1 High-temperature Superconductivity and Exciton Superfluidity in 2D Materials
报告人：Dr. Liguo Ma，Cornell University
时间：11月22日（周二）10:00
主办：中科院物理所
Tencent Meeting: 280-464-496
Password: 1122
摘要：
Strong correlation is believed the driving force for unconventional high-temperature superconductivity (HTS). It could also suppress the density/phase fluctuation and stabilize high-temperature superfluid of another composite boson in solids, excitons. In this talk, I will present our efforts in understanding HTS in strongly correlated two-dimensional (2D) materials and hunting for high-temperature exciton superfluid in designed Van de Waals heterostructures. The former part is a short introduction to HTS in 2D crystals of a high-Tc cuprate compounds, Bi2Sr2CaCu2O8+x (Bi-2212), obtained by STM/STS. In the later part, I will share our recent progress in creating a strongly correlated excitonic insulator in TMDs double layers. Using quantum capacitance measurements, we obtained its thermal dynamic phase diagram that reveals both the Mott transition and interaction-stabilized quasi-condensation. I will also talk about my potential research interest of quantum many-boson states enabled by this excitonic system.
报告人简介：
Dr. Liguo Ma is currently a postdoc at Cornell University. He obtained his PhD in Condensed Matter Physics from Fudan University in 2019. His research has been focusing on strongly correlated phenomena and quantum condensation in low-dimensional materials.
2 Possible Kitaev Magnets with 3d Electrons: Hope, Reality and Opportunity
报告人：李源，北京大学
时间：11月22日（周二）10:00
主办：中山大学物理学院中子科学与技术中心
会议链接：https://www.koushare.com/lives/room/741445
摘要：
Magnetism in cobalt compounds has an interesting facet due to the element’s non-negligible spin-orbit interplay. In recent years, several cobalt oxides with layered honeycomb crystal structures have been proposed to have the potential to realize the celebrated Kitaev model for quantum spin liquids. For this reason, they are becoming intensively studied as 3d-electron analogues of 5d iridates and 4d α-RuCl3. From a crystal grower and spectroscopist’s view point, I will present our study on two of these compounds: Na2Co2TeO6 (NCTO) and Na3Co2SbO6 (NCSO), which look similar at first sight. Our data suggest that subtle differences make the two systems highly contrasting against each other: NCTO has a nominally C3-symmetric crystal structure, whereas NCSO is monoclinic; NCTO is more antiferromagnetic than NCSO, probably due to further-neighbor interactions. At the end of the day, the two systems might not be very close to the idealized Kitaev model, but are nonetheless highly interesting. Experimental hints at realizing novel quantum magnetism will be discussed, along with open issues.
报告人简介：
Yuan Li received his B.S. degrees from Peking University in 2004, and Ph.D. degree from Stanford University in 2010. He was a Humboldt Research Fellow at the Max Planck Institute for Solid State Research, Germany, from 2010 to 2012. Since 2012, he has been working as an associate professor at the International Center for Quantum Materials, Peking University, where he received tenure in 2018. His research involves state-of-the-art crystal growth and the use of scattering spectroscopy, in particular neutron and photon scattering, for studying the structure and dynamics of materials with strong electron correlation and novel quasiparticle excitations. He has been selected for an elite research program supported by the MOST of China and a recipient of Sir Martin Wood China Prize.
