原子核物理中的密度泛函理论、量子反常霍尔绝缘体、星系团、Muon螺线管实验 | 本周物理讲座

报 告人：Dr. Wei Yuan，The Pennsylvania State University

时间：11月14日（周二）10:00

单位：中科院物理所

腾讯会议ID:  655-404-642

会议密码：1114

摘要：

The emergence of quantum phenomena has radically changed our landscape of condensed matter physics, leading to the explorations of various intriguing subjects, such as spintronics, topological insulator, superconductivity, among others. It has become significantly important to explore collaborative projects involving various quantum behaviors. These initiatives are instrumental in expanding our comprehension of fundamental physics and practical application. In the first part of my presentation, I will talk about our research about the long-distance diffusion of spin current in the canted antiferromagnetic Cr2O3 films. This particular system provides a captivating platform for the study of spin superfluid. Moving on to the second part, I will discuss our recent progress on the electrical switching of the edge states chirality in mesoscopic Hall bar devices of quantum anomalous Hall (QAH) sandwich heterostructures through the utilization of spin-orbit torque by applying a current pulse under a suitably controlled gate voltage. The QAH insulator exhibits insulating properties in its interior while allowing electrons to travel with zero resistance along one-dimensional conducting edge channels. Our findings not only advance our knowledge of the interplay between magnetism and topological states but also expedite easy and instantaneous manipulation of the QAH state in energy-efficient electronic and spintronic devices as well as quantum information applications.

报告人简介：

Wei Yuan is currently serving as an assistant research professor in the group led by Prof. Cui-Zu Chang in the Department of Physics at The Pennsylvania State University. Dr. Yuan obtained his Bachelor of Science degree from the Department of Physics, Jilin University in 2013. He further archived his PH. D. degree from the International Center for Quantum Materials, School of Physics, Peking University in 2018 under the mentorship of Prof. Wei Han. Following his studies, he subsequently dedicated three years to the role as a postdoctoral scholar, collaborating with Prof. Jing Shi at University of California, Riverside, before taking up his current position at Penn State in 2021. Dr. Yuan’s research interests include spin transport in magnetic insulators, spintronics in topological insulators, and topological superconductivity, etc. His dedication to these areas has been evident through his publications, some of which have graced the pages of high impact journals such as Nature Materials, Science Advances.

报告 人：张星星，中国科学院高能物理研究所

时间：11月14日（周二）15:00

单位：中科院物理所

地点：怀柔园区X1南楼101会议室

腾讯会议ID:  626-389-132

会议密码：1114

摘要：

铝基材料广泛应用于航空航天、交通运输和国防工业等关键领域。对轻量化、高能效和绿色发展的持续追求要求准确表征材料内部的力学行为，并实现材料与零部件的强度分析和可靠性评价。常规组织和性能分析手段所能提供的支撑有限，先进光源（同步辐射和中子）为上述目标提供了独特表征手段，可实现铝基材料内部力学信息的原位无损表征，实验数据有助于建立和校验理论模型。本报告介绍了铝基复合材料多尺度残余应力的实验测量方法和预测模型，并对增材制造铝合金微观力学行为的原位测量和理论预测进行了分析讨论。

报告人简介：

张星星，中国科学院高能物理研究所特聘青年研究员，基于先进光源（包括同步辐射和中子）与计算模拟开展金属材料的多尺度力学行为研究。已发表37篇SCI期刊论文，一作和通讯作者论文24篇，H指数20。已授权软件著作权2项；授权发明专利5项。创建了测量与分离金属材料第一类和第二类残余应力的衍射表征方法学。两次入选德国海因茨·迈尔-莱布尼茨研究中心MLZ年度研究亮点工作；入选MLZ官方网站残余应力中子衍射表征经典案例；入选德国FRM II中子源Stress-Spec工程材料线站国际评估代表性研究成果。获亚太中子散射协会AONSA青年研究人员资助计划资助。中国颗粒学会科技进步奖一等奖、辽宁省自然科学学术成果奖二等奖、获F5000论文奖、辽宁省金属学会优秀科技论文二等奖。

报告 人：吴为，中山大学物理学院

时间：11月14日（周二）15:00

单位：中科院物理所

地点：M830

摘要：

铜氧化物高温超导体在超导温度之上的“正常态”，由于电子之间的关联作用极强，系统会展现处许多反常性质，比如赝能隙、奇异金属态等。而团簇扩展的动力学平均场理论(CDMFT)，由于其可以有效地处理短程空间涨落以及时间涨落，被广泛运用于高温超导及相关问题的研究。在本报告里，我们运用CDMFT方法，较为系统地研究了二维Hubbard模型的正常态性质。我们发现，在欠掺杂区域出现的赝能隙态，其中的电子散射呈现粒子空穴非对称的准极点形式，其出现会强烈地重整化费米面，这一结果解释了为什么实验上赝能隙态只存在于空穴型费米面的物理区间。进一步分析发现，赝能隙态的起源是短程反铁磁关联。在过掺杂区域，在此模型中我们发现了低温下温度线性电阻率的奇异金属行为。其特性与实验发现符合很好，通过涨落分析方法我们发现，在过掺杂区域，微弱的剩余反铁磁关联实际上也是奇异金属行为的物理起源。

