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报告人：Prof. Nigel Hussey，University of Bristol, UK and Radboud University, Netherlands
时间：5月6日（周二）10:00
单位：中国科学院物理研究所
地点：M楼236会议室
摘要：
In conventional superconductors, one of the key parameters fixing the robustness of the superconductivity is the electron–phonon coupling strength λ. This in turn is closely related to λtr, the parameter that defines the transport scattering rate associated with the linear-in-temperature resistivity that is characteristic of a normal metal. This link between the coefficient of the T-linear resistivity α and the superconducting transition temperature Tc is enshrined in the old adage; ‘‘good metals make bad superconductors”. In certain unconventional superconductors, including the high-Tc cuprates, a similar correlation exists, albeit with a T-linear resistivity that extends to anomalously low temperatures indicative of a unconventional or ‘strange’ metal. Despite this complication, the search for an associated λ has been prolonged and intense. In this talk, I will present a series of electrical transport studies of both electron- and hole-doped cuprates, carried out under intense magnetic fields, that reveal two key findings about the strange metal and its link with superconductivity. On the electron-doped side, we have succeeded to identify the relevant λ as well as its origin. On the hole-doped side, however, their magneto-transport properties suggest an altogether different origin for the T-linear resistivity (i.e. one that is not related to scattering off a bosonic bath) and, in turn, an entirely new paradigm for high-Tc superconductivity.
报告人简介：
Nigel Hussey has been full professor since 2006, initially at the University of Bristol then from 2013 at Radboud University. From 2013 until 2018, he also served as director of the High Field Magnet Laboratory. His research focuses on precision measurements of the transport properties of exotic, low-dimensional metals and superconductors in high magnetic fields. He is credited with the first experimental determination of the full Fermi surface of a high temperature superconductor, and the discovery of the strange metallic state. In recognition of these discoveries, he has been a recipient of the Charles Vernon Boys medal (now the Henry Moseley medal) from the Institute of Physics, the inaugural Brian Pippard superconductivity prize and a Royal Society Wolfson Research Merit award. He is also an elected Fellow of the Institute of Physics. In 2019, Hussey received an ERC Advanced grant.
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报告人：白正阳，南京大学物理学院
时间：5月6日（周二）12:00
单位：江苏省物理学会
链接：
摘要：
高激发态里德堡原子之间存在很强的长程相互作用，为研究量子非线性光学、非平衡统计物理以及多体量子模拟提供了一个良好的平台。与单体系统不同，通过光学激发方案，里德堡原子可实现长程量子关联。报告内容主要包括：1、利用原子相互作用实现有效光子之间的相互作用，产生的高度局域化的时空光子弹；2. 介绍室温里德堡气体中纳秒激光脉冲稳定传输方案，并揭示强相互作用情况下的自感应透明特征; 3.介绍里德堡系统中的一些有趣的非平衡机制，包括遍历性破缺动力学及其相关的连续时间晶体相。
报告人简介：
白正阳，南京大学物理学院助理教授。博士毕业于华东师范大学精密光谱科学与技术国家重点实验室，2018-2020年在英国诺丁汉大学开展博士后研究，2020-2024年任职华东师范大学，2025年-至今任职南京大学。目前的研究兴趣主要围绕光与原子相互作用产生的若干非线性与非平衡物理问题，具体研究方向包括：光学孤子的形成与传输、多体系统中非平衡动力学相变、量子信息与量子测量等。目前，已在包括Physical Review Letters, Science Advances, Optica, Applied Physics Reviews等学术刊物发表文章30余篇，部分理论预言被国内外实验组证实。先后获得上海市自然科学二等奖（第二完成人）、上海市浦江人才等项目资助。
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报告人：周贝，Kavli Institute for Cosmological Physics at the University of Chicago
时间：5月6日（周二）14:30
单位：中国科学技术大学天文学系
链接：
摘要：
High-energy neutrinos (>~ 100 GeV) are crucial for both astrophysics and particle physics. For example, they provide a unique tool to study the origin of HE cosmic rays and studying extreme astrophysical environments. They also offer great opportunities to study neutrino interactions and test physics in the Standard Model and beyond, as neutrinos guarantee new physics. In this talk, I will present examples of the above aspects and will also present what is needed for the precision high energy neutrino astrophysics enabled by the upcoming telescopes.
报告人简介：
Dr. Bei Zhou is currently a Postdoc in Kavli Institute for Cosmological Physics at the University of Chicago. Prior to this, he was a Postdoc (2020-2023) in the Department of Physics and Astronomy at Johns Hopkins University, collaborating with Prof. Marc Kamionkowski. He earned the Ph.D. (with Prof. John Beacom) from the Department of Physics at The Ohio State University (2015–2020), affiliating with the Center for Cosmology and AstroParticle Physics (CCAPP). Dr. Bei Zhou’s primary focus is on theoretical particle astrophysics and cosmology, with particular interests in neutrinos, gamma rays, and dark matter.