3 分子光电材料的激发态动力学
报告人：张春峰，南京大学
时间：11月22日（周二）12:00
主办：江苏省物理学会
会议链接：https://www.koushare.com/lives/room/581434
摘要：
传统物理模型假设太阳能电池工作在准静态平衡条件下。材料吸收一个光子产生一对激发态电子，光电转换效率受制于载流子的过剩能量热损耗和克服电子空穴束缚损耗，单节器件效率最高约33%，即所谓Shockley-Queisser极限。利用低成本设计，寻求突破极限光电转换方案是业界重要挑战。为此，课题组发展超快光谱学方法，研究分子光电材料中的光诱导的非平衡态过程，探索低驱动能激子拆分、单线态裂分等有望突破传统模型限制的激发态动力学机制。
报告人简介：
张春峰，南京大学物理物理学院教授，博士生导师。在复旦大学获得学士(2002)和博士(2007)学位，2010年入职南京大学。曾在美国宾夕法尼亚州立大学从事博士后研究(2007-2010)，在奥地利林茨大学(2006)、美国科罗拉多大学JILA研究所(2015)访学。致力于发展二维电子光谱、瞬态磁光等超快光谱学方法，研究超快时间尺度的光和物质相互作用，寻求突破现有光电转换效率的新机制。曾在Nature，Nature Energy, Nature Chemistry, Nature Commun.,PRL等期刊发表论文170余篇。曾获江苏省杰出青年(2016)、国家优秀青年(2019)、国家杰出青年(2022)等基金支持。
4 Quantum-enhanced sensing via sequential measurements
报告人：Victor Montenegro, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China
时间：11月22日（周二）19:00
主办：浙江师范大学物理系
会议链接：https://www.koushare.com/lives/room/071816
摘要：
In this talk, I will present our latest findings in the quantum sensing field, which permits quantum-enhanced sensitivity via a finite number of sequential measurements. Indeed, the superiority of quantum sensors over classical counterparts is manifested in their enhanced sensitivity and resource efficiency. So far, all the existing protocols for quantum-enhanced sensing rely on quantum superposition. Here, we propose a new remote quantum sensing protocol by exploiting the wave-function collapse of quantum measurements, as another unique quantum feature, for obtaining quantum-enhanced sensitivity. A sequence of local measurements followed by free evolution of a spin-chain probe allows estimating a local field remotely. For a given time resource, increasing the number of the sequence enhances the precision beyond the standard limit, reaching the ultimate precision bound.
报告人简介：
Dr. Montenegro was born in Santiago de Chile in the mid-80s. He did the course of the Physics program at Universidad Catolica de Chile (a.k.a, PUC), and obtained B.Sc and M.Sc degree in Physics under the supervision of Prof. Miguel Orszag. His research was focused on Quantum Optics and Quantum Information in cQED. In 2011, he was awarded a 4-year scholarship from the Chilean government (Conicyt) to course a Ph.D. degree at University College London (a.k.a UCL), this time under Prof. Sougato Bose’s supervision. During this time, he investigated on cavity quantum optomechanics and hybrid spin-optomechanical systems. After the Ph.D. degree, he returned to PUC to work as the principal investigator with Prof. Orszag. Currently, he is part of Prof. Abolfazl’s group in Chengdu under the Talent Introduction Program, focused on quantum metrology.
5 Experimental searches for the chiral magnetic effect – Isobar collisions
报告人：Fuqiang Wang (王福强)，Purdue University
时间：11月23日(周三) 10:00
主办：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
会议链接：https://www.koushare.com/lives/room/304550
摘要：
The chiral magnetic effect (CME) - manifest charge separation under strong magnetic field arising from fundamental symmetry breaking in QCD - has been extensively sought for in relativistic heavy ion collisions. In order to eliminate flow-induced physics backgrounds, isobar collisions have been conducted at RHIC and no evidence of the CME has been observed by the STAR experiment. I will examine those isobar collisions in more depth than has been published, and attempt to enlighten on what level of magnitude a CME signal is allowed by the STAR isobar data.
报告人简介：
Fuqiang Wang is a professor of physics at Purdue University and Huzhou University. He is a high-energy nuclear experimentalist, and a member of the RHIC-STAR, CERN-CMS, and NICA-MPD Collaborations. Priorly he conducted fixed-target experiments at BNL and CERN. He worked on many areas of research in heavy ion physics; his latest interest is in experimental search for the chiral magnetic effect predicted by quantum chromodynamics. He received his Ph.D. from Columbia University in 1996, and worked as a postdoctoral fellow at LBNL before joining the Purdue faculty.
