BEGIN:VCALENDAR VERSION:2.0 PRODID:-//FeRMI - ECPv6.18.0//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:20250330T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20251026T010000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20260329T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20261025T010000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20270328T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20271031T010000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261009T110000 DTEND;TZID=Europe/Paris:20261009T123000 DTSTAMP:20260928T124936Z CREATED:20260926T105048Z LAST-MODIFIED:20260928T124936Z UID:12444-1791543600-1791549000@fermi.univ-tlse3.fr SUMMARY:Solving Chemical Problems With Rotational and Laser Spectroscopy. - ( Dr. Emilio J. Cocinero / LCAR / Seminar). - 9 / 10 /2026\, 11H DESCRIPTION:Séminaire LCAR \n Dr. Emilio J. Cocinero\, Universidad del País Vasco\, EHU URL:https://fermi.univ-tlse3.fr/event/solving-chemical-problems-with-rotational-and-laser-spectroscopy-dr-emilio-j-cocinero-lcar-seminar-9-10-2026-11h/ 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:20261013T140000 DTEND;TZID=Europe/Paris:20261013T170000 DTSTAMP:20260929T063236Z CREATED:20260926T084516Z LAST-MODIFIED:20260929T063236Z UID:12475-1791900000-1791910800@fermi.univ-tlse3.fr SUMMARY:From models to real systems: implementation and applications of the multichannel dyson equation.- (Stefano Paggi / LPT / Thesis). -13/10/2026\, 2 p.m. DESCRIPTION:PhD defense \nStefano Paggi – LPT\, Salle de séminaire du 3R1\, 3ème étage\, 2 p.m. \nAbstract :\nThe multichannel Dyson equation (MCDE) connects many-body Green’s functions via a multichannel many-body self-energy. Two or more many-body Green’s functions can be coupled in the MCDE. Linking one-body and three-body Green’s functions treats satellites and quasiparticles in photoemission on equal footing\, whereas linking two-body and four-body Green’s functions does the same for single and double neutral excitations in optical absorption. Motivated by the exact result of the photoemission spectra of the standard Hubbard dimer\, the work applies the MCDE to the extended Hubbard dimer\, an H$_2$-like model\, which results in an overall better estimation of the photoemission spectrum\, as well as the ground state energy and the HOMO-LUMO gap compared to standard approaches like $GW$ and second Born. We also investigated neutral excitations of a two-level helium-like model using an MCDE coupling two- and four-body Green’s functions. The MCDE returns single and double neutral excitations close to the exact value\, unlike standard approaches like BSE@GW. In order to apply the MCDE to real molecules\, we developed an implementation in a many-body code using \python$ $ and \fortran$ $\, which just needs as input parameters the restricted Hartree-Fock orbital energies\, basis size\, and two-electron repulsion integrals. Using a spin-adapted effective Hamiltonian and Haydock-Lanczos algorithm\, the spectroscopy-specialized code is able to calculate spectra of atoms and molecules. This paves the way for the implementation of the MCDE to other spectroscopies. Currently our group is implementing the MCDE for neutral excitations\, as well as double ionizations. \n\n \n \n  URL:https://fermi.univ-tlse3.fr/event/from-models-to-real-systems-implementation-and-applications-of-the-multichannel-dyson-equation-stefano-paggi-lpt-thesis-13-10-2026-14h/ LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France CATEGORIES:Events,HDR / Thesis,LPT END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261015T140000 DTEND;TZID=Europe/Paris:20261015T153000 DTSTAMP:20260928T074737Z CREATED:20260925T062941Z LAST-MODIFIED:20260928T074737Z UID:12437-1792072800-1792078200@fermi.univ-tlse3.fr SUMMARY:Quantum photonics using colour centres in diamond. - (Christophe Couteau/ LPCNO / Seminar). - 15/10/2026\, 14H DESCRIPTION:Séminaire du LPCNO \nChristophe Couteau\, L2N\, UTT\, Troyes \nSeminar LPCNO\, 15/10/2026\, 14H URL:https://fermi.univ-tlse3.fr/event/quantum-photonics-using-colour-centres-in-diamond-christophe-couteau-lpcno-seminar-15-10-14h/ 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:20261016T090000 DTEND;TZID=Europe/Paris:20261016T130000 DTSTAMP:20260929T063200Z CREATED:20260924T123406Z LAST-MODIFIED:20260929T063200Z UID:12473-1792141200-1792155600@fermi.univ-tlse3.fr SUMMARY:Waveguide quantum electrodynamics with atomic rings around an optical nanofiber.