报告人简介：

吴为，中山大学物理学院副教授。2012年博士毕业于中国科学院物理研究所。其后在加拿大舍布鲁克大学、法国巴黎综合理工学院从事博士后研究工作。2018年入职中山大学工作。现在主要的研究方向是，运用量子蒙特卡洛，动力学平均场理论等数值计算方法研究非常规超导电以及相关量子多体问题，比如重费米子系统、铜氧化物高温超导，以及最近发现的镍基超导体等。

报告 人：刘奇航，南方科技大学

时间：11月14日（周二）15:00

单位：合肥微尺度物质科学国家研究中心、中国科大国际功能材料量子设计中心(ICQD)

链接： https://www.koushare.com/lives/room/397973

摘要：

磁有序材料的对称性和物理性质一直被认为用磁群可以完整地描述。近期，人们发现一些磁性材料的性质（例如altermagnets）需要用一种更大的，结合独立的自旋和空间对称操作的晶体群来描述，这种晶体群称为自旋群。在这个报告中，我们介绍了自旋群理论的最新发展，包括对超过100000个自旋空间群的详尽枚举，对于共线，共面和非共面磁结构的自旋点群和空间群的分类，以及自旋群在动量空间中的不可约共表示。我们进一步展示了自旋群在超出磁群框架的物理效应方面的一些理论和实验结果，包括反铁磁体CoNb3S6中的新型准粒子，反铁磁体中的新型自旋劈裂效应，以及关联增强的自旋-轨道耦合效应等。

报告人简介：

刘奇航，南方科技大学副教授，本科及博士均毕业于北京大学物理学院，曾任美国西北大学博士后、美国科罗拉多大学博尔德分校助理研究员。主要从事计算凝聚态物理研究，研究兴趣聚焦于量子材料中的对称性新理论，多自由度耦合现象新效应，以及相关的新材料设计筛选 。发表SCI论文80余篇，H指数35。2018年作为独立PI后发表通讯作者文章30余篇，包括11篇PRL/PRX、4篇Nat. Commun. 、3篇Natl. Sci. Rev. 等。2020年作为项目负责人获批国家重点研发计划“量子调控与量子信息”重点专项（青年项目），2022年获批深圳市杰青项目。

报告 人：施璐，Nature Nanotechnology

时间：11月16日（周四）15:00

单位：北京大学物理学院

地点：物理楼中212教室

摘要：

Lu will talk about the scope of Nature Nanotechnology and an overview of Nature journals. And she will share her experience on the editorial process (the workflow and the statistical data) and disclose the criteria of Nature journals from an insider’s view. Through the talk, you will know better on what kind of papers a highly selective journal is looking for, how the editors decide whether to send a paper out or not, what they will do when the reviewers’ comments are contradictory. And Lu is happy to share with you her personal experience as an editor if you are interested together with some practical tips for writing and submitting a paper to a Nature journal.

报告人简介：

Dr. Lu Shi joined Nature Nanotechnology in April 2023 from Wiley, where she was the Editor-in-Chief of Advanced Electronic Materials and Deputy Editor of Advanced Materials. Prior to her editorial career, she worked on 2D materials growth and magnetoelectric transport behavior of van der Waals heterostructures. For her work, she received a joint PhD in Materials Science and Physics from the Université Catholique de Louvain, Belgium and Université Grenoble Alpes, France. She obtained her BEng and MSc in Materials Science and Engineering from Shanghai Jiao Tong University and Shanghai Institute of Ceramics, Chinese Academy of Sciences. Lu is based in Shanghai.

报告 人：Weiguang Cui，马德里自治大学/爱丁堡大学

时间：11月16日（周四）15:30

单位： 北京大学物理学院

Meeting ID: 878 0749 8801

Passcode: 711181

摘要：

What we see is not what we understand, what we produce is what we know. In this talk, I will present what we know (or don’t know) about galaxy clusters by reproducing them with different state-of-the-art hydrodynamic simulations from the300 collaboration project (https://the300-project.org/). In detail, I will focus on 4 different aspects: the cluster dynamical state, the lensing crisis, the predictions with ML and the filamentary structures around the cluster.

报告人简介：

Dr Weiguang Cui graduated from Shanghai Astronomical Observatory in 2010. He uses numerical simulations to study and understand our Universe, which includes, but not limits to, galaxy formation, galaxy cluster and group, large-scale structure and cosmology. He has worked in many different places, and he is currently the atracción de talento senior researcher at universidad autonoma de Madrid.

