Didina Serban 研究员学术报告
Title: The fermionic point of the q-deformed Haldane-Shastry model
Speaker: Didina Serban
Affiliation: Université Paris–Saclay and IPhT, CEA Saclay, France（法国巴黎萨克雷大学及理论物理研究所)
Time: 14:00-15:00, Monday, 19th January, 2026 (UTC+8, Beijing Time)
Venue: Room 1502, Shing-Tung Yau Center, Yifu Architecture Building, Sipailou Campus of Southeast University, Nanjing(东南大学四牌楼校区逸夫建筑馆丘成桐中心1502室)
Inviter: Yunfeng Jiang（江云峰）
Abstract
The talk will present an integrable anisotropic (XXZ-like) deformation of the Haldane-Shastry spin chain. Thanks to the long-range nature of the spin-spin interaction, the chain possesses quantum affine symmetry that q-deforms the Yangian symmetry. At q=i the model can be written in terms of non-unitary fermions, and the symmetry becomes extended gl(1|1) symmetry. The spectrum is radically different for even and odd lengths of the chain. In the former case all the conserved quantities are nilpotent, in the latter the dispersion relation is linear and the spectrum displays features of fractional statistics.
Speaker
Didina Serban is currently a researcher at the Université Paris–Saclay and the Institut de Physique Théorique, CEA, Saclay in France. Her fields of research interests include mathematical physics, quantum field theory and string theory.