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DTSTART;TZID=Europe/Paris:20221201T140000
DTEND;TZID=Europe/Paris:20221201T160000
DTSTAMP:20260513T230121
CREATED:20221129T140041Z
LAST-MODIFIED:20221130T075502Z
UID:8659-1669903200-1669910400@fermi.univ-tlse3.fr
SUMMARY:Modelling low-energy electron induced chemistry (Fabris Kossoski / LCPQ / Seminar) – 01/12/2022\, 14 H
DESCRIPTION:Fabris Kossoski\, post-doc\, LCPQ \nSummary : \n \nThe encounter of a low-energy electron with a molecule gives rise to electron-induced chemistry\, which is known to play key roles in fields as diverse as radiobiology\, material sciences\, astrochemistry\, and plasma-based technologies. However\, there are still major open questions about the underlying mechanisms of molecular dissociation. This project aims at filling these knowledge gaps. It is organized in two axes\, to be developed in parallel\, the first one devoted to applications to chemically relevant problems\, and the second one concerning methodological and computational developments. On the application axis\, I aim at providing a detailed mechanistic picture on how electron-induced chemistry unfolds\, and to address the exact role of such processes regarding biological\, technological\, and astrochemical motivations. On the methodological axis\, developments will take place along three fronts: electronic structure methods\, electron scattering methods\, and mixed quantum-classical nonadiabatic dynamics. The project is intended to be developed at the LCPQ lab\, within the Photochimie theorique et computationnelle team.
URL:https://fermi.univ-tlse3.fr/event/modelling-low-energy-electron-induced-chemistry-fabris-kossoski-lcpq-seminar-01-12-2022-14-h/
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:20221202T113000
DTEND;TZID=Europe/Paris:20221202T130000
DTSTAMP:20260513T230121
CREATED:20221129T090022Z
LAST-MODIFIED:20221130T075524Z
UID:8686-1669980600-1669986000@fermi.univ-tlse3.fr
SUMMARY:Thermal Hall effect in quantum materials (Louis TAILLEFER / SFP). - 2/12/2022\, 11H30
DESCRIPTION:Louis TAILLEFER (Institut quantique\, Université de Sherbrooke\, Sherbrooke\, Canada et IRL Frontières quantiques\, CNRS\, CIFAR) \nLieu : Salle de séminaire\, 3ème étage du bâtiment 3R1 – B4 (3e étage LPT) \nRésumé : \nThe recent observation of a thermal Hall effect in a number of insulators raises the tantalizing possibility that this experimental probe could be used to detect exotic excitations like Majorana fermions\, chiral magnons or spinons – in particular in magnetic materials that are considered good candidates for hosting spin-liquid states. \nIn this talk\, I will review the subject of the thermal Hall effect in quantum materials and show that in many cases it is in fact phonons that are responsible for the effect\, as in cuprate superconductors and Mott insulators\, for example. This raises the fascinating question of the mechanism by which phonons generate a thermal Hall response in the presence of a magnetic field – a subject of active theoretical interest. \nVoir ici  \n\n 
URL:https://fermi.univ-tlse3.fr/event/thermal-hall-effect-in-quantum-materials-louis-taillefer-sfp-2-12-2022-11h30/
LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France
CATEGORIES:Events,Seminars,SFP / SFC
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20221206T140000
DTEND;TZID=Europe/Paris:20221206T160000
DTSTAMP:20260513T230121
CREATED:20221205T110039Z
LAST-MODIFIED:20221205T143446Z
UID:8525-1670335200-1670342400@fermi.univ-tlse3.fr
SUMMARY:Frustrating tensor networks (Bram Vanhecke / Seminar / LPT). - 6/12/2022
DESCRIPTION:Bram Vanhecke (Université de Vienne)
URL:https://fermi.univ-tlse3.fr/event/tba-bram-vanhecke-seminar-lpt-6-12-2022/
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:20221213T140000
DTEND;TZID=Europe/Paris:20221213T170000
DTSTAMP:20260513T230121
CREATED:20221209T070047Z
LAST-MODIFIED:20221209T071840Z
UID:8717-1670940000-1670950800@fermi.univ-tlse3.fr