- (Juliette Jiménez Jaimes / LCAR / Thesis). -16/10/2026\, 9 a.m. DESCRIPTION:PhD defense \nJuliette Jiménez Jaimes LCAR\, Salle de conférence\, Bat. 3R4\, 9 a.m. \nAbstract :\nThis thesis investigates the collective interaction between regular circular atomic arrays and the electromagnetic field of an optical nanofiber. The central question is how the discrete rotational symmetry of the atomic geometry\, combined with the modal structure and long-range propagation of the nanofiber field\, can be used to control both spontaneous emission and scattering of guided photons. For a single atomic ring\, this symmetry produces mode-selective scattering: different fiber guided modes couple to different eigenmodes of the atomic ring and can consequently experience very distinct reflection and transmission spectra at the same optical frequency. For two rings\, an additional exchange parity and the propagation phase accumulated between the rings control the relative coupling of the collective modes of the incident and outgoing fields. Finally\, finite stacks of rings combine the previously mentioned selection rule with longitudinal interference and Bragg-type coherent build-up. They can behave as mode-selective atomic mirrors\, and when two guided modes are assigned to the reflected and transmitted ports\, as prototypes of two-mode photon routers. \n\n \n \n  URL:https://fermi.univ-tlse3.fr/event/waveguide-quantum-electrodynamics-with-atomic-rings-around-an-optical-nanofiber-juliette-jimenez-jaimes-lcar-thesis-16-10-2026-9h/ LOCATION:Salle de conférence\, Bâtiment 3R4 CATEGORIES:Events,HDR / Thesis,LCAR END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261020T090000 DTEND;TZID=Europe/Paris:20261020T120000 DTSTAMP:20260929T063052Z CREATED:20260923T082005Z LAST-MODIFIED:20260929T063052Z UID:12419-1792486800-1792497600@fermi.univ-tlse3.fr SUMMARY:Ab initio modeling of electronic and magnetic properties of small Wigner crystals.- (Daniele Lagasco LPT / These). -20/10/2026\, 2 p.m. DESCRIPTION:PhD defense \nDaniele Lagasco LPT\, Salle de conférence\, Bat. 3R4 – 2 p.m. \nAbstract:\nWigner crystallization\, proposed in 1934\, predicts that in an electronic liquid at sufficiently low density — where the Coulomb potential dominates over the kinetic energy — the electrons arrange themselves into an ordered structure. This work is motivated by a recent observation of few-electron Wigner crystals in a quasi-one-dimensional system. The objective of the thesis is to calculate the charge distribution and the magnetic exchange coupling of N electrons in a one-dimensional system using ab initio methods. In the first method\, we obtain an analytical expression for the exchange coupling of a two-electron Wigner dimer confined to a one-dimensional space in the low-density limit\, using two complementary approaches. The first consists of the analytical solution of the Schrödinger equation for two electrons\, assuming the center of mass of the two particles to be fixed. Under this approximation\, the original problem reduces to a second-order differential equation\, which is solved in terms of Whittaker functions. The second approach is based on the quasiclassical\, or Wentzel-Kramers-Brillouin (WKB)\, approximation. The two approaches yield compatible results in their overlapping region of validity. In the second method\, we model the N-electron liquid in order to reproduce the experimental setup we aim to interpret. We adopt a full configuration interaction approach to capture electron correlation. With this approach\, we obtain accurate electronic density profiles of small one-dimensional Wigner crystals with N = 2 to N = 4 electrons\, which clearly show the localization of the electrons. Finally\, we present a simple approach for obtaining the exchange coupling constant by mapping our ab initio results onto a Heisenberg Hamiltonian. \n\n \n \n  URL:https://fermi.univ-tlse3.fr/event/modelisation-de-petits-cristaux-de-wigner-daniele-lagasco-lpt-these-20-10-2026/ LOCATION:Salle de conférence\, Bâtiment 3R4 CATEGORIES:Events,HDR / Thesis,LPT END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261026T090000 DTEND;TZID=Europe/Paris:20261030T170000 DTSTAMP:20260928T074756Z CREATED:20260920T121518Z LAST-MODIFIED:20260928T074756Z UID:12423-1793005200-1793379600@fermi.univ-tlse3.fr SUMMARY:Journées de la Matière Condensée 2026 (JMC) du 26 au 30 octobre 2026 (Toulouse) DESCRIPTION:Journées de la Matière Condensée \nPrésentation : \nles Journées de la Matière Condensée (JMC) sont organisées toutes les années paires par la Division de Physique de la Matière Condensée de la Société Française de Physique (SFP).