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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20231204T110000
DTEND;TZID=Europe/Paris:20231204T123000
DTSTAMP:20260422T172238
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:20260422T172238
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:20260422T172238
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:20231214T150000
DTEND;TZID=Europe/Paris:20231214T163000
DTSTAMP:20260422T172238
CREATED:20231209T080611Z
LAST-MODIFIED:20231211T083012Z
UID:9508-1702566000-1702571400@fermi.univ-tlse3.fr
SUMMARY:L’esprit scientifique et l’appareil psychique. - (Marc Thiberge /  Seminar / CEMES). - 14/12/2023\, 15H
DESCRIPTION:Les séminaires du jeudi\n \nMarc Thiberge\,   Médecin\, Psychiatre\, Psychanalyste\, Membre de l’ex École freudienne de Paris\, cofondateur de l’Invention Freudienne et de l’Association A.L.T.E.R.S \nRésumé :\nCe que les sciences visent\, n’est-ce pas depuis l’épistémé des grecs jusqu’aux sciences modernes\, d’échapper à toute subjectivité et de décentrer notre point de vue?\nMais si c’est la dimension subjective du sujet qui fait humanité\, comment poser la question du sujet de façon matérialiste?\nNous sommes devenus aux dires d’un auteur comme Bruno Latour\, des enfants de GAIA.\nComment juguler les incendies qui font de plus en plus de l’humanité moderne\, un collectif d’incendiaires qui pourrait faire regretter à Prométhée son don du feu?
URL:https://fermi.univ-tlse3.fr/event/lesprit-scientifique-et-lappareil-psychique-marc-thiberge-seminar-cemes-14-12-2023-15h/
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:20231214T150000
DTEND;TZID=Europe/Paris:20231214T170000
DTSTAMP:20260422T172238
CREATED:20231209T063906Z
LAST-MODIFIED:20231211T083020Z
UID:9430-1702566000-1702573200@fermi.univ-tlse3.fr
SUMMARY:Tuning the optoelectronic properties of TMD monolayers with dielectric environment\, photochemical processes\, and strain. - (George Kioseoglou / LPCNO / Seminar). - 14/12/2023\, 15H
DESCRIPTION:George Kioseoglou\, University of Crete\, Greece \nSéminaire LPCNO\, seminar room\, INSA\, Build. 27\, Room 2.20 (2nd floor left) \nSummary :\nMonolayers of MX2-type (M=Mo or W and X=S or Se) Transition Metal Dichalcogenides (TMDs)\,\nexhibit promising potential for future 2D nanoelectronics owing to their unique optoelectronic properties.\nIn this seminar\, I will present methods for controlling their optical and electronic characteristics through\nthe engineering of their dielectric environment\, employing photochemical methods\, and applying\nmechanical strain.\nIn particular\, we investigate WS2 monolayers on pre-patterned Si/SiO2 substrates with cylindrical\nwells of 3 μm in diameter\, analyzing strained and suspended areas. Raman mapping experiments quantify\nstrain\, revealing a 10-fold enhanced photoluminescence efficiency with strong neutral excitonic emission\nin suspended areas. TMD optoelectronic properties are chemically controlled by modulating the Fermi level\nusing UV-assisted photochlorination processes in WS2 [1\,2] and WSe2 [3] monolayers. Systematic shifts\nand relative intensities between neutral and charged excitons indicate a controllable decrease in electron\ndensity\, switching WSe2 from n-type to p-type semiconductor. Validation of chlorine species and DFT\ncalculations [4] predict p-type doping through chlorine adsorption on selenium vacancy sites. Investigating\nisotropic\, biaxial strain at room temperature on WS2 monolayers shows a strong shift on the order of ~130\nmeV per % of strain in neutral exciton emission and a decrease in circular polarization degree [5]. The\nanalysis reveals the interplay of energy and polarization relaxation channels\, as well as variations in the\nexciton oscillator strength affecting long-range exchange interactions. \n\n[1] I. Demeridou\, et al. 2D Mater. 6\, 015003 (2018)\n[2] I. Demeridou\, et al. Appl. Phys. Lett. 118\, 123103 (2021)\n[3] E. Katsipoulaki\, et al.\, 2D Mater. 10\, 045008 (2023)\n[4] G. Vailakis\, et al. Phys. Rev. Mater 7\, 024004 (2023)\n[5] G. Kourmoulakis\, et al.\, Appl. Phys. Lett. 123\, (2023) in print
URL:https://fermi.univ-tlse3.fr/event/tuning-the-optoelectronic-properties-of-tmd-monolayers-with-dielectric-environment-photochemical-processes-and-strain-george-kioseoglou-lpcno-seminar-14-12-2023-15h/
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:20231219T140000
DTEND;TZID=Europe/Paris:20231219T153000
DTSTAMP:20260422T172238
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
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