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DTSTART;TZID=Europe/Paris:20230613T140000
DTEND;TZID=Europe/Paris:20230613T153000
DTSTAMP:20260423T084129
CREATED:20230606T140038Z
LAST-MODIFIED:20230612T121721Z
UID:9013-1686664800-1686670200@fermi.univ-tlse3.fr
SUMMARY:Automatic differentiation in iPEPS simulations : unravelling the black box . - (Anna Francuz / LPT / Seminar). - 13/06/2023\, 14H
DESCRIPTION:Anna Francuz (Université de Vienne) \nSeminar LPT\, 13/06/2023\, 14H\, 3R1\, seminar room\, 3rd floor \nSummary : \nTensor networks have already proven to be extremely useful tools in the studies of strongly correlated quantum systems. Being immune to the sign problem\, they enable calculations beyond Quantum Monte Carlo and directly in the thermodynamic limit. The most established and understood tensor network method is density matrix renormalization group (DMRG)\, while all others\, including projected entangled pair states (PEPS) seemed to remain far behind until recently\, when an automatic differentiation framework was established. This toolbox\, originally developed for the deep learning purposes\, enables a simple calculation of exact derivatives in an optimization problem at hand and hence bridges the gap between DMRG and PEPS simulations. I will try to deliver a multi-level talk\, starting with a comprehensive introduction of tensor network methods with focus on iPEPS before delving into details of derivative calculation for optimization purposes. On the example of Corner Transfer Matrix (CTM) I will explain the idea of algorithmic differentiation\, present possible challenges and show ways to overcome them. \n  \n 
URL:https://fermi.univ-tlse3.fr/event/tba-anna-francuz-lpt-seminar-13-06-2023-14h/
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:20230615T110000
DTEND;TZID=Europe/Paris:20230615T123000
DTSTAMP:20260423T084129
CREATED:20230614T124741Z
LAST-MODIFIED:20230622T124952Z
UID:9141-1686826800-1686832200@fermi.univ-tlse3.fr
SUMMARY:Électrochimie à l’échelle nanométrique : comprendre le transport ionique / électronique dans les matériaux pour le stockage de l’énergie. - (Patrice Simon /  Seminar / CEMES). - 15/06/2023\, 11H
DESCRIPTION:Les séminaires du jeudi\n \n Patrice Simon  CIRIMAT\, Toulouse \nRésumé : \nLe stockage électrochimique de l’énergie (batteries\, supercondensateur)\, porté principalement par le développement de la mobilité électrique\, est devenu aujourd’hui un enjeu sociétal et économique majeur (diminution de la dépendance aux énergies fossiles et lutte contre l’émission de CO2). Les réactions dans les électrodes de systèmes de stockage électrochimique de l’énergie mettent en jeu des transferts ioniques et électronique à l’interface solide / électrolyte dans des électrodes poreuses. Les performances de ces électrodes dépendent des cinétiques de transport et de transfert des espèces dans les matériaux dits actifs électrochimiquement. \nDans cet exposé\, nous montrerons comment il est possible de mesurer les flux ioniques et électroniques dans ces électrodes grâce à des techniques électrochimiques avancées. Nous verrons que le confinement de l’électrolyte dans des canaux nanométrique et sub-nanométrique conduit à la modification de leur solvatation\, entraînant des propriétés remarquables pour le stockage électrochimique de l’énergie.
URL:https://fermi.univ-tlse3.fr/event/electrochimie-a-lechelle-nanometrique-comprendre-le-transport-ionique-electronique-dans-les-materiaux-pour-le-stockage-de-lenergie-patrice-simon-seminar-cemes-15-06/
LOCATION:salle de conférence du CEMES\, CEMES - 29\, rue Jeanne Marvig BP 94347\, Toulouse\, 31055\, France
CATEGORIES:CEMES,Events,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20230629T090000
DTEND;TZID=Europe/Paris:20230629T103000
DTSTAMP:20260423T084129
CREATED:20230629T064318Z
LAST-MODIFIED:20230629T064318Z
UID:9148-1688029200-1688034600@fermi.univ-tlse3.fr
SUMMARY:Optimal control of quantum systems: Applications to the robust control of Bose-Einstein Condensates and to quantum speed limit with piecewise constant control. - (Etienne Dionis / LCAR / Seminar). - 29/06/2023\, 9H