\nLes thématiques abordées couvrent l’ensemble des domaines relevant de la matière condensée\, des concepts aux applications. Le succès de ces journées en fait le plus grand congrès national de physique de la Matière Condensée en France (500-700 participants). \nRetrouvez tous les détails ici URL:https://fermi.univ-tlse3.fr/event/journees-de-la-matiere-condensee-2026-jmc-du-26-au-30-octobre-2026-toulouse/ LOCATION:Auditorium Marthe Condat\, 118 route de narbonne\, Toulouse\, 31062\, France CATEGORIES:Events,SFP / SFC,Symposium / Congress END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261103T140000 DTEND;TZID=Europe/Paris:20261103T153000 DTSTAMP:20260928T074804Z CREATED:20260917T070217Z LAST-MODIFIED:20260928T074804Z UID:12451-1793714400-1793719800@fermi.univ-tlse3.fr SUMMARY:Avancées sur les réseaux métallo-organiques frustrés à géométrie pyrochlore centrée anisotrope. - (Naïmo Davier / LPT / Seminar). -3/11/2026\, 14H DESCRIPTION:Séminaire LPT \nNaïmo Davier (LOMA\, Bordeaux) \nSeminar LPT\, 3/11/2026\, 14H\, 3R4\, salle de conférence \nSummary \nRecent experimental realizations of metal–organic centered-pyrochlore materials such as Mn(ta)$_2$\, have motivated detailed theoretical studies of this lattice. So far\, isotropic models have successfully reproduced experimental observations above 1 Kelvin [1\,2]\, but open questions remain about the low-temperature ordered phase and the precise nature of the proximate spin liquids. At such low energy scales\, weak spin–orbit coupling might play a role which motivates the study of the fully anisotropic exchange Hamiltonian on the centered-pyrochlore lattice\, following analogous work previously carried out for the conventional pyrochlore lattice [3]. \nOur study reveals that\, despite its close relation to the pyrochlore lattice\, the addition of a central site has profound consequences. First\, the two additional degrees of freedom per unit cell introduce extra fluctuation channels\, stabilizing a much broader variety of spin-liquid phases. Most of these phases exhibit multifold pinch points\, associated with fractonic physics. Second\, the distinct symmetry properties of the central sites allow them to behave differently from the pyrochlore sites. This leads to mixed phases in which one family of sites partially orders while the other realizes a classical spin liquid phase. It also enables a peculiar spin-liquid phase in which the structure factor of the pyrochlore sites displays pinch points\, whereas the contribution from the central sites alone does not. This means that the spin degrees of freedom of the spin liquid phase splits into a Coulomb phase with a zero-divergence\, and an exponentially decaying spin liquid with potential fragile topology. \nBeyond these general results\, this framework allows us to revisit the low-temperature phase realized in Mn(ta)$_2$ thanks to NMR and neutrons experiments\, shining a new light on the phase realized by this material. \n\n[1] R. P. Nutakki et al.\, Physical Review Research 5\, L022018 (2023).\n[2] R. P. Nutakki et al.\, SciPost Physics 15\, 040 (2023).\n[3] H. Yan et al.\, Physical Review B 95\, 094422 (2017). URL:https://fermi.univ-tlse3.fr/event/avancees-sur-les-reseaux-metallo-organiques-frustres-a-geometrie-pyrochlore-centree-anisotrope-naimo-davier-lpt-seminar-3-11-2026-14h/ LOCATION:Salle de conférence\, Bâtiment 3R4 CATEGORIES:Events,LPT,Seminars END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20261203T140000 DTEND;TZID=Europe/Paris:20261203T153000 DTSTAMP:20260928T074809Z CREATED:20260915T062446Z LAST-MODIFIED:20260928T074809Z UID:12434-1796306400-1796311800@fermi.univ-tlse3.fr SUMMARY:Microwave heating for direct biogas conversion. - (David Farrusseng / LPCNO / Seminar). - 3/12\, 14H DESCRIPTION:Séminaire du LPCNO \nDavid Farrusseng\, IRCELyon\,Lyon \nSeminar LPCNO\, 3/12/2026\, 14H URL:https://fermi.univ-tlse3.fr/event/microwave-heating-for-direct-biogas-conversion-david-farrusseng-lpcno-seminar-3-12-14h/ LOCATION:Salle 220\, LPCNO\, INSA – LPCNO : 135 avenue de Rangueil\, toulouse\, 31077\, France CATEGORIES:Events,LPCNO,Seminars END:VEVENT END:VCALENDAR