are put in correspondence with the sheets of a Riemann surfaces\, which is the maximal domain of definition of the analytic continuation of the ground states. Connections are made with KPZ universality and previous results on the TASEP with periodic boundary conditions. \n  URL:https://fermi.univ-tlse3.fr/event/riemann-surfaces-for-the-totally-asymmetric-simple-exclusion-process-with-open-boundaries-ulysse-godreau-lpt-seminar-05-04-14-h/ LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France CATEGORIES:Events,LPT,Seminars END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20220412T140000 DTEND;TZID=Europe/Paris:20220412T160000 DTSTAMP:20260424T215007 CREATED:20220411T050055Z LAST-MODIFIED:20220411T064719Z UID:7985-1649772000-1649779200@fermi.univ-tlse3.fr SUMMARY:How to make your code run faster using GPUs (Alejandro Estana / LPT / Seminar). - 12/04\, 14 H. DESCRIPTION:Alejandro Estana (LPT) \nAbstract : \nIf the sequential execution of our code is not fast enough for our purpose\, we can start thinking about parallelizing it. Parallelize a code means that some parts of the code will be run in parallel and therefore the total computing time will be reduced. Because of its parallel processing architecture\, the Graphics Processing Units (GPU) has become an essential component when we think about parallelising a code. New clusters contains GPUs in their computing nodes and if we want to take advantage of their computational power we need to adapt our code one way or another. \nIn the first part of the talk\, I will introduce the GPU architecture and GPU programming explaining the different approaches that we can take to use the GPUs power. \nIn the second part of the talk\, I will present three practical examples of GPU parallelization that I have implemented in collaboration with researchers of the LPT and IRAP (Institut de recherche en astrophysique et planétologie). \n\n  URL:https://fermi.univ-tlse3.fr/event/how-to-make-your-code-run-faster-using-gpus-alejandro-estana-lpt-seminar-12-04-14-h/ LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France CATEGORIES:Events,LPT,Seminars END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20220414T140000 DTEND;TZID=Europe/Paris:20220414T160000 DTSTAMP:20260424T215007 CREATED:20220411T040025Z LAST-MODIFIED:20220411T064737Z UID:7983-1649944800-1649952000@fermi.univ-tlse3.fr SUMMARY:Building Machine Learning assisted Phase Diagrams: three chemically relevant examples. - (Xabier Telleria Allika / LCPQ / Seminar). - 14/04/2022 DESCRIPTION:Xabier Telleria Allika (hosted by Arjan and Stefano) \nAbstract: \nIn this work we present a systematic procedure to build phase diagrams for chemically relevant properties by the use of a semi-supervised machine learning technique called uncertainty sampling. Concretely\, in this work we focus on ground state spin multiplicity and chemical bonding properties. As a first step\, we have obtained single-eutectic-point-\ncontaining solid-liquid systems which have been suitable for contrasting the validity of this approach. Once this was settled\, on the one hand\, we have built magnetic phase diagrams for several Hooke atoms containing few electrons (4 and 6) trapped in spheroidal harmonic potentials. Changing the parameters of the confinement potential such as curvature and anisotropy and interelectronic interaction strength\, we have been able to obtain and rationalise magnetic phase transitions flipping the ground state spin multiplicity from singlet (non magnetic) to triplet (magnetic) states. On the other hand\, Bader’s analysis is performed upon helium dimers confined by spherical harmonic potentials. Covalency is studied using descriptors as sign for ∆ρ(rC) and H(rC) and the dependency on the degrees of freedom of the system is studied i.e. potential curvature ω2 and inter atomic distance R. As a result\, we have observed that there may exist a covalent bond between He atoms for short enough distances and strong enough confinement. This machine learning procedure could\, in principle\, be applied to the study of other chemically relevant properties involving phase diagrams\, saving a lot of computational resources URL:https://fermi.univ-tlse3.fr/event/building-machine-learning-assisted-phase-diagrams-three-chemically-relevant-examples-xabier-telleria-allika-lcpq-seminar-14-04-2022/ LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France CATEGORIES:Events,LCPQ,Seminars END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20220414T140000 DTEND;TZID=Europe/Paris:20220414T160000 DTSTAMP:20260424T215007 CREATED:20220411T043044Z LAST-MODIFIED:20220411T064752Z UID:8031-1649944800-1649952000@fermi.univ-tlse3.fr SUMMARY:Reconfigurable self-assembly: evolutive DNA nanomachines\, coffee-ring diagnostics and living crystals (Damien Baigl / LPCNO / Seminar). - 14/04\, 14H DESCRIPTION:Damien Baigl (ENS Paris) \nAbstract : \nSelf-assembly is a both a formidable method to organize molecular or colloidal entities into functional superstructures and a playground for the scientific endeavor on how matter organizes itself. Self-assembly is also a key-feature of how life builds its components. However\, compared to their living counterparts\, synthetic materials made by self-assembly usually lack some of the characteristic properties of living systems such as reconfigurability\, adaptability or evolution. In this presentation\, I will describe different systems where such properties can emerge from self-assembled synthetic materials. First\, I will show that elaborate user-defined DNA nanostructures (e.g.