磁约束等离子体、超导晶体、氮化镓光电集成芯片、奇异电子序与非常规超导 | 本周物理讲座

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报告人：Cedomir Petrovic Professor, Shanghai Advanced Research in Physical Sciences

时间：10月20日（周二）10:00

单位：中国科学院物理研究所

地点：怀柔X1楼101会议室

腾讯会议：627-603-291

密码：7845

摘要:

Connections among crystal chemistry, disorder and critical temperature Tc are at the forefront of superconductivity. In Fe-based superconductors Tc correlates with the average anion height above the Fe plane. By synthesizing FeSe₁₋ₓSₓ (0 ≤ x ≤ 1) single crystal alloys with atomic defects we find that their Tc is not correlated with the anion height. Instead, changes in Tc(x) and tetragonal-to-orthorombic (nematic) transition Ts(x) on cooling are correlated with Bragg plane and Fe vibrations disorder in direction orthogonal to Fe planes and thereby induced scattering rates (1/τ)(x). The disorder stems from deformed Fe(Se,S)4 tetrahedra with different Fe-Se and Fe-S bond distances. Moreover, high-temperature metallic resistivity in the region of strong disorder exceeds Mott limit and is an example of the violation of Matthiesen's rule and Mooij law which is known to be a dominant when adding moderate disorder past the Drude/Matthiassen's regime in all materials. Scattering mechanism of Mott limit-exceeding resistivity arises from strong Se/S atom disorder in tetrahedral surrounding of Fe. High sensitivity of FeSe to local symmetry breaking is further manifested in a strain-tuned fluctuation-enhanced electron phonon coupling in FeSe even in the absence of chemical disorder. Observations point to intricate connection between nanostructure details and unconventional scattering mechanism, possibly related to charge-nematic or magnetic spin fluctuations.

报告人简介:

Cedomir Petrovic is currently a professor at Shanghai Advanced Research in Physical Sciences since 2023. He is also an Adjunct Distinguished Fellow, Tsung-Dao Lee Institute, Shanghai Jiao Tong University. He received Ph.D. in Physics in 2000 from Florida State University, NHMFL Tallahassee. From 2002 to 2023, he was leading the exploratory materials/crystals growth and characterization lab in the Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory (BNL). Prof. Petrovic has received a number of awards for his work in new materials exploration, including “Marko Jaric” Serbian Physics award 2009, Humboldt Fellowship for Experienced Researchers 2011-2014, Serbian Academy of Sciences and Arts – Foreign Associate Member (2015-present), APS Fellow 2016, BNL Science and Technology Award (2022), and Oriental Pearl Talent Award (2024).

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报告人：Jie Yan，National University of Singapore

时间：10月20日（周二）10:30

单位：中国科学院理论物理研究所

地点：北楼322

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报告人：张凯宇，德国马克斯普朗克等离子体研究所

时间：10月20日（周二）15:00

单位：中国科学院理论物理研究所

地点：南楼6520

摘要:

磁约束聚变装置的整体性能在很大程度上受边界等离子体湍流输运的制约。在边界区复杂的磁拓扑结构下，大振幅等离子体涨落与低频电磁波之间存在显著的非线性相互作用，使得边界湍流的数值模拟与物理理解长期面临挑战。本研究扩展了沿磁力线求解的双流体湍流数值程序，使其能够自洽描述磁力线的波动，从而适用于高性能托卡马克运行模式下边界电磁湍流的研究。通过对不同运行模式开展数值模拟，并结合理论分析与实验验证，本研究揭示了有利于实现高等离子体约束性能与良好排热能力的关键湍流机制。

报告人简介:

张凯宇，于2026年在德国马克思普朗克等离子体物理研究所以最高荣誉(summa cum laude)获博士学位(Dr.rer.nat)，并继续在此从事博士后研究至今，研究方向为聚变等离子体的电磁湍流。此前就读于北京航空航天大学，分别于2018和2021年在航空学院和宇航学院取得航空工程学士和宇航推进硕士学位。以第一作者身份在JCR 1区期刊发表论文5篇。其中一篇获Physical Review Letters 编辑精选。

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报告人：Prof. Beatrice Ruta，Institut Néel, University Grenoble Alpes and CNRS

时间：10月22日（周四）14:00

单位：中国科学院物理研究所

地点：D楼208会议室

摘要:

Glasses are out-of-equilibrium materials whose properties are governed by the interplay between atomic structure and dynamics. Understanding this relationship is essential to unravel the microscopic mechanisms underlying the glass transition, the slow relaxation processes below the glass-transition temperature (Tg), and the evolution of glass stability.

