物理学院学术报告（第44期）

报告题目:Topological Aspect of Floquet Thermalization

报告专家:郑炜 教授 中国科学技术大学

报告时间:2026年07月08日（周三）14:30

报告地点:理6栋302    邀请人:张善超

报告内容：

Floquet engineering is a powerful manipulation method in modern quantum technology. However, unwanted heating is the main challenge of Floquet engineering, therefore the Floquet thermalization has attracting considerable attentions recently. In this work, we investigate thermalization of periodically driven many-body systems through the lens of Krylov complexity, and find a topological origin of different thermalization behaviors. We demonstrate that if the topology of the Krylov chain is nontrivial, a periodically driven system will reach a state with finite temperature. When the Krylov chain is topologically trivial, the system will be heated to infinite temperature. We further show that the prethermalization can be understood as the tunnelling process of a quasi-edge mode through the local gap on Krylov chain. This picture provides a systematically method to obtain the effective prethermal Hamiltonian.

专家简介：

郑炜，中国科学技术大学物理学院特任教授。2012年于中山大学获得博士学位。2012年至2019年先后在清华大学、剑桥大学、以及香港大学从事博士后研究工作。2020年加入中国科学技术大学至今。主要研究方向为量子多体系统的非平衡动力学，以及超冷原子物理等。在Physical Review Letters、Science Bulletin等学术期刊上发表论文40余篇。