吴建达 副教授学术报告
Title: Loschmidt echo and quantum geometry potential in a periodical-field driven quantum Ising chain
Speaker: Jianda Wu (吴建达)
Affiliation: Shanghai Jiao Tong Universtiy（上海交通大学）
Time: 14:00-15:00, Thursday, 15th August, 2024 (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
We investigate the Loschmidt echo and quantum geometry potential (QGP) in an Ising chain subjected to a slowly rotating transverse field and a small longitudinal field. The amplitude of the rotating field is fixed to match the quantum critical point of the transverse-field Ising chain. With the presence of the small perturbation longitudinal field, at every instantaneous moment, the system's physics can be organized according to the quantum E8 integrable field theory. Surprisingly, we find that despite the system's inherently many-body nature, the QGP can be simply connected to a scattering channel involving only two E8 particles. Furthermore, we demonstrate that the QGP can induce profound dynamical transitions, manifesting as shifts in the spectral distribution of the Loschmidt echo upon tuning the field. Our work reveals the telltale quantum geometry features of a non-equilibrium quantum Ising chain, potentially inspiring future studies on the quantum geometry in non-equilibrium quantum many-body systems.
Speaker
吴建达，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、贝特拟设及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子刊等在内的高水平学术期刊上共发表论文三十余篇。先后在国际及国内重要学术会议、科研机构及学术单位给邀请学术报告六十余次。