This talk will explore structure-dynamics relationships in glasses, with a particular focus on metallic glasses. For this purpose, we combined different advanced synchrotron based and laboratory techniques, to investigate atomic-scale dynamics and their connection to structural relaxation over many length and time scales.

The first part will address the microscopic origins of the glass transition and the dynamical processes occurring across and below Tg, whereas the second part will focus on the control of glass stability and relaxation through thermal and mechanical protocols, including temperature, pressure, and sample preparation . These latter approaches can drive glasses towards distinct metastable states, modifying their relaxation behaviour and physical properties. By examining how processing history influences glass structure, dynamics, and stability, we explore pathways to understand and tailor the behaviour of amorphous materials.

报告人简介:

Beatrice Ruta is a researcher at the Institut Néel of the French National Research Center (CNRS) in Grenoble, France, and a visiting scientist at the European Synchrotron Radiation Facility (ESRF). With 20 years of experience in glass physics, she has authored over 70 scientific papers and delivered more than 50 invited talks at international conferences and workshops. Her research focuses on the structure and dynamics of glasses, particularly metallic glasses, using advanced X-ray techniques, notably X-ray Photon Correlation Spectroscopy, to investigate atomic motion, relaxation processes, and glass stability. She has led major research projects, including a European ERC Starting Grant on glass dynamics (2021–2026) and long-term synchrotron projects. Her awards include the ESRF Young Scientist Award (2015) and the CNRS Bronze Medal (2020).

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报告人：孙海定，中国科学技术大学集成电路(微电子)学院

时间：10月22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:

三族氮化物半导体（group III-Nitrides），包括GaN，AlN，InN及其合金材料，由于它们是直接带隙半导体且禁带宽度可以从0.6 eV连续可调至6.2 eV，是制备光电子器件（LED，激光器，探测器等）的理想材料之一，工况模式下器件的光谱工作范围可以覆盖整个从深紫外200 nm到近红外波段。其中，基于AlGaN/GaN异质结的紫外光电子器件，由于其工作波长短，且光子能量相较于可将光具有更高的能量，在日盲光通信，智能光成像与探测领域中扮演着重要的角色。本次报告将围绕氮化镓基新型紫外光电子器件物理、集成与智能芯片研发，提出了一系列氮化镓基光电集成芯片新架构（新型场效应调控三电极光电集成二极管、超高响应度类雪崩光电晶体管、垂直单片集成与级联二极管架构等），并展示了它们在高速日盲光通信、微型紫外光谱仪和光谱成像芯片、雪崩探测及感存算一体成像芯片中的创新应用。

报告人简介:

孙海定，中国科学技术大学集成电路(微电子)学院教授/博导，中科大iGaN实验室负责人，入选国家杰青/优青，中国科学院百人计划等人才项目。长期致力于氮化镓（GaN）半导体材料外延、紫外光电器件和电子器件设计与制备研究。共发表SCI论文200余篇，ESI高被引论文10+篇，Google引用近万次，其中以通讯作者发表包括Nature Photonics（1篇），Nature Electronics（3篇，其中1篇封面），Nature Com.（2篇），Sci. Adv.等国际重要SCI论文100+篇和8篇IEDM等国际电子器件顶会论文。受邀撰写4本专著章节，获国内外专利授权20余项，部分技术与工业界合作已经产业化。目前受邀担任多个国际期刊如IEEE Photonics Technology Letters副主编以及IEDM/CLEO/IEEE IPC等多个国际电子/光电子器件领域顶会的组委会委员和TPC成员，并担任Journal of Semiconductor、Nano-Micro Letters、和 Material Today Electronics 等期刊青年编委。以项目负责人主持国家重点研发计划、国家基金委等项目等并连续6年入选全球高被引科学家榜单。

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报告人：Pavel Grigoriev，L. D. Landau Institute for Theoretical Physics, RAS

时间：10月22日（周四）15:00

单位：中国科学院理论物理研究所

Zoom: 391 106 6816

Passcode: 202512

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报告人：吴贤新，Institute of Theoretical Physics, CAS

时间：10月22日（周四）16:00

单位：中国科学院理论物理研究所

Zoom: 391 106 6816

Passcode: 202512

封面图片来源：

https://zhuanlan.zhihu.com/p/595820260

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