报告题目 (Title)：Lieb-Schultz-Mattis constraints for 3D quantum paramagnets（三维量子顺磁体的Lieb-Schultz-Mattis约束）
报告人 (Speaker)：刘春骁 研究员（法国国家科学研究中心、巴黎萨克雷大学固体物理实验室）
报告时间 (Time)：2026年1月21日（周三）15:00-16:30
报告地点 (Place)：宝山校区G601
邀请人(Inviter)：钟建新
主办部门：量子科技研究院/理学院物理系
报告摘要：
Quantum
paramagnets represent intriguing quantum phases that evade ordering
even at absolute zero temperature. While detecting their presence is
relatively straightforward, unraveling their fundamental nature can be a
challenging task. In this talk, I will present the complete
Lieb-Schultz-Mattis (LSM) constraints that we recently obtained in [1] —
applicable to all 3D magnets — that prohibit certain 3D quantum
paramagnets from being a “trivial” one. I will explain the usage of our
results, and highlight the topological response theory underlying these
LSM constraints which reveal information about symmetry, excitations,
and lattice defects in any 3D magnets.
[1] Liu & Ye, SciPost Phys. 18, 161 (2025).