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A tale from the transverse-field Ising chain to quantum E8 integrable model

2020-11-18

讲座题目:A tale from the transverse-field Ising chain to quantum E8 integrable model

报  告  人:吴建达 教授 上海交通大学 李政道研究所

时       间:11月18号(星期三)16:00

点:理工楼801会议室

内容摘要:

Exotic thermodynamics and excitations can emerge in the vicinity of a quantum phase transition. In the talk, I will first detailedly discuss the very unique quantum criticality for the Grüneisen ratio in the transverse field Ising chain (TFIC). The unique quantum criticality of the Grüneisen ratio then serves as a smoking gun to identify the underlying TFIC universality observed in quasi-1D antiferromagnetic materials BaCo2V2O8 and SrCo2V2O8, which clearly establishes the realization of the TFIC universality for the first time. Furthermore, when the quantum critical point of the TFIC is perturbed by a longitudinal magnetic field, it was predicted that its massive excitations are precisely described by the exceptional E8 Lie algebra. Here we show an unambiguous experimental realization of the massive E8 phase in the material BaCo2V2O8, via nuclear magnetic resonance and inelastic neutron scattering measurements, and detailed theoretical analysis. The large separation between the masked 1D and 3D quantum critical points of the system allows us to identify, for the first time, the full 8 single-particle E8 excitations as well as various multi-particle states in the spin excitation spectrum. Our results open new experimental route for exploring the dynamics of quantum integrable systems and physics beyond integrability, and thus bridge key physics in condensed matter and statistical field theory.

报告人简介:

吴建达教授,在中国科学技术大学取得学士和硕士学位,在莱斯大学取得博士学位;随后在圣地亚哥加州大学物理系从事博士后工作;任麦克斯普朗克物理复合系统研究所客座科学家;从2018年至今以李政道学者荣誉加入上海交通大学李政道研究所,同时担任物理与天文澳门赌博平台长聘教轨副教授。目前的研究兴趣包括:量子相变、量子临界动力学和热力学、可积系统中的Bethe ansatz和动力学、多体系统中的纠缠和拓扑等物理问题。