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DTSTART;TZID=Europe/Paris:20260716T110000
DTEND;TZID=Europe/Paris:20260716T120000
DTSTAMP:20260713T081226Z
CREATED:20260713T081143Z
LAST-MODIFIED:20260713T081226Z
UID:12416-1784199600-1784203200@fermi.univ-tlse3.fr
SUMMARY:Topological phases of the bilinear-biquadratic spin-1 chain with single-ion anisotropy. - (Zakaria Jouini / LPT / Seminar). -16/07/2026\, 11H
DESCRIPTION:Séminaire LPT \nZakaria Jouini (EPFL) \nSeminar LPT\, 16/07/2026\, 11H\, 3R4\, salle de conférence \nSummary \nSince Haldane’s prediction of a finite spin gap in integer-spin chains\, the spin-1 chain has served as a paradigmatic model of quantum magnetism. Beyond the Heisenberg interaction\, the most general SU(2)-invariant model includes a biquadratic interaction\, often completed by an on-site anisotropy\, typical of spin-1 ions in solids. \nIn this talk\, I will present an approach combining bosonization and Bethe ansatz to show that dominant biquadratic interactions in the presence of an on-site anisotropy stabilize a gapped topological phase\, in a region of the phase diagram previously identified by numerical studies as critical with central charge c=2. I will argue that this phase is a new realization of the Haldane phase in the spin-1 chain\, characterized by hidden quadrupolar order\, and I will discuss the prospects and implications for its experimental realization.
URL:https://fermi.univ-tlse3.fr/event/topological-phases-of-the-bilinear-biquadratic-spin-1-chain-with-single-ion-anisotropy-sariah-al-saati-lpt-seminar-16-07-2026-11h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
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