DESCRIPTION:Etienne Dionis (Laboratoire Interdisciplinaire Carnot de Bourgogne\, Université de Bourgogne-Franche Comté) \nSéminaire LCAR Jeudi 29 juin\, 9H00. – Nouvelle Salle de conférence\, 3R4 \nRésumé :\nThis presentation will focus on two recent applications of optimal control techniques to quantum\nsystems. \nIn the first part\, the goal is to manipulate the motional states of an atomic Bose-Einstein\ncondensate (BEC) in a one-dimensional optical lattice. This study is a joint work wit the experi-\nmental group of Pr. D. Guéry-Odelin in Toulouse University (France). The protocols operate on\nthe momentum comb associated with the lattice through its amplitude and phase [3]. A precise and\nversatile control for a wide variety of targets has been demonstrated. However\, in order to improve\nthe agreement between theory and experiment\, it is important to design control processes that are\nrobust with respect to experimental uncertainties (Figure 1). One limitation of the experimental\nsetup under study is the value of the quasi-momentum which is not exactly zero as assumed in\n[3]. Due to the large dimension of the Hilbert space\, numerical algorithms such as GRAPE [1]\nhave to be used. In the case of the simultaneous control of an ensemble of systems\, we propose\na new formulation of GRAPE with a sequential-update of the control. We show numerically the\nsuperiority of this sequential approach with respect to the standard one [2].\nIn the second part\, we apply a recent extension of the Pontryagin Maximum Principle (PMP) [4]\nto piecewise constant control. PMP\, on which optimal control theory is based\, was originally for-\nmulated for continuous functions. In practice\, experimental implementations resort to piecewise\nconstant signals. In [5]\, the authors have mathematically proved that for general non-linear dy-\nnamics\, the PMP should be modified in a non-trivial way. We have transposed this result to\nquantum systems and applied it to the time-optimal control of simple quantum systems with two\nlevels (Figure 2). In these systems\, we derive exact quantum speed limits accounting for this key\nexperimental constraint [6]. This should be an important step toward understanding the role of\ntechnological limitations in the manipulation of quantum systems\, a key issue in quantum control. \nReferences\n[1] Glaser S. J.\, Boscain U.\, Calarco T.\, Koch C.\, Kockenberger W.\, Kosloff R.\, Kuprov I.\, Luy\nB.\, Schirmer S.\, Schulte-Herbrüggen T.\, Sugny D. and Wilhelm F. 2015 Eur. Phys. J. D 69\,\n279\n[2] Dionis E. and Sugny D. 2022 J. Phys. B: At. Mol. Opt. Phys. 55\, 184006\n[3] Dupont N.\, Chatelain G.\, Gabardos L.\, Arnal M.\, Billy J.\, Peaudecerf B.\, Sugny D. and\nGuéry-Odelin D. 2021 PRX Quantum 2\, 040303\n[4] Boscain U.\, Sigalotti M. and Sugny D. 2021 PRX Quantum 2\, 030203\n[5] Bourdin L. and Trélat E. 2017 Automatica 79\, 273\n[6] Dionis E. and Sugny D. 2023 Physical Review A 107\, 032613
URL:https://fermi.univ-tlse3.fr/event/optimal-control-of-quantum-systems-applications-to-the-robust-control-of-bose-einstein-condensates-and-to-quantum-speed-limit-with-piecewise-constant-control-etienne-dionis-lcar-seminar-2/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LCAR,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20230629T140000
DTEND;TZID=Europe/Paris:20230629T160000
DTSTAMP:20260423T084129
CREATED:20230620T083831Z
LAST-MODIFIED:20230621T133442Z
UID:9019-1688047200-1688054400@fermi.univ-tlse3.fr
SUMMARY:Well-defined organometallic precursors for developing tailored catalytic materials. - (Pascual Oña Burgos / LPCNO / Séminaire). – 29/06/2023\, 14H
DESCRIPTION:Pascual Oña Burgos (Instituto de Tecnología Química\, Valencia\, Spain) \nSéminaire LPCNO\, GP seminar room\, INSA\, Bât. 27\, Salle 2.20  \nSummary :\nSmall molecule activation\, such as H2O\, H2\, N2\, O2 or CO2\, constitutes a critical frontier of chemical science\, potentially removing the hazardous global warming gases and providing chemical precursors from Earth’s most abundant molecules. In this talk\, we shall explore how homo and heterometallic complexed can be used as building blocks to achieve different solid materials\, ranging from MOFs to supported metal nanoparticles\, showing enhanced efficiency in these processes.\nSpecifically\, Water splitting is one of the key processes for many energy storage and conversion applications\, being water oxidation or oxygen evolution reaction (OER) still considered the most challenging step. In this regard\, cobalt-based metal-organic frameworks (MOFs) have recently attracted great interest due to their notable electrocatalytic OER activity and the abundance of this metal on Earth.1\,2 Based on that idea\, we developed a new cobalt metal−organic framework (2D-Co-MOF) with well-defined layered double cores strongly connected by intermolecular bonds (Figure 1a). In situ electrochemically activated 2D-Co-MOF@Nafion exhibits an outstanding electrocatalytic performance for the OER at neutral pH and a high robustness. The particular coordination chemistry of the MOF consisting of a regular arrangement of multiple Co(II) redox metal sites connected by appropriate organic ligands explains the higher catalytic activity of this MOF.