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DTSTART;TZID=Europe/Paris:20231129T140000
DTEND;TZID=Europe/Paris:20231201T120000
DTSTAMP:20260421T161019
CREATED:20231128T115442Z
LAST-MODIFIED:20231130T064016Z
UID:9420-1701266400-1701432000@fermi.univ-tlse3.fr
SUMMARY:Theory days on Advances in Stochastic and Dissipative Effects. - (Meeting / LPT)\, 29/11/2023 - 1/12/2023
DESCRIPTION:Organizers : P. M. Dinh\, A. de la Lande\, and E. Suraud \nAim and objectives\nFollowing the tradition of the previous successful meetings that have started in 2009\, the Theory Days workshop aims at stimulating constructive discussions\, collaborations\, and knowledge exchange among a selected group of theoreticians. This year\, the fifteenth edition will be dedicated to Advances in Stochastic and Dissipative Effects in real-time dynamics and in ferminionic systems \nThe typical physical situations we aim at describing concern in particular the irradiation of clusters and molecules by extreme light. By extreme light\, we mean in particular high intensity lasers for which energy deposit is known to be especially important. But other « extreme » light sources such as FEL or attosecond lasers certainly also constitute highly interesting cases to explore. Real-time dynamics simulation is a valuable resource to the chemical and physical communities\, since it allows for direct mimicking of numerous time-domain experiments and provides a detailed atomistic description of chemical and physical processes and interactions. However\, to make the simulation feasible one has to recur to some approximations\, on which the accuracy of the results rely. We will focus on how to reproduce realistic situations such as photodissociation or multi-ionization within state-of-the-art methodologies such as Time-Dependent Density-Functional Theory (TDDFT). Attention will be paid to the failures of the current approximations and on how to improve. Approaches beyond TDDFT\, such as Time-Dependent Density Matrix\, stochastic TDDFT\, Trajectory Surface Hopping\, Exact factorization and Open Quantum System methods will be also discussed. \nWe plan to gather people from various groups working in this domain\, mostly in western Europe. The workshop is intended to be a working forum\, thus rather informal. The format will consist in a series of long detailed talks\, typically 1 hour (40 mn talk + 10 mn for questions) focusing in particular on ongoing problems and open issues. We thus urge participants to prepare their talks in this spirit. Ultimately a most efficient organization would consist in having a limited number of talks per representative group in order to avoid doublings. \nMore informations Here : Theory Days 2023
URL:https://fermi.univ-tlse3.fr/event/theory-days-on-advances-in-stochastic-and-dissipative-effects-meeting-lpt-29-11-2023-1-12-2023/
LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France
CATEGORIES:Events,LPT,Symposium / Congress
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20231204T110000
DTEND;TZID=Europe/Paris:20231204T123000
DTSTAMP:20260421T161019
CREATED:20231104T060231Z
LAST-MODIFIED:20231204T074808Z
UID:9413-1701687600-1701693000@fermi.univ-tlse3.fr
SUMMARY:Embedding with auxiliary particles for strongly correlated materials. - (Carlos Mejuto Zaera / LPT / Seminar). - 4/12/2023\, 11 H.
DESCRIPTION:Carlos Mejuto Zaera (SISSA\, Trieste) \nSeminar LPT\, 4/12/2023\, 11H\, 3R1\, seminar room\, 3rd floor \nSummary : \nStrong correlation in solids and molecules gives rise to a wide palette of states with highly tuneable electronic properties\, ranging from Mott insulators and unconventional superconductors all the way to efficient and selective catalytic centres. Such systems share a common underlying motif : their unique phases emerge from the competition between different energy scales. Describing such competition can be achieved within an embedding framework\, which entails identifying a small fragment of the system\, modelled explicitly\, while all the rest is substituted by some auxiliary\, often frequency-dependent potential. Still\, most embedding approaches suffer either from a limited access to observables or high computational cost. In this talk\, I will discuss the type of information that an embedding analysis can provide for complex lattice and molecular systems. Moreover\, I will present a powerful embedding framework recently introduced\, which enhances the Gutzwiller Ansatz with auxiliary states. Dynamical correlators within this method are described in terms of an effective non-interacting\, quasiparticle Hamiltonian\, subject to a self-consistency condition formulated in terms of the one-particle reduced density matrix. Despite this comparatively simple\, frequency-independent construction\, I will show that this approach can generate qualitatively correct expectation values and spectral functions in multi-orbital models. This technique alleviates the flexibility vs cost trade-off\, and is hence attractive for future applications in correlated solids and molecules\, particularly when the coupling between fragment and environment plays a decisive role.