\, DNA origamis\, tiles\, extended nanogrids) can be obtained by spontaneous self-assembly at room temperature for the first time with a unique capability to adapt to their environment by changing their shape\, transforming and evolving [1\,2]. Then\, I will present a new DNA self-assembly principle that does not rely on base-pairing principles. I will show in particular that photosensitive DNA intercalating molecules can co-assemble with DNA bases to form new extended supramolecular materials of unprecedented properties. I will describe in particular the formation of photoswitchable 3D crystals with unique photoreversible growth and light-gated fluorescence [3]. Finally\, I will present different colloidal self-assembly processes at air-water or liquid-liquid interfaces and explore how dynamic properties can emerge from such systems. Starting from the familiar situation of drying drop containing a colloidal suspensions\, we have been interested in controlling/cancelling the so-called “coffee-ring effect” [4-7] or turning it into a low-cost yet powerful medical diagnostic tool [8]. In such systems\, however\, particles adsorb at the interface to form amorphous structures. This led us to invent a simple method in which bulk particles adsorb at the water-interface and directly crystallize there. Based on the use of ultralow amounts of surfactant\, 2D colloidal crystals spontaneously form without any other applied force than their own weight [9]. This method allows us to crystallize a broad variety of nanometric and micrometric particles\, including those made of polymers\, metals or inorganic materials\, and tune the characteristics of the colloidal crystals [10]. These colloidal crystals display intense structural colors as well as\, under some conditions\, some remarkable dynamic properties at the air/water interface. For instance\, using light\, we can reversibly melt/crystallize these colloidal assemblies on command\, evidencing interesting life-like properties\, such as dissipative or living crystallization [11\,12]. \nReferences:[1] Rossi-Gendron et al.\, ChemRxiv 2022 (preprint)\, doi :  10.26434/chemrxiv-2022-12jqs[2] Nakazawa et al.\, Angew. Chem. Int. Ed. 2021\, 60\, 15214 –15219[3] Zhou et al.\, J. Am. Chem. Soc. 2019\, 141\, 9321–9329[4] Anyfantakis et al.\, Angew. Chem. Int. Ed. 2014\, 53\, 14077–14081[5] Varanakkottu et al.\, Nano Lett. 2016\, 16\, 644–650[6] Poulichet et al.\, J. Colloid. Interf. Sci. 2020\, 573\, 370-375[7] Galy et al.\, ACS Appl. Mater. Interfaces 2022\, 14\, 3374–3384[8] Devineau et al.\, J. Am. Chem. Soc. 2016\, 138\, 11623–11632[9] Anyfantakis\, Langmuir 2018\, 34\, 15526−15536[10] Vialetto et al.\, Nanoscale 2020\, 12\, 6279-6284[11] Vialetto et al. Angew. Chem. Int. Ed. 2019\, 58\, 9145-9149[12] Vialetto et al.\, J. Am. Chem. Soc. 2021\, 143\, 11535−11543 URL:https://fermi.univ-tlse3.fr/event/reconfigurable-self-assembly-evolutive-dna-nanomachines-coffee-ring-diagnostics-and-living-crystals-damien-baigl-lpco-seminar-14-04-14h/ LOCATION:Amphi Vinci\, bâtiment 20 du LPCNO\, INSA – LPCNO : 135 avenue de Rangueil\, Toulouse\, 31077\, France CATEGORIES:Events,LPCNO,Seminars END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20220419T080000 DTEND;TZID=Europe/Paris:20220419T170000 DTSTAMP:20260424T215007 CREATED:20220419T050002Z LAST-MODIFIED:20220419T070210Z UID:8048-1650355200-1650387600@fermi.univ-tlse3.fr SUMMARY:Microscopie électronique à transmission ultrarapide pour la nano-optique (Hugo Lourenço-Martins / CEMES / Seminar). - 21/04\, 11 H. DESCRIPTION:Séminaire du jeudi : \nHugo Lourenço-Martinschargé de recherche CNRS au CEMES\, Toulouse \nLa spectroscopie de perte d’énergie des électrons (EELS) dans un microscope électronique à transmission (TEM) est une technique puissante pour sonder les excitations optiques et électroniques avec une résolution spatiale sub-nanométrique. Cependant\, pour sonder les pertes spontanées\, cette technique : (1) reste intrinsèquement incapable de détecter les propriétés liées à la phase (par exemple\, le dichroïsme)\, (2) ne fournit pas un accès dans le domaine temporel aux processus ultrarapides et (3) est limitée dans sa résolution spectrale\, même pour les sources d’électrons les plus avancées disponibles (10-100 meV). \nLes développements récents dans le domaine de la microscopie électronique à transmission ultrarapide (UTEM) promettent de surmonter ces limitations en sondant les modes optiques excités