SUMMARY:Wigner systems from first principles (Miguel Escobar Azor / LCPQ / These). - 13 decembre 2022\, 14H
DESCRIPTION:Miguel Escobar Azor\, LCPQ\, seminary room\, 3rd floor -3r1B4 \n  \nSupervisors : Arjan Berger and Stefano Evangelisti \nAbstract: \nThis thesis aims to study Wigner localization at very low densities. Almost a century ago\, Eugene Wigner predicted that a system consisting of interacting electrons in a neutralizing uniform background would form a crystalline structure at sufficiently low density with the electrons localized at lattice sites. His argument can be understood by considering the dependence of the kinetic and repulsive energies on the Wigner-Seitz radius\, which is the radius of a sphere that contains\, on average\, one electron or\, equivalently\, half the average distance between nearest-neighbor electrons. While the kinetic energy scales as the inverse of the square of the Wigner-Seitz radius\, the repulsive energy scales as the inverse of the Wigner-Seitz radius. Consequently\, in the low-density limit (large Wigner-Seitz radius)\, the Hamiltonian is dominated by the repulsive energy leading the electrons to localize in space. When many electrons are present\, the electrons will localize at crystallographic sites forming a so-called Wigner crystal. More generally speaking\, one speaks of Wigner localization whenever electrons localize due to the electron-electron repulsion being dominant with respect to the kinetic energy. For a few electron systems\, one also speaks of a Wigner molecule. To study Wigner localization\, we have performed three correlated studies. The first of them consists of confining two electrons to a ring. To do so\, we work with M-equal evenly distributed Gaussian orbitals as basis set and compute the energies and wave function through exact diagonalization of the Hamiltonian\, yielding exact results to a given basis set. We limited ourselves to two electrons since it is sufficient to observe the Wigner localization while simultaneously allowing us to obtain numerically exact results by exact diagonalization of the Hamiltonian. We have verified our approach and its implementation by comparing analytical results for one electron confined to a strictly 1D ring. For this case\, we have also analyzed the Wigner localization by several possible indicators\, notably the 2-body reduced density matrix\, the localization tensor\, and the particle-hole entropy. We have observed the Wigner localization in the two-body reduced density matrix and the localization tensor. Instead\, the Wigner localization cannot easily be detected in the particle-hole entropy. Intending to move to higher dimensions\, we have formulated the Clifford boundary conditions\, which consist of the definition of a d-dimensional supercell and then modify its topology into a toroidal topology by joining opposite sides of the cell without deformation. This procedure yields a supercell with the topology of a d-Clifford torus which is a flat\, closed d-dimensional real Euclidean space embedded in a complex d-dimensional Euclidean space. In this framework\, a circle and a line are topologically equivalent. We will explore the system’s translational symmetry\, allowing us to evaluate efficiently the one- and two-electron integrals. To validate our approach\, we developed a semi-classical model that becomes exact at low densities and compared the energies of both approaches. Since strong electron correlation drives the Wigner localization\, the ab-initio study of this phenomenon requires accurate quantum-chemistry approaches such as Full configuration interaction or multiconfigurational methods like complete active space self-consistent field to obtain highly accurate energies and wave functions in both the low-correlation and the high-correlation regimes. In this Second study and the first one\, we will use the exact diagonalization of the Hamiltonian to obtain numerically exact results. Lastly\, we will present the generalization of our approach to N-electron systems.
