腾讯会议：860-294-881（会议密码0918）

主持人：胡海平 副研究员

联系人：柯  芬 (82649929  kefen@iphy.ac.cn)

报告摘要

The Dicke model is a paradigmatic platform for collective light–matter interactions, superradiant phase transitions, and nonequilibrium quantum criticality. At mesoscopic scales, however, all-to-all interactions produce substantial finite-size corrections, while photon loss drives a crossover between coherent and dissipative universality classes, making critical exponents difficult to extract reliably.

In this talk, I will present a unified mesoscopic scaling framework for closed and open Dicke models. Using a large-N analysis, we identify the two critical fixed points and consistently incorporate finite-size corrections into static, spectral, and ramping dynamics. This enables the independent extraction of static, dynamical, and ramp exponents, followed by a verification of the Kibble–Zurek scaling relation for both coherent and dissipative universality classes. I will also discuss how system size, photon loss, and ramp speed jointly control the coherent–dissipative crossover.

参考：Haowei Li and Hanteng Wang, "Kibble-Zurek Scaling in the Dicke Model at Mesoscopic Scales", arXiv:2608.20067

报告人简介

李浩伟博士于2020年获得中国科学技术大学物理学学士学位，2025年获得中国科学技术大学物理学博士学位，导师为易为教授，在读期间获得博士研究生国家奖学金与中国科学院院长优秀奖。2025年7月至今在清华大学高等研究院从事博士后研究，合作导师为翟荟教授，受博士后创新人才支持计划与清华大学水木学者项目资助。近五年来以第一作者或共同第一作者身份在Physical Review Letters、Physical Review Research、Physical Review B等国际知名期刊发表相关论文8篇，主要研究方向包括开放量子系统与非平衡动力学。2025年至今，主持国家自然科学基金理论物理专项博士后项目。

代表性论文：

[1] Haowei Li, Zhiyuan Yao, and Xingze Qiu, "Quantum Annealing Algorithms for Estimating Ising Partition Functions," Phys. Rev. Lett. 136, 100601 (2026).
[2] Haowei Li and Wei Yi, "Symmetry-Induced Fragmentation and Dissipative Time Crystal," Phys. Rev. B 113, 014316 (2026).
[3] Haowei Li*, Konghao Sun*, and Wei Yi, "Collective Quantum Stochastic Resonance in Rydberg Atoms," Phys. Rev. Research 6, L042046 (2024).

欢迎感兴趣的博士后进行相互交流，欢迎各位老师和同学们参加！