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报告人：Prof. Mladen Horvatić，Laboratoire National des Champs Magnétiques Intenses, CNRS
时间：5月8日（周四）10:00
单位：中国科学院物理研究所
地点：怀柔园区X1楼101会议室
摘要：
Mott-insulator materials, described by spin Hamiltonians that are dominated by the Heisenberg antiferromagnetic (AF) exchange interactions are valuable model system of quantum magnetism. In magnetic field, most of them present a low-temperature AF-ordered gapless phase, which can be described in terms of the Bose-Einstein condensation (BEC). At temperatures (T) above that phase, when the dominant dimensionality (D) of the exchange interactions are quasi-1D or quasi-2D, such systems will be characterized by the critical 1D or 2D spin fluctuations. The magnetic field values that delimit the BEC phase are Quantum Critical Points, characterized by the quantum critical fluctuations. All these fluctuations precisely characterize the system and, for their low-energy limit, can be directly measured by the NMR nuclear spin-lattice relaxation rate T1-1. In this seminar I will present how the T1-1(T) data reveal the dimensionality of a spin compound, how they are analyzed for the quasi-1D and quasi-2D compounds to reveal their characteristics, and what can we learn from the quantum critical data.
报告人简介：
Mladen Horvatic is the leader of the high-field NMR group at the Laboratoire National des Champs Magnétiques Intenses (LNCMI), which is a part of the Centre National de la Recherche Scientifique (CNRS) in Grenoble, France. He has made remarkable contributions to the domains of NMR, strongly correlated systems, quantum magnetism, Bose-Einstein condensates, and physics under extreme conditions. With more than 174 publications, an h-index of 43, and approximately 6000 citations, Prof. Horvatic is a highly esteemed figure in his field. His remarkable accomplishments encompass providing the microscopic validation for the commensurate magnetic superstructure within a magnetization plateau of the renowned archetypal “Shastry-Sutherland” spin system, as well as the first microscopic indication of the FFLO phase in organic superconductors, and the discovery of a disorder-induced Bose-Einstein Condensate in a quantum spin material.
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报告人：余林蔚，南京大学
时间：5月8日（周四）15:00
单位：北京大学物理学院
地点：物理大楼中212报告厅
摘要：
在微纳尺度上，实现超精细晶体生长的极致可控能力，对突破传统制备工艺极限、探索新型超材料结构及构建三维集成新架构具有重要意义。例如，准一维超细晶硅纳米线是实现极致场效应栅控的理想半导体沟道，在新一代围栅晶体管（GAA-FET）、高性能显示驱动逻辑和高灵敏度场效应传感器等领域应用广泛。除了依赖传统昂贵的高精度光刻-刻蚀技术，基于“加法”策略的纳米液滴诱导生长可以不依赖于晶圆衬底，直接批量制备直径精细的单晶纳米线。然而，传统气-液-固（VLS）机理通常仅能生成随机朝向的竖直纳米线，难以实现平面衬底上的精准定位与集成。为此，我们提出了一种面内固-液-固（IPSLS）生长模式：利用非晶薄膜作为前驱体层，将纳米线生长完全限制在平面或曲面上。结合引导生长技术，可在低温（<350°C）下高效批量制备单晶品质、超细（CD<10 nm）晶硅纳米线沟道阵列，并实现高密度三维水平堆叠。这一技术为突破光刻局限、制备高性能GAA-FET器件、探索三维一体化集成以及柔性显示等新应用提供了全新路径。此外，IPSLS模式的独特形貌定制能力支持多样化的可编程线性设计（line-shape design），为开发高性能可拉伸晶硅柔性电子、生物传感、微纳仿生机械/逻辑和类脑计算等应用提供了创新平台。本次报告还将共同探讨IPSLS纳米液滴生长过程中的丰富动态、输运结晶机制、关键调控策略及未来技术挑战与发展方向。
报告人简介：
余林蔚教授，南京大学电子科学与工程学院教授/博导，获国家杰出青年基金、国家海外高层次人才青年计划和江苏省杰出青年基金等人才项目资助。担任法国国家科学研究院终身职位研究员（CNRS-CR2），英国物理协会IOP《Nanotechnology》编委，国际非晶/纳米晶薄膜半导体会议（ICANS）国际常驻顾问委员会委员。在硅基纳米线生长制备和器件集成应用等领域的系列工作，以第一或通讯作者在Phys. Rev. Lett.、Nature Commun.、Advanced Materials等一流学术期刊上发表论文120余篇。获国际PCT发明授权专利3项和国内授权发明专利40项。主持承担自然科学基金“后摩尔时代重大研发计划”等多项重点/面上项目、国家科技重大专项（课题）、江苏省科技支撑和“双创个人及团队”专项等，与华为终端、海思以及京东方等企业围绕相关科研成果启动多项重大“产学研”成果转化。2022年以第1完成人获教育部高等学校科学研究优秀成果“自然科学”二等奖。
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报告人：Xuelei Chen，中国科学院国家天文台
时间：5月8日（周四）15:30
单位：北京大学物理学院
地点：KIAA-auditorium
摘要：
In the decameter and hectometer wave bands (hereafter referred to as the ultra-long wavelength bands), ground-based observations face significant challenges due to the reflection, absorption and refraction of the ionosphere, and abundant radio frequency interference, leaving this spectral range largely unexplored to date. In this talk, I will introduce the Discovering the Sky at the Longest wavelength project (DSL), also known by its Chinese nameHongmeng (meaning the Primordial Universe). This is a cislunar orbit ultralong wavelength observatory, made up by a mother satellite, and 9 daughter satellites deployed by a single rocket launch. Operating in the radio-quiet zone on the far side of the Moon that naturally shields terrestrial interference, this satellite constellation will conduct pioneering interferometric imaging and global spectrum surveys. This ambitious mission aims to acquire the first substantial dataset of high-resolution, high-precision ultra-long wavelength observations in human history. This presentation will review the development of ultra-long wavelength astronomy, outline the Hongmeng Project's configuration, and discuss its scientific prospects in key areas including the Cosmic Dark Ages and Cosmic Dawn the Epoch, quasars and radio galaxies, Galactic structure and interstellar medium, as well as solar and planetary studies. Colleagues and students across relevant disciplines are warmly invited to join the Hongmeng science team and contribute to groundbreaking research in ultra-long wavelength radio astronomy.
