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DTSTART;TZID=Europe/Paris:20211005T140000
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DTSTAMP:20260425T061822
CREATED:20210829T093001Z
LAST-MODIFIED:20211011T120415Z
UID:6050-1633442400-1633449600@fermi.univ-tlse3.fr
SUMMARY:Effects of spin-phonon coupling in frustrated Heisenberg models (Francesco Ferrari / LPT / Seminary) - 5/10\, 14H.
DESCRIPTION:Francesco Ferrari (Université Goethe de Francfort) \n\nThe existence and stability of spin-liquid phases represent a central topic in the field of frustrated magnetism. While a few examples of spin-liquid ground states are well established in specific models (e.g. the Kitaev model on the honeycomb lattice)\, recent investigations have suggested the possibility of their appearance in several Heisenberg-like models on frustrated lattices [1]. An important related question concerns the stability of spin liquids in the presence of small perturbations in the Hamiltonian. \nIn this respect\, the magnetoelastic interaction between spins and phonons represents a relevant and physically motivated perturbation\, which has been scarcely investigated so far. We have studied the effect of the spin-phonon coupling on prototypical models of frustrated magnetism\, adopting a variational framework based upon Gutzwiller-projected wave functions\, implemented with a spin-phonon Jastrow factor\, providing a full quantum treatment of both spin and phonon degrees of freedom [2]. The results on the frustrated J1-J2 Heisenberg model on one- and two-dimensional (square) lattices show that\, while a valence-bond crystal is prone to lattice distortions\, a gapless spin liquid is stable for small spin-phonon couplings [3]. \n\n[1] L. Savary\, L. Balents\, Rep. Prog. Phys. 80\, 016502 (2017).\n[2] F. Ferrari\, R. Valentí\, F. Becca\, Phys. Rev. B 102\, 125149 (2020).\n[3] F. Ferrari\, R. Valentí\, F. Becca\, Phys. Rev. B 104\, 035126 (2021).\n\n\n 
URL:https://fermi.univ-tlse3.fr/event/tba-francesco-ferrari-lpt-seminary/
LOCATION:Visio
CATEGORIES:Events,LPT,Seminars
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