URL:https://fermi.univ-tlse3.fr/event/tba-carlos-mejuto-zaera-lpt-seminar-4-12-2023-11-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:20231205T140000
DTEND;TZID=Europe/Paris:20231205T153000
DTSTAMP:20260421T161019
CREATED:20231203T084910Z
LAST-MODIFIED:20231204T074817Z
UID:9411-1701784800-1701790200@fermi.univ-tlse3.fr
SUMMARY:Fluctuations in an Ising ferromagnet driven by a slowly oscillating field with a constant bias (Experiment+Simulation match). - (Gloria Buendía / LPT / Seminar). - 5/12/2023\, 14H
DESCRIPTION:Gloria Buendía  (Université Simón Bolívar\, Caracas\, Venezuela) \nSeminar LPT\, 5/12/2023\, 14H\, 3R1\, seminar room\, 3rd floor \nSummary :\nWe present a numerical and theoretical study that supports and explains experimental results on anomalous magnetization fluctuations observed in a uniaxial ferromagnetic film which is forced by an oscillating field to which is added a constant bias field. We perform numerical Monte Carlo simulations of a 2D kinetic Ising model and analyze the data using a droplet model of metastable decay. Our results clearly show that the experimental results are not due to any residual magnetostatic interactions. We find that the origin of the anomalous magnetization fluctuations are not a a critical phenomenon associated with a phase transition. Rather it is a stochastic-resonance phenomena that have no counterpart in the corresponding thermodynamic phase transition\, providing a reminder that the equivalence between the dynamical phase transition to an equilibrium phase transition is only valid near the critical region.
URL:https://fermi.univ-tlse3.fr/event/fluctuations-in-an-ising-ferromagnet-driven-by-a-slowly-oscillating-field-with-a-constant-bias-experimentsimulation-match-gloria-buendia-lpt-seminar-5-12-2023-14h/
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:20231212T140000
DTEND;TZID=Europe/Paris:20231212T153000
DTSTAMP:20260421T161019
CREATED:20231210T074032Z
LAST-MODIFIED:20231211T082958Z
UID:9239-1702389600-1702395000@fermi.univ-tlse3.fr
SUMMARY:Lee-Yang zeros at O(3) and deconfined quantum critical points. - (Jonathan D’Emidio / LPT / Seminar). - 12/12/2023\, 14 H.
DESCRIPTION:Jonathan D’Emidio (DIPC & Multiverse Computing\, Saint-Sébastien) \nSeminar LPT\, 12/12/2023\, 14H\, 3R1\, seminar room\, 3rd floor \nSummary :  \nLee-Yang theory\, based on the study of zeros of the partition function\, is widely regarded as a powerful and complementary approach to the study of critical phenomena and forms a foundational part of the theory of phase transitions. Its widespread use\, however\, is complicated by the fact that it requires introducing complex-valued fields that create an obstacle for many numerical methods\, especially in the quantum case where very limited studies exist beyond one dimension. In this talk I will present a simple and statistically exact method to compute partition function zeros with general complex-valued external fields in the context of large-scale quantum Monte Carlo simulations. I will show the power of this approach by extracting critical exponents from the leading Lee-Yang zeros of 2D quantum antiferromagnets with a complex staggered field\, focusing on the Heisenberg bilayer and square-lattice J-Q models. I will also show how to introduce a complex field that couples to valence bond solid order\, giving rise to extended rings of zeros in the J-Q model with purely imaginary staggered and valence bond solid fields. \nEprint : https://arxiv.org/abs/2308.00575
URL:https://fermi.univ-tlse3.fr/event/tba-jonathan-demidio-lpt-seminar-12-12-2023-14-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:20231219T140000
DTEND;TZID=Europe/Paris:20231219T153000
DTSTAMP:20260421T161019
CREATED:20231216T044804Z
LAST-MODIFIED:20231218T094913Z
UID:9350-1702994400-1702999800@fermi.univ-tlse3.fr
SUMMARY:Simulating chiral spin liquids with tensor networks : from bosonic projected entangled pair states to fermionic projected entangled pair states. - (Sen Niu / LPT / Seminar). - 19/12/2023\, 14H
DESCRIPTION:Sen Niu (LPT) \nSeminar LPT\, 19/12/2023\, 14H\, 3R1\, seminar room\, 3rd floor \nSummary :\nChiral spin liquids (CSLs) are bosonic variant of fractional quantum Hall states realized in spin models. As a topologically ordered phase of matter\, CSLs have degenerate ground states on torus while host chiral edge modes (or entanglement spectrum) on an open disk. As numerical confirmation of CSL ground states in spin models is still a challenging problem and conventional numerical methods have various limitations\, we consider the entanglement based projected entangled pair states (PEPS) method for simulation of CSLs. Nevertheless\, the application of tensor network method to CSLs is not so straightforward due to the existence of a no-go theorem. \nIn this talk\, I will firstly introduce the background of the topological obstruction in CSLs\, and then report our recent progress. (i) We extend the original bosonic PEPS framework to describe CSLs on non-bipartite lattices. (ii) We propose the fermionic PEPS ansatz based on the parton construction. The fermionic PEPS representation for CSLs provides a faithful description of chiral edge spectrum\, which cures a long-standing issue in bosonic PEPS.
URL:https://fermi.univ-tlse3.fr/event/simulating-chiral-spin-liquids-with-tensor-networks-from-bosonic-projected-entangled-pair-states-to-fermionic-projected-entangled-pair-states-sen-niu-lpt-seminar-5-12-2023-14h/
LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France
CATEGORIES:Events,LPT,Seminars
END:VEVENT
END:VCALENDAR