色散激子态、DNA型手性量子材料、可逆结晶、有机薄膜和太阳能电池 | 本周物理讲座

1

报告人：Jeppe Dyre，丹麦洛斯基尔德大学（RUC）科学与环境系

时间：8月22日 (周二) 14:00

单位：中科院物理所

地点：M楼253

摘要：

玻璃与时间

2

报告人：张俊义、中国科学院精密测量科学与技术创新研究院

时间：8月22日 (周二) 15:00

单位：中科院理论物理所

地点：南楼6620

摘要：

我们以显关联高斯函数作为基函数运用投影算符方法，预言了两个Ps2双激发共振态。一个是在Ps(n=2)+Ps(n=2)阈值之下，另一个是在Ps(n=2)+Ps(n=3)阈值之下。用同样的方法，我们确认了PsH（2s21s）双激发共振态的存在。然后用复转动的方法确定了共振态的位置和宽度。因此，回答了三十多年前科学家提出的一个问题[Phys. Rev. A 41, 68 (1990)]，即：如果在H-(2s2 1Se）阈值之下的里德堡态PsH（2s2 ns）系列中n=1的态存在，它的共振位置在哪里？另外，运用约束变分方法，我们预言了当入射能量为0.238eV时Ps与Li+离子会形成一个宽度约为0.480eV的P波形状共振。

报告人简介：

张俊义于2006年在加拿大的University of New Brunswick获得博士学位。2006-2010年，2011-2015年分别在澳大利亚的Charles Darwin Uinersity、沙特的King Abdullah University of Science & Technology从事博士后研究。2015年作为中国科学院“百人计划”引进人才受聘为中国科学院精密测量科学与技术创新研究院(原武汉物理与数学研究所)研究员，主要从事少体原子分子结构和碰撞的理论研究，在包括Phys. Rev. Lett.、Phys. Rev. A、J. Chem. Phys. 和 EuroPhys. Lett.等期刊发表文章50多篇。

3

报告人：马均章，香港城市大学

时间：8月23日(周三) 14:30

单位：浙江光电子研究院 浙江师范大学

链接：

摘要：

由于激子具有电中性以及巡游特性，使其成为潜在的信息传递媒介。传统实验中通过光学手段在半导体中激发出流动性比较差的激子，这是一种很常规的现象并且得到大量的实验和理论的研究。然而由于屏蔽效应会阻止激子态的形成，金属中大动量激子态目前仍然是难以琢磨的。这个报告中，通过角分辨光电子能谱实验，我们首次揭示了这种可移动的具有色散的束缚激子态在低维金属TaSe3中可以稳定存在，其光电子能谱存在形式表现为主价带上方出现一系列次价带。其稳定存在的原因归功于TaSe3材料的低维度、低态密度以及电声子关联作用。

报告人简介：

马均章于2017年在中国科学院物理研究所获得博士学位，师从于丁洪研究员，并且博士期间以主要负责人身份搭建了上海光源梦之线实验站，对同步辐射光源实验站有着丰富认知与经验。2017至2020年，在瑞士保罗谢勒研究所的瑞士光源从事博士后研究，主要探索拓扑材料的光电子结构。2021年以助理教授身份加入香港城市大学物理系。主要研究兴趣为拓扑材料、超导材料以及关联体系的光电子能谱表征。至今在Nature、Nature Physics、Nature Materials、Science Advances、Nature Communications、Physical Review X、Physical Review Letter、Advanced Materials、Nano Letter等国际知名期刊发表论文40余篇。

4

报告人：颜丙海，Weizmann Institute of Science, Israel

时间：8月23日 (周三) 16:00

单位：清华大学高等研究院

链接：

摘要：

In physics, chirality usually refers to the locking of spin and momentum, such as in Weyl fermions, neutrinos and photons. In chemistry and biochemistry, however, chirality represents the geometric asymmetry of non-superposable mirror images. While seemingly unrelated characters in different fields, the chiral geometry can lead to topological electronic properties in chiral molecules or solids, as we recently discovered. This electronic topology is encoded in the intrinsic orbital nature of the wave function, with an orbital-momentum locking occurring. The chirality information is transferred from the chiral atomic geometry to electron orbital, and to the light or electron spin, which may have broad impacts in fundamental science and technology application, for example, in quantum molecular devices and optoelectronic devices.