6 铁硒/氧化物界面超导的调控与机理研究
报告人：封东来，中国科学技术大学
时间：11月23日（周三）19:00
主办：蔻享学术
会议链接：https://www.koushare.com/lives/room/655396
摘要：
高温超导是凝聚态物理领域的研究前沿，揭示其机理和提升超导配对温度是人们长期的梦想。2012年发现的单层铁硒/钛酸锶界面超导为高温超导研究提供了新契机。我们围绕铁硒/氧化物界面超导开展了全面的界面调控和原位电子结构测量，发现了单层铁硒/氧化物界面超导的关键电子结构特征，并建立了掺杂、应力相图；精确调控界面关键参数，系统地揭示了铁硒界面超导增强机理是界面电声子耦合与非常规配对机制的协同作用；设计并构建新型界面超导体系，将超导配对温度最高提升至80K，超过液氮沸点。这些结果为理解高温超导电性提供了新的线索。
报告人简介：
封东来，中国科学技术大学国家同步辐射实验室主任、“严济慈”讲席教授、中国科学院院士、美国物理学会会士。他致力于应用同步辐射谱学和散射技术、扫描隧道显微镜和分子束外延等来构筑和理解高温超导、拓扑超导、界面与二维体系等复杂量子材料及其原型器件，共发表论文190余篇。获得过国家自然科学二等奖、海外华人物理学会亚洲成就奖、亚太物理学会联盟杨振宁奖等奖励。
7 构筑拓扑量子物态
报告人：何珂，清华大学物理系
时间：11月24日（周四） 14:30
主办：清华大学物理系
地点：理科楼郑裕彤讲堂
摘要：
很多奇异的拓扑量子物态和效应可以通过简单的理论模型获得，这使我们有可能通过调控、组合已有材料体系以可控的方式在实验上实现它们。本报告将介绍过去几年我们在利用分子束外延技术探索更高温度的量子反常霍尔效应体系和马约拉纳纳米线体系方面的工作。
报告人简介：
2000年于山东大学物理系获得学士学位。2006年于中国科学院物理研究所获得博士学位。2006年到2009年在日本东京大学物理系进行博士后研究。2009年到2013年任中国科学院物理研究所副研究员。2013年到2016年任清华大学物理系副研究员。2016年至今任清华大学教授。主要研究方向是低维拓扑量子材料的分子束外延生长和电子结构调控及其量子效应。曾获中国科学院杰出科技成就集体奖（2011）、国家杰出青年科学基金（2013）、中国青年科技奖（2013 年）、日本仁科亚洲奖（2015）、叶企孙物理奖（2017）、国家自然科学一等奖（2018）等荣誉和奖励。
8 Holographic local operator quenches in BCFTs
报告人：Takato Mori，KEK/SOKENDAI
时间：11月25日（周五）10:00
主办：中科院理论物理所
会议链接：https://us02web.zoom.us/j/85682892251?pwd=QURiMXFIRnFhUyt6M3luUWRRYzRodz09
Zoom：856 8289 2251
密码：957697
摘要：
I present a gravity dual of local operator quench in a two-dimensional CFT with conformal boundaries. This is given by a massive excitation in a three-dimensional AdS space with the end of the world brane (EOW brane). Due to the gravitational backreaction, the EOW brane gets deformed in a nontrivial way. I show that the energy-momentum tensor and entanglement entropy computed from the gravity dual and from the BCFT in the large c limit match perfectly. Surprisingly, this comparison avoids the folding of the EOW brane in an elegant way. This talk is based on a joint work, JHEP05(2022)060 [arXiv:2203.03851], with Tadashi Takayanagi, Tomonori Ugajin, Taishi Kawamoto, and Yu-ki Suzuki in the entanglement group at Yukawa Institute for Theoretical Physics.
报告人简介：
Takato Mori is a final-year graduate student at the Graduate University for Advanced Studies, SOKENDAI, whose home institution is High Energy Accelerator Research Organization (KEK). Takato has been working on entanglement in quantum field theory and many-body systems motivated by holographic duality. Takato is currently visiting Perimeter Institute for Theoretical Physics to investigate quantum information theoretic aspects of the AdS/BCFT correspondence.
9 W-玻色子质量的最新测量对新物理的启示
报告人：杨金民，中科院理论物理研究所
时间：11月25日（周五）18:30
主办：中国科学院大学物理学院
地点：雁栖湖校区西区教一楼115
摘要：
2022年美国费米实验室CDF Ⅱ公布了W粒子的最新最精确的测量结果，实验测量值与标准模型预言值的偏差达到了7个西格玛，从而震惊世界，这大大增强了高能物理学家对于新物理的信心。本讲座的内容包括∶（1）介绍W玻色子的来源； （2）介绍W玻色子质量的标准模型预言；（3）介绍W玻色子质量的最新实验测量结果； （4）介绍W-玻色子质量的最新实验测量对新物理特别是主流新物理理论-超对称的启示。
报告人简介：
杨金民，中国科学院理论物理研究所研究员、中国科学院大学岗位教授和日本东北大学兼职教授。1995年取得博士学位，1996-2000年先后在美国西北大学、爱荷华州立大学和日本东北大学做博士后研究，2000年中科院‘引进国外杰出人才’回中国科学院理论物理研究所任研究员，一直从事高能物理的理论研究，在超出标准模型的新物理特别是超对称理论和希格斯物理方面有系列深入的研究，获得过国家杰出青年基金、百千万人才工程国家级人选、王淦昌物理奖、中科院优秀导师奖、朱李月华优秀导师奖、BHP Billiton优秀导师奖和国科大（中科院研究生院）优秀教师荣誉称号。
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