\nAnother challenge still to be met in water splitting is finding a multifunctional electrocatalyst. In that sense\, the benchmark HER electrocatalysts are Pt-based materials. However\, they are not suitable for OER. On the other hand\, Ir and Ru oxides are state-of-art OER electrocatalysts. Unfortunately\, they show insufficient activity toward HER.\nOn the lookout for these multifunctional systems\, we reported a supported Fe-doped Pd-nanoparticles (NPs) prepared via soft transformation of a PdFe-MOF.3 The thus synthesized bimetallic PdFe NPs are supported on FeOx@C layers\, essential for developing well-defined and distributed small NPs. The application of this material (PdFe@FeOx-C) as a multifunctional nanocatalyst for the electrocatalytic water splitting process has been investigated with promising results in terms of favourable intrinsic activity\, wide pH window and high stability (Figure 2b).4 More recently\, we developed a straightforward\, efficient\, and robust synthesis of mono- and bimetallic nanoparticles promoted through a commercially available metallic source\, the Wilkinson complex\, in order to prepare Rh2P nanoparticles\, which have high crystallinity and are coated with graphitic carbon patches.5 The resulting materials have been tested in electrocatalytic HER and OER processes at acid\, alkaline and neutral media\, providing superb HER activity and competitive OER performance\, particularly at neutral and alkaline media\, compared to the benchmark HER and OER electrocatalysts Pt and RuOx/IrOx\, respectively.6 \nReferences\n[1] Gutiérrez Tarriño\, S.; Olloqui-Sariego\, J. L.; Calvente\, J. J.; Palomino\, M.; Minguez Espallargas\, G.; Jorda\, J. L.; Rey\, F.; Oña-Burgos\, P. ACS Appl. Mat. and Interfaces\, 2019\, 11\, 46658-46665.\n[2] Gutiérrez-Tarriño\, Olloqui-Sariego\, J. L.; Calvente\, J. J.; Minguez Espallargas\, G.; Rey\, F.; Corma\, A.; Oña-Burgos\, P. J. Am. Chem. Soc. 2020\, 142\, 19198−19208.\n[3] Martínez\, J.; Mazarío\, J.; Mínguez\, G. E.; Oña-Burgos\, P. Chem. A Eur. J. 2020\, 26\, 13659.\n[4] Martínez\, J.; Mazarío\, J.; Olloqui-Sariego\, J. L.; Oña-Burgos\, P. Adv. Sustainable Syst. 2022\, 6\, 2200096.\n[5] Galdeano-Ruano\, C.; Corma\, A.; Oña-Burgos\, P. ACS Appl. Nano Mater. 2021\, 4\, 10743.\n[6] Galdeano-Ruano\, C.; Olloqui-Sariego\, J. L.; Oña-Burgos\, P. J. of Catalysis submitted.
URL:https://fermi.univ-tlse3.fr/event/well-defined-organometallic-precursors-for-developing-tailored-catalytic-materials-pascual-ona-burgos-lpcno-seminaire-29-06-2023-14h/
LOCATION:Salle 220\, LPCNO\, INSA – LPCNO : 135 avenue de Rangueil\, toulouse\, 31077\, France
CATEGORIES:Events,LPCNO,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20230630T110000
DTEND;TZID=Europe/Paris:20230630T123000
DTSTAMP:20260423T084129
CREATED:20230619T133423Z
LAST-MODIFIED:20230621T133448Z
UID:9046-1688122800-1688128200@fermi.univ-tlse3.fr
SUMMARY:Ondes gravitationnelles : l'aube d'une nouvelle science de l'univers . - (Nicola Tamanini / Seminar/ SFP). - 30/06/2023\, 11H
DESCRIPTION:Nicola Tamanini  (Laboratoire des Deux Infinis de Toulouse\, CNRS\, Université Paul Sabatier\, Toulouse) \nLieu : Salle de conférence\, nouveau Bâtiment 3R4 \nRésumé :\nDepuis leur première détection en 2015\, les ondes gravitationnelles nous permettent d’explorer les mystères les plus obscures de l’univers\, y compris les trous noirs\, les étoiles à neutrons et les propriétés de la gravité dans des conditions extrêmes. Mais qu’est-ce que sont les ondes gravitationnelles ? Comment nous les avons découvertes ? Comment nous les utilisons aujourd’hui pour sonder l’univers ? Que vont-elles nous apporter à l’avenir ? Dans ma présentation je vais donner une réponse à toutes ces questions pour faire découvrir à toutes et à tous l’univers des ondes gravitationnelles.
URL:https://fermi.univ-tlse3.fr/event/ondes-gravitationnelles-laube-dune-nouvelle-science-de-lunivers-nicola-tamanini-seminar-sfp-30-06-2023-11h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,Seminars,SFP / SFC
ATTACH;FMTTYPE=image/png:https://fermi.univ-tlse3.fr/wp-content/uploads/2023/06/onde_gravitationnelle_SFP-e1687354433902.png
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