报告人简介：

Binghai Yan is an associate professor in the department of condensed matter physics at the Weizmann Institute of Science, Israel. He is a theoretical physicist and currently interested in topological materials and topology-induced phenomena in transport and optics. After completing his PhD at Tsinghua University in 2008, he worked as a postdoc at Bremen University and later at Stanford University.

He was a group leader in the Max Planck Institute in Dresden during 2012-2016 and started his current position at Weizmann Institute in 2017. He was awarded the ARCHES Prize in Germany in 2013, the Israel Physical Society Prize for Young Scientist in 2017 and recognized as a Highly Cited Researcher every year since 2019.

5

报告人：Mingdong Dong，Aarhus University

时间：8月24日(周四) 10:00

单位：中国科学院物理研究所

地点: M楼253会议室

摘要：

Amyloid self-assembly is a complex phenomenon with implications in both degenerative human disorders and materials science. In this context, various structures such as amyloid fibers, particles, and crystals exist, with crystal amyloids being the most stable energetically. However, achieving control over amyloid assembly and reversibly manipulating the crystallization process pose significant challenges. This study aims to explore the reversible formation of macroscopic crystals by examining the effects of temperature, pH, ionic strength, and solvents. Furthermore, in situ microscopy will be utilized to investigate the dynamic process of amyloid disassembly. The reversibility of self-assembly under external stimuli provides valuable insights into the mechanisms of amyloid formation, emphasizing the importance of considering the influence of external factors on crystal formation. Ultimately, the investigation of reversible amyloid crystallization holds promise for the development of innovative strategies in biomaterial design.

报告人简介：

Mingdong Dong is a Professor at Aarhus University in Denmark, He has obtained his PhD at Aarhus University in Denmark. After obtaining his PhD degree, he continued with a Postdoctoral Harvard University, USA. He is an applied physicist with expertise in advanced surface-sensitive scanning probe microscopy (SPM). Professor Dong has made significant contributions to the field by developing several quantitative SPM-based techniques that are used to investigate electronic, mechanical, thermal, chemical, and magnetic properties in biological systems and nanomaterials. These techniques have helped researchers gain a better understanding of the structure-function relationship. With his diverse academic experience in materials science, physical chemistry, and biophysics, Professor Dong has applied his expertise in SPM to solve complex problems in life science and nanoscience. His research has resulted in more than 300 papers published in top international peer-reviewed journals, including Nature, Nature Nanotechnology, Nature Chemistry, Nature Communications, PNAS, Angewandte Chemie, Nano Letters, JACS, ACS NANO, and Advanced Materials. His publications have been cited over 18,000 times. Professor Dong is an active member of various professional organizations, including the Royal Microscopical Society, the American Chemical Society, the Materials Research Society, and the Biophysical Society. He is also a Fellow of the Royal Society of Chemistry.

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报告人：Dr. Wu, Mingjian，Friedrich-Alexander-University Erlangen-Nürnberg, Germany

时间：8月24日(周四) 10:00

单位：中国科学院物理研究所

地点: M楼249会议室

摘要：

Harnessing the complex nano-scale structure in organic thin films is essential to tailor their functionality and performance. For example, the orientation of π-stacking domains and grain boundaries are essential to their electric transport properties in organic field-effect transistors; in bulk hetero-junction organic solar cells (OSCs) it determines exciton dissociation and charge carrier pathways thus dictating performance of the cells. Directly imaging the complex nano-structures in organic thin films using transmission electron microscopy (TEM) is highly challenging due to beam damage. In this talk, I will report our effort towards systematically characterizing the structure of OSCs and organic thin films using TEM: from nanomorphology using analytical methods, evaluating their textures with EF-SAED tomography, and finally emphasize probing local structure information with our recently proposed dose-efficient method 4D-scanning confocal electron diffraction (4D-SCED). Furthermore, I will discuss the merit when this technique is coupled to a state-of-the-art hybrid-pixel direct electron detector. The unique combination of high dose efficiency and high angular resolution makes 4D-SCED an ideal technique for studying the complex nanoscale structure of beam-sensitive organic thin films and solar cells.

