{"id":9239,"date":"2023-12-10T08:40:32","date_gmt":"2023-12-10T07:40:32","guid":{"rendered":"https:\/\/fermi.univ-tlse3.fr\/?post_type=tribe_events&p=9239"},"modified":"2023-12-11T09:29:58","modified_gmt":"2023-12-11T08:29:58","slug":"tba-jonathan-demidio-lpt-seminar-12-12-2023-14-h","status":"publish","type":"tribe_events","link":"https:\/\/fermi.univ-tlse3.fr\/fr\/home\/event\/tba-jonathan-demidio-lpt-seminar-12-12-2023-14-h\/","title":{"rendered":"Lee-Yang zeros at O(3) and deconfined quantum critical points. – (Jonathan D\u2019Emidio \/ LPT \/ Seminar). – 12\/12\/2023, 14 H."},"content":{"rendered":"

Jonathan D\u2019Emidio<\/strong><\/span> (DIPC & Multiverse Computing, Saint-S\u00e9bastien)<\/span><\/p>\n

Seminar LPT, 12\/12\/2023, 14H, 3R1, seminar room, 3rd floor<\/span><\/p>\n

Summary<\/strong> : <\/span><\/p>\n

Lee-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.<\/p>\n

Eprint : https:\/\/arxiv.org\/abs\/2308.00575<\/a><\/p>\n

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