报告题目：Dynamical Probe of Quantum Criticality

报告人：翟荟 教授（清华大学高等研究院）

报告时间：2025年3月19日（周三）下午2:30

报告地点：光电所二层报告厅

报告摘要：  

Quantum systems exhibit universal scaling behavior when approaching or residing at the critical point of a phase transition. Conventional studies of such critical behaviors typically rely on measuring static properties, such as susceptibility, using linear response theory. Here, we discuss two theoretical protocols for measuring universal scaling through dynamical processes and their experimental realization in ultracold atom systems. The first extends the Kibble-Zurek scaling to a near-critical regime, enabling precise probing of the critical exponent as one approaches a critical point via ramping dynamics. The second extends the linear response to the non-Hermitian case, allowing the probing of the critical exponent at a critical point through dissipation dynamics. These results showcase that cold atom physics can reveal a different perspective of quantum many-body physics.

报告人简介：

翟荟，清华大学高等研究院教授。2002年本科毕业清华大学物理系首届基础科学班，2005年初在清华大学高等研究院获得博士学位后，先后在美国俄亥俄州立大学和加州大学伯克利分校从事博士后研究。2009年起回清华大学高等研究院工作至今。主要从事冷原子、凝聚态等量子物质的理论研究，十多项理论预言被国内外实验组证实。已发表论文百余篇，其中在Science、Nat. Phys.、PRX、PRL等期刊发表论文50余篇，论文引用8000余次。所著教材《Ultracold Atomic Physics》在剑桥大学出版社出版。国家高层次人才，荣获中国物理学会饶毓泰奖、科学探索奖、北京市杰出青年中关村奖、美国物理学会会士等荣誉。