激光聚变、无序复杂体系、非线性超表面 、里德堡原子阵列 | 本周物理讲座

1

报告人：Matteo Dürrnagel, University of Wuerzburg

时间：9月16日（周二）14:30

单位：中国科学院理论物理研究所

地点：南楼6620

摘要：

Altermagnetism (AM) has attracted increasing interest via the non-relativistic spin splitting of its quasi-particle bandstructure at zero net magnetization. The symmetry allowed momentum structures of the magnetic gap are conventionally determined by the space group of the underlying crystal lattice defining the altermagnetic spin groups. We present two new avenues to extend this paradigm:

1. In an itinerant altermagnetic transition, the orbital polarization of the Fermi surface may select only a subset of electronic states to participate in the magnetic ordering. This can reduce the effective symmetry of the magnetic atoms unlocking AM states on lattices defying a classification in conventional spin groups.

2. Valley exchange symmetries acting as momentum space translations can acquire real space representation not comprised in the system's space group. This allows to design unprecedented AM states with extended s-wave symmetry, that feature nodeless spin polarized Fermi sheets ideal for spintronic applications.

2

报告人：Antoine Browaeys, Laboratoire Charles Fabry, Institut d’Optique, CNRS

时间：9月16日（周二）16:00

单位：清华大学物理系

地点：物理楼W105

摘要：
This talk will present two recent experiments where we explore quantum magnetism in a synthetic system consisting of Rydberg atoms arranged in arrays of various geometries.We explore the dynamics of hole in a spin background, implementing a bosonic version of the t-J model usually introduced to describe the properties of doped magnets. To do so, we use the resonant dipole interaction between Rydberg atoms in tweezer arrays and rely on three Rydberg states in each atom to encode the spin and the hole. Varying the ration t/J, we observe in a one dimensional chain the binding of holes and the influence of the dipolar tail of the interaction on the propagation of the holes [Qiao et al., Nature 2025]. Working in a triangular ladder geometry and in a regime where t J, we observe the binding of a magnon and hole and explore kinetic frustration in this system.

报告人简介：

Antoine Browaeys is a senior staff Scientist at CNRS. He studied at the Ecole Normale Supérieure in Cachan (France) and did his ph’D under Alain Aspect at the Institut d’Optique (2000). He spent two years at NIST in the Laser Cooling group led by W.D. Phillips. He was hired as a scientist at CNRS in 2003. He is working on experiments manipulating individual cold atoms and small, dense atomic clouds. Part of his research led to the creation of the Pasqal company, that he is a co-founder and scientific adviser of. He was awarded the Aimé Cotton Prize of the French Physical Society in 2007 and the Silver medal of CNRS in 2021. He was elected member of the French academy of science in December 2023.

3

报告人：吴栋，上海交通大学

时间：9月16日（周二）20:00

单位：中国科学院理论物理研究所

腾讯会议: 790-297-829

密码: 654321

4

报告人：孙刚，北京师范大学

时间：9月17日（周三）10:00

单位：中国科学院物理研究所

地点：物理所A楼232会议室

摘要：
无序复杂体系是软物质的重要组成部分,不仅种类繁多而且跨越多个尺度量级。无序复杂体系有两个主要特征：结构的无序和构成单元之间相互作用的非线性，导致了无序复杂体系不仅具有优异的物理化学特性还表现出复杂的物理现象。从这些看似混乱的系统中寻找隐藏序，深入研究无序复杂系统的奇异物理化学现象，可极大拓展物理化学交叉领域的边界。在过去一段时间内，我们在无序复杂系统的微观结构表征方面做了一系列基础性工作，分别从短程序、中程序和束缚序三个不同角度理解无序体系的结构和物理化学特性。其中，我们发现短程序是平衡液体与非平衡态玻璃的结构、力学和热力学遗传性的关键基因；中程序是液体选择结晶路径的关键因素；束缚序是一种描述无序体系结构的普适性表征。本次报告将分别从短程、中程和束缚序的三个方面讲述浅谈我们对无序复杂体系结构的理解。

报告人简介：

孙刚，北京师范大学高等量子材料中心教授。2016年于北京大学、波士顿大学（联合培养）获得博士学位，先后在澳大利亚悉尼大学，日本东京大学从事博士后研究。研究兴趣集中在复杂体系的相变和临界现象，主要包括不同维度下的液体-液体相变、液体-晶体相变、液体-玻璃转变以及玻璃-玻璃转变等。曾获国家自然基金海外高层次人才，北京大学创新奖，北京大学光华奖等。迄今在Nature Materials, Nature Communications, PRL, PNAS等国际学术期刊上发表学术成果三十余篇，获得国家发明专利一项。

5

报告人：Hendrik Hohmann, University of Wuerzburg

时间：9月17日（周三）14:30

单位：中国科学院理论物理研究所

地点：南楼6620

摘要：

Spatially modulated superconductivity describes a quantum state where the superconducting order parameter varies periodically in space. Traditionally associated with FFLO or PDW phases, such states imply that Cooper pairs carry finite momentum and break translational symmetry. In this talk, I will present a new perspective where the presence of a sublattice structure provides an intrinsic route to modulated superconductivity. This scenario, termed Sublattice Modulated Superconductivity, can be viewed as a scale-separated symmetry breaking: translational symmetry is broken at higher energies, followed by unconventional superconductivity modulated within the emergent sublattice pattern. I will discuss the microscopic mechanism based on finite-range pair hopping, the role of sublattice interference in amplifying such correlations, and insights from functional renormalization group calculations. Finally, I will connect these theoretical ideas to recent experimental realizations in iron-based and Kagome superconductors.

