Exotic emergences in low-dimensional quantum Ising models: From E_8 to D_8^((1)) particles

讲演择要：
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 D_8^((1)) 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 D_8^((1)) picture. I will discuss why the D_8^((1)) 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 acco妹妹odates the D_8^((1)) physics.

讲演人简介：
吴建达，李政道学者。恒久致力于量子相变、量子临界热力学及能源学、贝特拟设及可积体系能源学等相干范畴的研究事情。2004年及2007年于中国迷信技能年夜学得到学士及硕士学位、2014年博士结业于美国莱斯年夜学、2014-2017年正在美国加州年夜学圣地亚哥分校从事博士后事情、2017-2018年担当德国马普庞大体系物理所客座研究员。2018年至今就任于上海交通年夜学李政道研究所及物理与天文学院。迄今已正在包含PRL、Nature及Nature子刊等正在内的高程度学术期刊上共颁发论文三十余篇。前后正在国际及海内重要学术集会、海内内科研机构及学术单元给约请学术讲演六十余次。