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Conference on "Mathematical properties of large quantum systems"
Organizers: Maria J. Esteban (CNRS), Mathieu Lewin (CNRS), Robert Seiringer (McGill, Montréal) & Jan Philip Solovej (Copenhagen)


Daniel Ueltschi (Warwick, UK): "Phase diagram for spin 1 quantum Heisenberg models"
Monday 17 June 2013, 14:30 - 15:15
Amphi Hermite


I will discuss quantum lattice systems where each site is occupied by a particle of spin 1, and with nearest-neighbour SU(2)-invariant interactions. A random loop representation offers interesting insights for certain parameters. I will present results about magnetic ordering in dimensions 5 and higher. While the existence of some phase transition is proved, its nature is not clear yet.