par laser avec des impulsions électroniques femtosecondes. Plus précisément\, dans un schéma stroboscopique de pompe laser/sonde électronique\, un échantillon optiquement excité est mesuré avec des paquets d’ondes électroniques ultrabrèves photo-émises et le balayage de leur délai relatif donne accès à la dynamique ultrarapide impliquée. \nUn tel instrument combine donc la résolution spatiale d’un TEM conventionnel (nm) avec les résolutions spectrale et temporelle inégalées fournies par les lasers ultrarapides (respectivement sub-meV et centaines de femtosecondes)\, et offre donc des capacités uniques pour sonder les champs optiques à l’échelle nanométrique. \nDans ce séminaire\, je démontrerai comment cette technique – appelée microscopie électronique à champ proche induite par photons (PINEM) – peut être utilisée pour analyser la réponse optique de micro- et nano-résonateurs individuels directement à l’échelle nanométrique et avec une résolution de l’ordre de la femtoseconde. Je montrerai d’abord que la combinaison de techniques de mise en forme de phase appliquées au laser ou au faisceau d’électrons permet d’extraire des quantités liées à la phase dans les expériences PINEM. \nEnsuite\, je présenterai notre analyse de données basée sur la méthode des éléments de frontière (BEM) qui nous permet d’extraire des cartes de champ proche optique\, la magnitude et la phase relative de chaque mode d’un résonateur plasmonique excité par le laser de pompe femtoseconde\, comme illustré sur la figure. \nEnfin\, je démontrerai théoriquement et expérimentalement que le champ proche optique plasmonique peut être manipulé de manière cohérente en pompant le système avec deux impulsions optiques verrouillées en phase de longueur d’onde différente\, ce qui permet de créer un modèle de battement complexe entre deux modes plasmoniques différents dans le même nanorésonateur. \nLien Zoom :\nhttps://cnrs.zoom.us/j/94504560688?pwd=b0g1QUo1eldvUTQ2djMza1ZwQ2orUT09 \n  \n  URL:https://fermi.univ-tlse3.fr/event/microscopie-electronique-a-transmission-ultrarapide-pour-la-nano-optique-hugo-lourenco-martins-cemes-seminar-21-04-11-h/ CATEGORIES:CEMES,Events,Seminars END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20220419T140000 DTEND;TZID=Europe/Paris:20220419T153000 DTSTAMP:20260424T215007 CREATED:20220419T060058Z LAST-MODIFIED:20220419T065333Z UID:8021-1650376800-1650382200@fermi.univ-tlse3.fr SUMMARY:Dynamical Griffiths singularities (José A. Hoyos / LPT / Seminar). - 19/04\, 14 H. DESCRIPTION:José A. Hoyos (Université de São Paulo\, Brésil) \nAbstract : \nWe investigate the effects of impurities on the unitary evolution of an interacting quantum system after a quench. For a large variety of quench protocols\, the impurities become locally highly excited while the bulk practically remains in its ground state. As a consequence\, the system’s early-times dynamics is dominated by the impurities and new dynamical quantum phase transitions appear. Finally\, we interpret our results as a dynamical analog of the Griffiths singularities in equilibrium thermodynamics. \n\n  URL:https://fermi.univ-tlse3.fr/event/dynamical-griffiths-singularities-jose-a-hoyos-lpt-seminar-19-04-14-h/ LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France CATEGORIES:Events,LPT,Seminars END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20220422T110000 DTEND;TZID=Europe/Paris:20220422T110000 DTSTAMP:20260424T215007 CREATED:20220419T030019Z LAST-MODIFIED:20220419T070142Z UID:8046-1650625200-1650625200@fermi.univ-tlse3.fr SUMMARY:Optimal control of quantum systems with applications in Quantum Technologies (Dominique Sugny / LCAR / seminar). - 22/04\, 11H DESCRIPTION:Dominique Sugny \nLaboratoire Interdisciplinaire Carnot de Bourgogne\, Université de Bourgogne 9 Av. A. Savaray 21000 Dijon \n  \n\n  URL:https://fermi.univ-tlse3.fr/event/optimal-control-of-quantum-systems-with-applications-in-quantum-technologies-dominique-sugny-lcar-seminar-22-04-11h/ LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France CATEGORIES:Events,LCAR,Seminars END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20220429T113000 DTEND;TZID=Europe/Paris:20220429T130000 DTSTAMP:20260424T215007 CREATED:20220419T020056Z LAST-MODIFIED:20220419T080651Z UID:8050-1651231800-1651237200@fermi.univ-tlse3.fr SUMMARY:États quantiques électroniques et modes collectifs (Marie-Aude MEASSON / Institut Néel / SFP). - 29/04\, 11h30 DESCRIPTION:Marie-Aude MEASSON (Institut Néel\, Grenoble) \nVoir le résumé de la conférence sur le site de la section locale de la SFP ici. \n  URL:https://fermi.univ-tlse3.fr/event/etats-quantiques-electroniques-et-modes-collectifs-marie-aude-measson-institut-neel-sfp-29-04-11h30/ LOCATION:Amphi CONCORDE\, Bâtiment U4\, Amphithéâtre Concorde - Université Paul Sabatier\, Toulouse\, 31400\, France CATEGORIES:Events,Seminars,SFP / SFC ATTACH;FMTTYPE=image/png:https://fermi.univ-tlse3.fr/wp-content/uploads/2022/04/higgs_final_border_larger_SFP-e1650355646649.png END:VEVENT END:VCALENDAR