6

报告人：韩家广，天津大学

时间：9月17日（周三）15:10

单位：北京大学物理学院

地点：物理学院中212教室

摘要：

本报告旨在回顾基于超表面的太赫兹功能器件的发展历程。首先从太赫兹线性超表面入手，阐述其如何实现对太赫兹波的基本调控，缓解太赫兹功能器件短缺的瓶颈问题；进而探讨近年来在集成化方向上的进展，特别是如何通过非线性超表面实现太赫兹波的产生与调控一体化，推动高性能太赫兹系统的发展。

报告人简介：

韩家广，天津大学精密仪器与光电子工程学院/桂林电子科技大学光电工程学院教授，国家杰出青年基金获得者、美国光学学会会士。主要从事太赫兹的基础研究，在Nature Physics、Nature Communications、 Physical Review Letters等期刊发表多篇SCI论文。担任红外、毫米波及太赫兹波国际会议的程序委员、亚洲光电子会议红外毫米波及太赫兹技术会议程序委员、超快现象及太赫兹波国际会议的程序委员；担任PhotoniX、Chinese Physics B 等期刊编委。

7

报告人：En-Hung Chao, Columbia University

时间：9月18日（周四）9:30

单位：北京大学物理学院

地点：物理西楼B105

8

报告人：尤力，清华大学物理系

时间：9月18日（周四）14:30

单位：清华大学物理系

地点：物理楼W101报告厅

摘要：

原子内态具有无与伦比的相干性，可以编码量子信息，可以高精度操控。它们的全同性提供了规模化优势，是发展量子信息科技的重要选择。本报告将简述近五年我们在量子精密测量和量子计算方向的研究进展。继上个聘期成功利用量子相变实现确定性制备规模化原子纠缠，抑制了99%的量子测量投影噪声，并观测到多个国际先进的纠缠增强测量精度指标后，我们提出并演示了利用时间反演动力学实现无噪声量子放大，高效读出了多原子纠缠允许的测量精度理论极限增益，观测到可实现海森堡精度时间标度率的连续时间平移对称性破缺的时间晶体，并首次在物质波干涉测量中演示了非对易算符的参数同时测量到超越经典精度极限。我们还承接2030任务，建成可编排无缺陷原子阵列平台，在实验上首次观测到反常量子信息置乱；发展了展示量子优势的实用算法；在一维随机SSH链中通过测量单自旋分辨的空间关联函数,首次观测到随机长程相互作用诱导的受系综平均反演对称性保护的拓扑量子相变，并在时域上观测到拓扑边缘态更长的寿命。

9

报告人：刘尚, 中国科学院物理研究所

时间：9月18日（周四）15:10

单位：北京大学物理学院

地点：物理西楼B105

10

报告人：孙汉东, 澳门大学

时间：9月22日（下周一）10:00

单位：中国科学院物理研究所

腾讯视频会议号：279-203-048

会议密码：250922

摘要：

Colloidal semiconductor nanostructures have attracted tremendous attention because of their intrinsic advantages over traditional epitaxy- based semiconductor heterostructures in luminescent device applications. In particular, colloidal semiconductor quantum dot LEDs have already appeared on commercial market. As a class of Nobel prize winning materials, colloidal semiconductor nanostructures, have been regarded to be advantageous for semiconductor lasers for several decades. However, despite of remarkable progress in this field, challenges remain. In this talk, the speaker will first share the motivation and the current advances of microlasers made from colloidal semiconductor nanostructures. He will then update the latest achievements made from his team, including WGM lasers, fiber-integrated microlasers and topological lasers. The talk will end with summary and sharing opinions about future research prospective.

报告人简介：
Handong Sun is a Distinguished Professor and Associate Director (Research & Enterprise) in the Institute of Applied Physics & Materials Engineering (IAPME), University of Macau. Professor Sun received his Bachelor of Science in Physics from Dalian University of Technology, China. He obtained his Master of Science in Optics from Huazhong University of Science and Technology, China. He achieved his Doctor of Philosophy in Physics from Hong Kong University of Science and Technology, Hong Kong. Before joining University of Macau in 2023, Prof. Sun had been working as a professor in the School of Physical and Mathematical Science, Nanyang Technological University (Singapore) from 2007 to 2023. Earlier on, he did postdoctoral research works at RIKEN, Japan and Institute of Photonics, The University of Strathclyde, UK. His research theme exists at the interface between optical physics and material science, i.e. light-matter interaction. His current research works focus on Optical Spectroscopy, Optoelectronic Materials and Devices, Nonlinear Optical Materials, Micro- and Nano-Lasers etc. Prof. Sun was elected to be a Fellow of American Physical Society in 2016 and an OPTICA Fellow in 2023.

11

报告人：Prof. Liping Gan (University of North Carolina Wilmington, Wilmington, NC, USA)

时间：9月22日（下周一）10:30

单位：北京大学物理学院

地点： 物理学院西楼B105

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