报告人：吴建达 副教授（上海交通大学）

题目：Exotic emergences in low-dimensional quantum Ising models

时间：2025年9月22日（周一）上午10：00

地点：格致楼3016

联系人：赵继泽

报告摘要：

When the transverse-field Ising chain (TFIC) at its quantum critical point is perturbed by a longitudinal field along Ising spin direction, it emerges as an integrable model containing eight particles with their scattering matrices and mass spectrum organized by the exceptional E₈ Lie algebra. If it weakly couples with the other quantum critical Ising chain but without the longitudinal field, then the weak inter-chain coupling can drive the system to emerge as another integrable model with eight particles, organized by the      Lie algebra. Either way, realizing the quantum criticality of the TFIC is a key step to access the two exotic integrable systems. In my talk, I will explore the quantum criticality of the TFIC and its role in identifying materials hosting TFIC quantum criticality and exotic E₈ physics.  My journey began with an inelastic neutron scattering experiment on CoNb₂O₆, sparking my exploration of E₈ physics. Despite a ten-year gap, recent THz spectroscopy on the same material reignited my interest, leading us to challenge the E₈ paradigm and propose the      picture. I will discuss why the      physics provides a comprehensive understanding for the experimental observations. Along the course, we also surprisingly found long-life-time dark particle, a special kind of many-body magnetic excitation, in the integrable system which accommodates the     physics.  

个人简介：

吴建达，副教授，李政道学者。长期致力于量子相变、量子临界热力学及动力学、可积系统动力学等相关领域的研究工作。2004年及2007年于中国科学技术大学获得学士及硕士学位、2014年博士毕业于美国莱斯大学、2014-2017年在美国加州大学圣地亚哥分校从事博士后工作、2017-2018年担任德国马普复杂系统物理所客座研究员。2018年至今就职于上海交通大学李政道研究所及物理与天文学院。迄今已在包括PRL、Nature及Nature子刊、Science Bulletin等在内的高水平学术期刊上共发表论文近四十篇。获批国家自然基金“原创探索”项目。先后受邀在重要学术会议及学术机构作学术报告八十余次。

专长：量子相变、量子临界热力学及动力学、Bethe Ansatz、量子可积场论、量子多体动力学