宏观量子叠加、超快太赫兹、大气模式 、轻子生成机制 | 本周物理讲座

1

报告人： 孙昌璞，中国工程物理研究院研究生院

时间：10月21日（周二）15:00

单位：中国科学院理论物理研究所

地点：南楼6620

2

报告人：Zhenghao Zhong，SIMIS

时间：10月21日（周二）10:30

单位：北京大学物理学院

地点：物理西楼B105

3

报告人：Hjalte Frellesvig，Zhejiang University

时间：10月22日（周三）10:30

单位：北京大学物理学院

地点：物理西楼B105

4

报告人： Zhe Wang，Department of Physics, TU Dortmund University

时间：10月22日（周三）15:00

单位：中国科学院物理研究所

地点：M楼253会议室

摘要：

In the talk I will present an overview of our recent experimental studies of nonlinear terahertz dynamics in several representative classes of solid-state materials, including Dirac semimetal, semiconductor, and strongly correlated metal. By using time-resolved ultrafast terahertz high-harmonic generation spectroscopy, we are able to reveal characteristic nonequilibrium nonlinear dynamics of Dirac/Weyl fermions, may-body excitonic states and quantum critical metal at the terahertz frequencies. I will show that the ultrafast terahertz high-harmonic generation spectroscopy is very powerful for the investigation of the complex dynamic behaviors of Dirac/Weyl fermions, many-body excitons, or strongly correlated electrons, and present our understanding of the physics responsible for the very intriguing nonlinear phenomena.

报告人简介：

Professor Zhe Wang studied physics in Nanjing University, and obtained his master and PhD degrees from the University of Augsburg in Germany. Before he joined TU Dortmund University as a full professor in 2020, he was a junior group leader at the University of Cologne from 2019 to 2020 and a postdoctoral fellow in the Helmholtz-Center Dresden-Rossendorf from 2017 to 2019. His recent research focuses on terahertz dynamics of quantum materials, particularly in quantum magnets, Dirac matter and superconductors.

5

报告人：李艺苑，中国科学院大气物理研究所

时间：10月22日（周三）15:00

单位：北京大学物理学院

地点：物理大楼北547教室

腾讯会议：655-163-709

摘要：

无论在地球还是火星，大气模式都是数值天气预报与气候预测最核心的工具之一。本报告将介绍大气模式的构建原理与方法，重点阐述模式系统的关键组成，包括:数值方案、计算网格、坐标系等的设计思路与主要特征。在火星部分，报告将在简要概述火星大气基本特征的基础上，以中国新一代火星大气模式GoMars的研发为例，介绍模式构建思路与评估方法。希望本报告能帮助模式用户更深入理解模式行为，也期待更多对建模感兴趣的同行加入模式研发。

报告人简介：

李艺苑博士毕业于中国科学院大学，地球流体力学专业，现任中国科学院大气物理研究所副研究员。自幼热爱科学，博士求学至今，一直从事大气模式基础问题研究，特别关注新型垂直坐标的设计。2014-2016、2018-2022年参与中国科学院大学研究生核心课程“计算地球流体力学”授课。近年来，围绕火星大气模式研发开展工作，合作发展了中国新一代火星大气模式GoMars，相关工作被选为《科学通报》（2024年第10期）和《Advances in Atmospheric Sciences》（2025年预出版）的封面文章发表。

6

报告人：何杨辉，Yang-Hui He

时间：10月22日（周三）15:00

单位：北京大学物理学院

地点：物理西楼3层思源报告厅

7

报告人： 杨帆，北京理工大学

时间：10月23日（周四）10:00

单位：中国科学院理论物理研究所

地点：南楼6620

8

报告人：熊汗青，北京大学

时间：10月23日（周四）14:00

单位：中国科学院物理研究所

地点：M楼253会议室

摘要：

Stimulated Raman scattering (SRS) has emerged as a powerful quantitative contrast mechanism for chemical imaging in recent years. Conventional SRS techniques, which operate in the frequency domain, face a fundamental trade-off between excitation efficiency and spectral resolution: while the nonlinear process benefits from ultrafast pulsed excitations, the time-energy uncertainty principle intrinsically limits spectral resolution. Additionally, spectral range and acquisition speed are mutually constrained. In this talk, I will present a novel time-domain excitation strategy developed in our lab that circumvents these limitations. By encoding Raman free-induction decays into time-domain stimulated Raman loss (SRL) signals through vibrational wave packet interference, we reconstruct the Raman spectrum via Fourier transform of the time-domain SRL signal. This approach achieves natural-linewidth-limit spectral line shapes, a spectral range determined by the laser bandwidth, and enhanced sensitivity. I will discuss our progress in obtaining self-calibrated standard Raman spectra and high-speed super-broadband Raman imaging, along with the advantages and limitations of this method for biomedical imaging applications.

报告人简介：

Prof. Hanqing Xiong is now an assistant professor of the National Biomedical Imaging Center at Peking University (selected for the National Youth Talent Program of China). He received his Bachelor's degree from the Department of Biomedical Engineering at Huazhong University of Science and Technology in 2012, followed by his Master's training at the Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology in 2015. He then pursued his doctoral studies at Columbia University, where he trained as a spectroscopic physicist and earned his Ph.D. from the Department of Chemistry in 2020. He joined Peking University as a PI in Mar. 2021. His research focuses on ultrafast molecular vibrational spectroscopy and its applications in biomedical detection and imaging. He has published systematic research innovations in the fields of (i) coherent Raman spectroscopy & imaging and (ii) mesoscale connectomics, and holds or has applied for several related invention patents.3.

9

报告人：万义顿，复旦大学物理系

时间：10月24日（周五）9:30

单位：中国科学院物理研究所

地点：M楼837

摘要：

In this talk, we shall introduce a CFT factory -- a novel algorithm of methodically generating 2D lattice models that would flow to conformal field theories (CFTs) in the infrared. We realise these models by engineering the boundary conditions of 3D topological orders (SymTOs) described by string-net models. The critical points are induced by a commensurate condensation of non-commuting anyons. Our structured method generates an infinite family of critical lattice models, including the A-series minimal models, and uncovers previously unknown critical points. Notably, we discover at least three novel CFTs (with central charge c around 1.3, 1.8, and 2.5) that preserves the Haagerup symmetries, in addition to recovering previously reported examples. The non-invertible symmetries preserved at these points are dictated by a novel "refined condensation tree". The condensation trees predict large swathes of phase boundaries and sieves out second order phase transitions. This predictive power is illustrated not only in well-studied examples, such as the 8-vertex model associated with the A5 category, but also in new cases involving Haagerup symmetries, validated by an improved symmetry-preserving tensor-network renormalization group method. The critical couplings are precisely encoded in algebraic data (the Frobenius algebras and quantum dimensions of unitary fusion categories), thereby establishing a powerful and systematic route to the discovery and potential classification of new CFTs.

报告人简介：

Yidun Wan is a tenured professor of physics at Fudan University. He has a diverse educational background, with bachelor degrees in computer science and economics from South China University of Technology (1998), master of computer science from University of Pennsylvania (2002), master of physics from University of Ottawa (2004), and PhD in theoretical physics from University of Waterloo and Perimeter Institute for Theoretical Physics (2009). He also did postdoctoral research at Kinki University, Tokyo University, and Perimeter Institute for Theoretical Physics from 2009 to 2016. He joined Fudan as a professor in 2016. His research interests include cosmology, topological orders, quantum information and computation, and their interdisciplinary studies.

10

报告人：赵振华，辽宁师范大学

时间：10月24日（周五）10:30

单位：中国科学院理论物理研究所

地点：南楼6520

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