报告题目：Topological Aspect of Floquet Thermalization

报  告 人：郑炜 教授（海外优青），中国科学技术大学

研究方向：基于超冷原子平台的量子多体理论

报告时间：2025年3月14日（星期五）上午10：00

报告地点：量子楼410报告厅

报告摘要：

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.

报告人简介：

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。2021年获得基金委海外优青项目支持。主要研究方向为基于超冷原子平台的量子多体理论。在Nature Physics、Physical Review Letters、Science Bulletin等学术期刊上发表论文30余篇。