报告人简介：

Mingjian Wu is an enthusiastic “nano-photographer” with decade-long experience developing and application of cutting-edge electron microscopy, diffraction, and spectroscopy techniques combined with in situ/operando approaches and data science tools to obtain unique insights in a wide spectrum of modern functional materials. Shortly after his doctor degree from Humboldt University of Berlin, Germany with a top honor grade “summa cum laude”, he joined the Institute of Micro- and Nanostructure Research at University Erlangen-Nurnberg (FAU), Germany in 2015. He was later promoted to staff scientist there and is currently a senior staff scientist, supervising two state-of-the-art TEM instruments. He has published ~50 peer reviewed articles in international renewed journals. He is one of the three awardee of “Outstanding Paper Award” from the European Microscopy Society in 2022.

7

报告人：Fabien Silly，TITANS, SPEC, CEA, CNRS, Université Paris-Saclay, 91191 Gif sur Yvette, France

时间：8月25日(周五) 9:30

单位：中国科学院物理研究所

地点: M楼253会议室

摘要：

Magnetic 2D organic materials can be engineered by taking advantage of the self-assembly of molecular magnets. The magnetic properties of such 2D materials are expected to not only depend of the intrinsic magnetic properties of the individual building blocks but also their arrangement. We selected various flat molecular magnets, based on porphyrin and beta-diketonato skeleton, to engineer 2D magnetic films through self-assembly. The organic arrangement are stabilized by van der Waals interactions or halogen bonds. The complexes have different metal centers to trigger the appearance of different magnetic properties. We investigate using Scanning tunneling microscopy (STM) and synchrotron spectroscopy (XNLD, XMCD) at low temperature. Our measurements reveal that the nature of the complex metal center as well as the complex arrangement drastically influence the magnetic properties of the 2D organic films.

报告人简介：

Dr Silly completed his doctorate in physics with the investigation of photon emission induced by STM on nanostructured surfaces at the Pierre and Marie Curie University, Paris, in 2001. After his experimental study of adatom self-organization mediated by two-dimensional electron gas on metal surfaces in Lausanne University, Switzerland, as a junior lecturer, he joined the Department of Materials at the University of Oxford, UK, in 2003, where he investigated the growth of supported nanocrystals using STM. He received the Young Scientist Award from the British Association of Crystal Growth and the Award of Merit from Department of Materials, University of Oxford for his work in 2005. He then joined in 2005 the Link？ping University, Sweden, to characterize semiconducting surfaces using light-assisted STM. In 2006, Dr. Silly returned to the Department of Materials at the University of Oxford, UK, to investigate multicomponent supramolecular self-assemblies on surfaces. In 2007 he was appointed Assistant Professor at the University of Groningen, the Netherlands and in 2008 he joined the CEA Saclay, France, to develop his research activity in the area of nanoscience. In 2010, Dr Silly was awarded the prestigious Starting Grant by the European Research Council (ERC). He now runs a research group investigating the atomic scale structure and properties of two-dimensional hybrid and magnetic nanoarchitectures.

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报告人：Jie Pan，Senior Editor, Nature Comput. Sci

时间：8月28日 (下周一) 10:00

单位：中科院理论物理所

地点：南楼 6620

摘要：

Topics covered:

--- Overview of Nature Portfolio journals

--- Editorial Process at Nature Computational Science

--- Prepare your manuscript for submission

--- Handle editor and reviewers’ comments and rejection

--- Publishing Interdisciplinary Research in Nature Computational Science

This talk will give an overview of Nature Portfolio journals and the editorial process involved in publishing. The discussions will especially cover the aims and scope of Nature Computational Science, the editorial process, and our vision for this journal in the growing field of computational science. We will also discuss what editors do, what they look for, and how they make decisions, together with some practical tips for writing and submitting a paper to a Nature Portfolio journal.

报告人简介：

Jie joined Nature Portfolio in 2020 as an editor for Nature Computational Science. He received his PhD in Materials Science and Engineering from the University of Kentucky in 2016. From 2016 to 2019, he worked as a postdoctoral researcher in the Materials Science Center at the National Renewable Energy Laboratory (NREL) in Golden, Colorado. Before joining Nature Research, he was an Assistant Research Professor in the Department of Chemical Engineering and Materials Science at Michigan State University. His research was focused on computational materials design for multiple disciplines, such as batteries, photovoltaics, thermoelectrics, water-splitting, and quantum computation. Jie is interested in how novel computational algorithms and the emerging quantum computation help address critical challenges in society, especially related to novel materials discovery.

更多报告信息：

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