1

報告人：Prof. Nigel Hussey，University of Bristol, UK and Radboud University, Netherlands

時間：5月6日（周二）10:00

單位：中國科學院物理研究所

地點：M樓236會議室

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.

報告人簡介：

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.

2

報告人：白正陽，南京大學物理學院

時間：5月6日（周二）12:00

單位：江蘇省物理學會

鏈接：

摘要：

高激發態里德堡原子之間存在很強的長程相互作用，為研究量子非線性光學、非平衡統計物理以及多體量子模擬提供了一個良好的平臺。與單體系統不同，通過光學激發方案，里德堡原子可實現長程量子關聯。報告內容主要包括：1、利用原子相互作用實現有效光子之間的相互作用，產生的高度局域化的時空光子彈；2. 介紹室溫里德堡氣體中納秒激光脈沖穩定傳輸方案，并揭示強相互作用情況下的自感應透明特征; 3.介紹里德堡系統中的一些有趣的非平衡機制，包括遍歷性破缺動力學及其相關的連續時間晶體相。

報告人簡介：

白正陽，南京大學物理學院助理教授。博士畢業于華東師范大學精密光譜科學與技術國家重點實驗室，2018-2020年在英國諾丁漢大學開展博士后研究，2020-2024年任職華東師范大學，2025年-至今任職南京大學。目前的研究興趣主要圍繞光與原子相互作用產生的若干非線性與非平衡物理問題，具體研究方向包括：光學孤子的形成與傳輸、多體系統中非平衡動力學相變、量子信息與量子測量等。目前，已在包括Physical Review Letters, Science Advances, Optica, Applied Physics Reviews等學術刊物發表文章30余篇，部分理論預言被國內外實驗組證實。先后獲得上海市自然科學二等獎（第二完成人）、上海市浦江人才等項目資助。

3

報告人：周貝，Kavli Institute for Cosmological Physics at the University of Chicago

時間：5月6日（周二）14:30

單位：中國科學技術大學天文學系

鏈接：

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.

報告人簡介：

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.

4

報告人：Prof. Mladen Horvati?，Laboratoire National des Champs Magnétiques Intenses, CNRS

時間：5月8日（周四）10:00

單位：中國科學院物理研究所

地點：懷柔園區X1樓101會議室

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.

報告人簡介：

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.

5

報告人：余林蔚，南京大學

時間：5月8日（周四）15:00

單位：北京大學物理學院

地點：物理大樓中212報告廳

摘要：

在微納尺度上，實現超精細晶體生長的極致可控能力，對突破傳統制備工藝極限、探索新型超材料結構及構建三維集成新架構具有重要意義。例如，準一維超細晶硅納米線是實現極致場效應柵控的理想半導體溝道，在新一代圍柵晶體管（GAA-FET）、高性能顯示驅動邏輯和高靈敏度場效應傳感器等領域應用廣泛。除了依賴傳統昂貴的高精度光刻-刻蝕技術，基于“加法”策略的納米液滴誘導生長可以不依賴于晶圓襯底，直接批量制備直徑精細的單晶納米線。然而，傳統氣-液-固（VLS）機理通常僅能生成隨機朝向的豎直納米線，難以實現平面襯底上的精準定位與集成。為此，我們提出了一種面內固-液-固（IPSLS）生長模式：利用非晶薄膜作為前驅體層，將納米線生長完全限制在平面或曲面上。結合引導生長技術，可在低溫（<350°C）下高效批量制備單晶品質、超細（CD<10 nm）晶硅納米線溝道陣列，并實現高密度三維水平堆疊。這一技術為突破光刻局限、制備高性能GAA-FET器件、探索三維一體化集成以及柔性顯示等新應用提供了全新路徑。此外，IPSLS模式的獨特形貌定制能力支持多樣化的可編程線性設計（line-shape design），為開發高性能可拉伸晶硅柔性電子、生物傳感、微納仿生機械/邏輯和類腦計算等應用提供了創新平臺。本次報告還將共同探討IPSLS納米液滴生長過程中的豐富動態、輸運結晶機制、關鍵調控策略及未來技術挑戰與發展方向。

報告人簡介：

余林蔚教授，南京大學電子科學與工程學院教授/博導，獲國家杰出青年基金、國家海外高層次人才青年計劃和江蘇省杰出青年基金等人才項目資助。擔任法國國家科學研究院終身職位研究員（CNRS-CR2），英國物理協會IOP《Nanotechnology》編委，國際非晶/納米晶薄膜半導體會議（ICANS）國際常駐顧問委員會委員。在硅基納米線生長制備和器件集成應用等領域的系列工作，以第一或通訊作者在Phys. Rev. Lett.、Nature Commun.、Advanced Materials等一流學術期刊上發表論文120余篇。獲國際PCT發明授權專利3項和國內授權發明專利40項。主持承擔自然科學基金“后摩爾時代重大研發計劃”等多項重點/面上項目、國家科技重大專項（課題）、江蘇省科技支撐和“雙創個人及團隊”專項等，與華為終端、海思以及京東方等企業圍繞相關科研成果啟動多項重大“產學研”成果轉化。2022年以第1完成人獲教育部高等學校科學研究優秀成果“自然科學”二等獎。

6

報告人：Xuelei Chen，中國科學院國家天文臺

時間：5月8日（周四）15:30

單位：北京大學物理學院

地點：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.

報告人簡介：

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.

7

報告人：吳鏑，南京大學物理學院

時間：5月8日（周四）16:00

單位：清華大學物理系

地點：物理樓W101報告廳

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.

報告人簡介：

吳鏑，南京大學物理學院教授。分別于1997年和2001年獲得復旦大學物理學系理學學士學位和凝聚態物理專業博士學位。研究生期間曾到香港科技大學和德國Max-Plank微結構物理研究所短期訪問。博士畢業后分別在美國猶他大學和加州大學河濱分校物理系作博士后。2007年到南京大學工作。主要研究方向為自旋電子學。2012年及2020年分別獲得國家級人才基金。

8

報告人：Bum-Hoon Lee，Sogang University

時間：5月9日（周五）10:00

單位：中國科學院理論物理研究所

地點：北樓322

Zoom Meeting ID: 870 9584 6799

Passcode: 748111

9

報告人：吳孝松，北京大學物理學院

時間：5月9日（周五）10:30

單位：南方科技大學物理系

地點

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.

報告人簡介：

吳孝松，北京大學物理學院凝聚態物理與材料物理研究所教授。1998年本科畢業于南開大學，2003年在中國科學院物理研究所獲博士學位，之后在美國路易斯安那州立大學和佐治亞理工大學進行博士后研究，2009年入職北京大學物理學院。2012年獲基金委“優青”資助。長期從事低維電子體系在低溫強磁場下的電輸運和熱電輸運行為的實驗研究，并探索對這些行為進行量子調控的手段。目前的研究主要關注拓撲材料、二維磁性材料，以及二維超導材料中的新奇量子輸運性質。在Nature、Science、PRL、Nature Commun.、PNAS等雜志發表論文90余篇。

封面圖片來源：https://www.sohu.com/a/875113261_121010025

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