URL:https://fermi.univ-tlse3.fr/event/wigner-systems-from-first-principles-miguel-escobar-azor-lcpq-these-13-decembre-2022-14h/
LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France
CATEGORIES:Events,HDR / Thesis,LCPQ
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20221215T110000
DTEND;TZID=Europe/Paris:20221215T123000
DTSTAMP:20260513T230121
CREATED:20221209T063037Z
LAST-MODIFIED:20230208T081054Z
UID:8726-1671102000-1671107400@fermi.univ-tlse3.fr
SUMMARY:Microscopie électronique en actif sur Atalante au CEA de Marcoule (Gauthier Jouan / Seminar / CEMES). - 15/12/2022\, 11H
DESCRIPTION:Les séminaires du jeudi\n \nGauthier Jouan\, Atalante – CEA Marcoule \nLien zoom : https://cnrs.zoom.us/j/98620558928?pwd=YVFwbGN6eE9qbXpXNGpvKzhHczdzdz09 \nRésumé :Les caractérisations de matériaux radioactifs impliquent de travailler dans des conditions de sureté\, sécurité et radioprotection particulières. Dans ce cadre\, les appareils utilisés sont nucléarisés de façon à travailler avec des appareils adaptés aux différents échantillons à caractériser (type d’émission\, débit de dose\, contaminant\, …). Une première partie présentera les différentes modifications technologiques réalisées sur trois microscopes électroniques à balayage en fonctionnement dans l’installation nucléaire d’Atalante du CEA de Marcoule. Cette partie montrera les complexités de mise en œuvre de l’utilisation de ce type d’équipement en milieu actif (exploitation\, maintenance).\nDans un second temps\, des exemples de caractérisations réalisées sur des échantillons actifs à différentes étapes du cycle du combustible seront présentées : \n\nla nano-compression in situ de combustible MOX pour la coulabilité dans les procédés de fabrication;\nles microstructures et analyses élémentaires EDS/WDS de boues issues du démantèlement d’une usine de recyclage du combustibles usés;\nles caractérisations microsonde\, MEB et MET d’un verre industriel de déchet ultime de haute activité.\n\nPour clôturer ce séminaire\, une dernière partie sera consacrée à la description du projet de nucléarisation d’un MEB-FIB en actif en cours de montage au sein du laboratoire.
URL:https://fermi.univ-tlse3.fr/event/microscopie-electronique-en-actif-sur-atalante-au-cea-de-marcoule-gauthier-jouan-seminar-cemes-15-12-2022-11h/
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:20221215T140000
DTEND;TZID=Europe/Paris:20221215T170000
DTSTAMP:20260513T230121
CREATED:20221209T060056Z
LAST-MODIFIED:20221209T071822Z
UID:8720-1671112800-1671123600@fermi.univ-tlse3.fr
SUMMARY:Contrôle optimal de condensats de Bose-Einstein dans un réseau optique (Nathan Dupont / LCAR / These). - 15/12/2022\, 14H
DESCRIPTION:Nathan Dupont\, LCAR\, Amphi Daurat (Bâtiment U3) \nDirecteur de thèse : David Guéry-Odelin. \nRésumé : Le domaine de la simulation quantique vise à émuler des systèmes quantiques complexes sur des systèmes plus simples à observer et à contrôler. Ces vingt dernières années\, les gaz d’atomes ultrafroids sur réseau optique se sont démarqués comme une plateforme versatile et hautement contrôlable pour la simulation quantique. Les travaux expérimentaux effectués durant ma thèse s’inscrivent dans le développement de ce domaine. Ces expériences ont été réalisées avec des condensats de Bose-Einstein (CBE ; des ondes de matière macroscopiques) placés dans un réseau optique unidimensionnel finement contrôlable en phase et en amplitude. Nous nous sommes intéressés à des effets liés à la dynamique de ces ondes de matière dans ce potentiel périodique\, et à la manière dont on peut se servir de cette dynamique pour contrôler l’état quantique des CBE dans le réseau optique. Ma soutenance de thèse portera plus précisément sur nos récents travaux (https://arxiv.org/abs/2105.05667 et https://arxiv.org/abs/2210.11112) traitant de la mise en place d’un protocole de contrôle optimal quantique afin de contrôler l’état externe des CBE dans le réseau\, ainsi que sur les problématiques liées à la mesure de ces états.
URL:https://fermi.univ-tlse3.fr/event/controle-optimal-de-condensats-de-bose-einstein-dans-un-reseau-optique-nathan-dupont-lcar-these-15-12-2023-14h/
CATEGORIES:Events,HDR / Thesis,LCAR
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