报告人简介：
Xuelei Chen received his Ph.D. from Columbia University in 1999. He did postdoctoral research in the Ohio State University and the KITP of UC Santa Barbara before joining the faculty of the National Astronomy Observatories, Chinese Academy of Science (NAOC). He is the Director of the Division of Extragalactic Astronomy and Cosmology, and PI of the Cosmic Dark Matter and Dark Energy Research Group in NAOC. He is the leader of the Tianlai 21cm intensity mapping project, and the Hongmeng project. He has co-authored more than 230 research papers.
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报告人：吴镝，南京大学物理学院
时间：5月8日（周四）16:00
单位：清华大学物理系
地点：物理楼W101报告厅
摘要：
Ultrafast spin current is an essential ingredient for high-speed spintronic devices. It is anticipated that antiferromagnets can play to their strength of ultrafast spin dynamics on the picosecond timescale to produce and manipulate picosecond spin currents. In this talk, I will introduce our understanding on the optical generation of picosecond spin current in metal/antiferromagnetic heterostructures at zero magnetic field and room temperature. The spin current originates from a magnetic-dipole nonlinear optical process due to the broken mirror symmetry. We propose a model based on the symmetry to quantitatively explain the experimental observations. Owing to the ultrashort time scale, the manipulation of the ultrafast spin current is different. We find that the direction of the spin polarization of the ultrafast spin current can be strongly modulated after the reflection from an antiferromagnet.
报告人简介：
吴镝，南京大学物理学院教授。分别于1997年和2001年获得复旦大学物理学系理学学士学位和凝聚态物理专业博士学位。研究生期间曾到香港科技大学和德国Max-Plank微结构物理研究所短期访问。博士毕业后分别在美国犹他大学和加州大学河滨分校物理系作博士后。2007年到南京大学工作。主要研究方向为自旋电子学。2012年及2020年分别获得国家级人才基金。
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报告人：Bum-Hoon Lee，Sogang University
时间：5月9日（周五）10:00
单位：中国科学院理论物理研究所
地点：北楼322
Zoom Meeting ID: 870 9584 6799
Passcode: 748111
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报告人：吴孝松，北京大学物理学院
时间：5月9日（周五）10:30
单位：南方科技大学物理系
地点
摘要：
The discovery of topological materials highlights the importance of the quantum geometry of Bloch wavefunctions in material properties. The most celebrated example is the Berry phase and Berry curvature, which are known to underlie the anomalous Hall effect, the spin Hall effect and topological states to name a few. Recently, another quantum geometric property, the quantum metric, has attracted significant attentions. Theoretical studies have suggested that a number of phenomena, such as the nonlinear Hall effect, flat band superconductivity and bulk photovoltaic effect, are closely related to the quantum metric. In this talk, I will focus on two types of nonlinear Hall effects: the magnetononlinear and third-order electric nonlinear anomalous Hall effects. They stem from the response of the Berry curvature to electromagnetic fields, in which the quantum metric plays a profound role. I will show experimental observation for these effects in a kagome material of Fe3Sn2 and a heterodimensional superlattice material of V5S8. In addition, I point out issues that have bee largely overlooked in the studies of the nonlinear Hall effect and demonstrate a facile method for proper measurements of electric nonlinear transport coefficients. These studies deepen our understanding of the quantum geometry, which provides a geometric point of view on electronic properties of condensed matter.
报告人简介：
吴孝松，北京大学物理学院凝聚态物理与材料物理研究所教授。1998年本科毕业于南开大学，2003年在中国科学院物理研究所获博士学位，之后在美国路易斯安那州立大学和佐治亚理工大学进行博士后研究，2009年入职北京大学物理学院。2012年获基金委“优青”资助。长期从事低维电子体系在低温强磁场下的电输运和热电输运行为的实验研究，并探索对这些行为进行量子调控的手段。目前的研究主要关注拓扑材料、二维磁性材料，以及二维超导材料中的新奇量子输运性质。在Nature、Science、PRL、Nature Commun.、PNAS等杂志发表论文90余篇。
封面图片来源：https://www.sohu.com/a/875113261_121010025
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