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DTSTART;TZID=Europe/Paris:20231212T140000
DTEND;TZID=Europe/Paris:20231212T153000
DTSTAMP:20260421T175346
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
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