激光聚變、無序復雜體系、非線性超表面 、里德堡原子陣列 | 本周物理講座

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報告人：Matteo Dürrnagel, University of Wuerzburg

時間：9月16日（周二）14:30

單位：中國科學院理論物理研究所

地點：南樓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.

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

時間：9月16日（周二）16:00

單位：清華大學物理系

地點：物理樓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.

報告人簡介：

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.

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報告人：吳棟，上海交通大學

時間：9月16日（周二）20:00

單位：中國科學院理論物理研究所

騰訊會議: 790-297-829

密碼: 654321

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報告人：孫剛，北京師范大學

時間：9月17日（周三）10:00

單位：中國科學院物理研究所

地點：物理所A樓232會議室

摘要：
無序復雜體系是軟物質的重要組成部分,不僅種類繁多而且跨越多個尺度量級。無序復雜體系有兩個主要特征：結構的無序和構成單元之間相互作用的非線性，導致了無序復雜體系不僅具有優異的物理化學特性還表現出復雜的物理現象。從這些看似混亂的系統中尋找隱藏序，深入研究無序復雜系統的奇異物理化學現象，可極大拓展物理化學交叉領域的邊界。在過去一段時間內，我們在無序復雜系統的微觀結構表征方面做了一系列基礎性工作，分別從短程序、中程序和束縛序三個不同角度理解無序體系的結構和物理化學特性。其中，我們發現短程序是平衡液體與非平衡態玻璃的結構、力學和熱力學遺傳性的關鍵基因；中程序是液體選擇結晶路徑的關鍵因素；束縛序是一種描述無序體系結構的普適性表征。本次報告將分別從短程、中程和束縛序的三個方面講述淺談我們對無序復雜體系結構的理解。

報告人簡介：

孫剛，北京師范大學高等量子材料中心教授。2016年于北京大學、波士頓大學（聯合培養）獲得博士學位，先后在澳大利亞悉尼大學，日本東京大學從事博士后研究。研究興趣集中在復雜體系的相變和臨界現象，主要包括不同維度下的液體-液體相變、液體-晶體相變、液體-玻璃轉變以及玻璃-玻璃轉變等。曾獲國家自然基金海外高層次人才，北京大學創新獎，北京大學光華獎等。迄今在Nature Materials, Nature Communications, PRL, PNAS等國際學術期刊上發表學術成果三十余篇，獲得國家發明專利一項。

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報告人：Hendrik Hohmann, University of Wuerzburg

時間：9月17日（周三）14:30

單位：中國科學院理論物理研究所

地點：南樓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.

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報告人：韓家廣，天津大學

時間：9月17日（周三）15:10

單位：北京大學物理學院

地點：物理學院中212教室

摘要：

本報告旨在回顧基于超表面的太赫茲功能器件的發展歷程。首先從太赫茲線性超表面入手，闡述其如何實現對太赫茲波的基本調控，緩解太赫茲功能器件短缺的瓶頸問題；進而探討近年來在集成化方向上的進展，特別是如何通過非線性超表面實現太赫茲波的產生與調控一體化，推動高性能太赫茲系統的發展。

報告人簡介：

韓家廣，天津大學精密儀器與光電子工程學院/桂林電子科技大學光電工程學院教授，國家杰出青年基金獲得者、美國光學學會會士。主要從事太赫茲的基礎研究，在Nature Physics、Nature Communications、 Physical Review Letters等期刊發表多篇SCI論文。擔任紅外、毫米波及太赫茲波國際會議的程序委員、亞洲光電子會議紅外毫米波及太赫茲技術會議程序委員、超快現象及太赫茲波國際會議的程序委員；擔任PhotoniX、Chinese Physics B 等期刊編委。

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報告人：En-Hung Chao, Columbia University

時間：9月18日（周四）9:30

單位：北京大學物理學院

地點：物理西樓B105

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報告人：尤力，清華大學物理系

時間：9月18日（周四）14:30

單位：清華大學物理系

地點：物理樓W101報告廳

摘要：

原子內態具有無與倫比的相干性，可以編碼量子信息，可以高精度操控。它們的全同性提供了規模化優勢，是發展量子信息科技的重要選擇。本報告將簡述近五年我們在量子精密測量和量子計算方向的研究進展。繼上個聘期成功利用量子相變實現確定性制備規模化原子糾纏，抑制了99%的量子測量投影噪聲，并觀測到多個國際先進的糾纏增強測量精度指標后，我們提出并演示了利用時間反演動力學實現無噪聲量子放大，高效讀出了多原子糾纏允許的測量精度理論極限增益，觀測到可實現海森堡精度時間標度率的連續時間平移對稱性破缺的時間晶體，并首次在物質波干涉測量中演示了非對易算符的參數同時測量到超越經典精度極限。我們還承接2030任務，建成可編排無缺陷原子陣列平臺，在實驗上首次觀測到反常量子信息置亂；發展了展示量子優勢的實用算法；在一維隨機SSH鏈中通過測量單自旋分辨的空間關聯函數,首次觀測到隨機長程相互作用誘導的受系綜平均反演對稱性保護的拓撲量子相變，并在時域上觀測到拓撲邊緣態更長的壽命。

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報告人：劉尚, 中國科學院物理研究所

時間：9月18日（周四）15:10

單位：北京大學物理學院

地點：物理西樓B105

10

報告人：孫漢東, 澳門大學

時間：9月22日（下周一）10:00

單位：中國科學院物理研究所

騰訊視頻會議號：279-203-048

會議密碼：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.

報告人簡介：
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.

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

時間：9月22日（下周一）10:30

單位：北京大學物理學院

地點： 物理學院西樓B105

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