报告 人：Claudia-Elisabeth Wulz，Institute of High Energy Physics of the Austrian Academy of Sciences

时间：11月16日（周四）16:00

单位：清华大学物理系

地点：理科楼郑裕彤讲堂

摘要：

CMS, the Compact Muon Solenoid experiment, operates at the Large Hadron Collider of CERN. It has been designed to answer important questions about our Universe. With its huge detector and unique magnet system the exploration of a vast range of physics topics is possible, from searches for new phenomena or resonances, dark matter, exotica, to precision studies of the Higgs boson and other standard model particles. The CMS Collaboration consists of over 6000 people, including 2400 students, and more than 250 institutions from all the world, including China.The presentation will feature highlights from the detector construction and upgrades as well as a selection of physics results. It is particularly intended to inspire the young generation of physicists and engineers.

报告人简介：

Claudia-Elisabeth Wulz is an Austrian physicist employed by the Institute of High Energy Physics of the Austrian Academy of Sciences. She began her career at the UA1 experiment, first as a CERN summer student in 1982, and later as a fellow, where she participated in the discovery of the W and Z particles, working in the group of the future Nobel Prize winner Carlo Rubbia. She obtained her PhD in 1986 from TU Vienna. After UA1, she participated in the CP-violation experiment NA48, and joined CMS right from the start, working since on the trigger system and physics beyond the standard model with her group. She has been a member of the CMS Management Board and just completed her term as Collaboration Board Chair. She also enjoys lecturing on particle and astroparticle physics to university students and communicating science to the general public.

报告 人：Robert Charity，美国华盛顿大学圣路易斯分校

时间：11月17日 (周五) 10:00

单位：复旦大学核科学与技术系/现代物理研究所、核物理与离子束应用教育部重点实验室、国家自然科学基金委-理论物理专款上海核物理理论研究中心 

链接： https://www.koushare.com/lives/roo‍m/461264

摘要：

The technique of invariant-mass spectroscopy has been used to study the ground and low-lying states in proton-unbound nuclides. These unbound nuclides have been created using knock-out, pick-up, and charge-exchanged reactions with fast beams (E/A~70 MeV) at the National Superconducting Cyclotron laboratory. Ground-state nuclide located beyond the proton drip line have been observed to decay by emitting from one to five protons before leaving a particle-bound residue. I will show many examples of such decays including nuclei which decay by the simultaneous emission of two-protons where the momentum correlations between the decay products give information on their nuclear structure.

报告人简介：

Professor Robert Charity is a distinguished researcher with a rich history in the field of nuclear physics. His academic journey began with a Bachelor of Science in Physics with Honors from the University of Queensland, Brisbane, Australia, in 1980. He went on to obtain his Ph.D. in Nuclear Physics from the Australian National University in Canberra, Australia. In 1984, He became a visiting post-doctoral research associate at Lawrence Berkeley National Laboratory, and went to GSI, Darmstadt, as guest scientist in 1988. Professor Charity joined Washington University at St. Louis since 1990. His work encompasses a wide range of topics, focusing on nuclear structure and nuclear reactions. One of his notable contributions lies in the exploration of many-body effects within nuclei, particularly how proton correlations in calcium (Ca) nuclei evolve with an increasing number of neutrons. Throughout his career, he has received several accolades, including the title of Fellow of the American Physical Society and the distinction of being an Outstanding Referee for the same organization. 

报告 人：Peter Ring，德国慕尼黑工业大学

时间：11月17日 (周五) 15:00

单位：北京大学物理学院

链接： https://www.koushare.com/liv‍es/room/979749

摘要：

密度泛函理论是一种原则上精确的描述量子多体系统的方法。该方法起源于上世纪五十年代，主要被应用于多电子体系，如原子、分子和固体结构等，,多年来一直是描述量子多体系统最先进的方法之一。相比于求解多体薛定谔方程得到依赖于数百个坐标变量的多体波函数，密度泛函理论的优势在于其简洁性: 它基于能量密度泛函，即体系的基态能量，而这样一个泛函只依赖于具有三个坐标变量的局域密度。电子体系涉及的相互作用是众所周知的库伦力，其能量密度泛函目前已达到很高的精度。在原子核物理中，体系更加复杂，非相对论性和相对论性的密度泛函理论在近半个世纪以来也获得了成功。本次报告将概括密度泛函理论的基础，特别是该方法在描述原子核体系时的优势和面临的挑战。报告还将介绍该方法在远离稳定线的原子核以及天体物理体系方面的最新应用。

报告人简介：

Peter Ring，德国慕尼黑工业大学教授，欧洲物理学会核物理最高奖Lise Meitner奖获得者，世界知名的原子核物理学家。曾担任物理学顶级期刊《物理评论快报》等刊物编委，1992年获得Humboldt - Mutis研究奖2005年成为Hellenic Nuclear Physics Society名誉会员，2010年入选北京大学首批教育部海外名师项目，2012年被评为美国物理学会《物理评论》和《物理评论快报》杰出审稿人。Peter Ring教授在量子多体理论、奇特原子核、超重原子核等领域取得了丰硕的成果，发表学术论文500多篇,引用累计达6万多次，H因子为109，特别是其专著《The Nuclear Many-Body Problem》自1980年出版以来多次重印，是原子核物理学界最受欢迎的经典著作之一。

10   SMEFT vs HEFT: multi-Higgs phenomenology