1基于拉盖尔高斯模式激光的高转速物体成像与监控 | 应用物理前沿系列报告
报告人:张勇,南京大学
时间:12月8日(周二)14:00
单位:中科院物理所
参会方式:腾讯会议
腾讯会议ID:342 936 232
会议密码:1208
直播地址:http://as-conf.iphy.ac.cn/liveRooms?lid=18
摘要:
旋转是常见的运动形式,从原子和分子、工业到天体都存在这种运动规律。然而,对航空发动机、储能飞轮、高速离心机等高速旋转物体,其工作状态的在线实时检测是一个重大课题,目前仍然缺乏有效的技术手段。我们发展了一种基于拉盖尔-高斯模式激光的高速旋转物体实时成像技术,可以对旋转物体进行实时重构、边缘增强、缺陷监控等处理。其中,激光光源是基于周期极化铌酸锂晶体的可调谐、高纯度、高效率的拉盖尔-高斯模式光参量振荡器;探测器可以采用单点探测器,其响应速度比两维相机要快几个数量级,从而实现对工业领域中超高转速物体的实时成像和识别,具有巨大的应用潜力。
报告人简介:
张勇,南京大学教授,博士生导师,南京大学青年特聘教授,国家优秀青年基金获得者, 教育部新世纪人才,量子电子学与光学工程系主任。2007年在南京大学物理系获得博士学位,2008年和2009年在美国Arkansas大学从事博士后研究,2010年2月回到南京大学现代工程与应用科学学院任职。主要研究方向为微结构光电功能材料、非线性光学和精密测量,在Nature Photon., Phys. Rev. Lett., Nature Commun., Adv. Mater., Nano Lett.,ACS Nano等刊物发表论文70多篇,被引用1300多次。曾获得中国光学十大进展、江苏省青年光学科技奖、南京市自然科学优秀论文一等奖、全国优秀博士论文提名等。先后主持6项基金委项目(包括重大研究计划重点支持项目1项),并参与3项科技部重点研发计划等。
报告人:闫鹏飞,北京工业大学
时间:12月8日(周二)10:00
单位:中科院物理所
地点:中科院物理研究所M楼249会议室
摘要:
锂离子电池和钠离子电池是目前能量密度最高的二次电池,持续提升二次电池材料的能量密度、稳定性和安全性是社会和国家的战略需求。层状结构的氧化物正极材料是实现二次电池性能提升的关键材料,持续开发其性能潜力带来了诸多材料方面的挑战,即电池材料在循环过程中发生的各种失效行为。这些材料的失效机制不仅带来电池性能的快速衰减也为安全性带来隐患,因此,开发利用层状正极材料的潜力关键在于有效抑制其材料的失效。本报告将以电子显微学的分析技术为主要手段,根据我们对多种层状正极材料(富锂、三元、钴酸锂、钠电等)的表征,讲述我们对表界面衰退和体材料衰退方面的理解。
报告人简介:
闫鹏飞,北京工业大学教授,博士生导师。2010年博士毕业于中科院金属研究所,2010-2017先后在日本NIMS和美国太平洋西北国家实验室(PNNL)从事电子显微学研究。目前的研究领域是利用电子显微学研究二次电池材料的基本结构、储能机理以及失效和改性机制。在Nature Energy, Nature Nanotechnology, Advanced Materials等期刊发表SCI学术论文90余篇,引用6000余次,H因子38。2018年入选北京市青年海聚人才,北京市特聘专家。2019年入选国家青年人才计划。IEEE PES 中国储能材料与器件分委会常务理事。
3Integrated Communication Photonic Devices | International Young Scholar Forum
报告人:Dr. Ping Ma, Swiss Federal Institute of Technology Zurich, Switzerland
时间:12月8日(周二)16:00
单位:中科院物理所
参会方式:腾讯会议
会议ID:986 853 783
会议密码:1208
会议链接:https://meeting.tencent.com/l/BgsTqkIQ1DFR
摘要:
Mobile internet, cloud services and Internet of Things drive optical networks adoption as the mega data centers are poised for significant growth to support the market. The relentless growth of data traffic raises the need for ultra-high-speed networks towards operations at 100 Gb/s transmission bit rate and beyond. Currently, the development of photonic device technologies lags significantly behind the imperative demands on the device performance, particular the bandwidth and efficiency. A major effort is underway to build high-speed, compact, and energy efficient photonic devices and communication systems by way of a chip-scale device integration technology. To this end, it is crucial to introduce and effectively combine advanced functional materials with innovative device architectures. The talk will present the recent efforts on the development of high-performance communication photonic devices such as electro-optical modulators and photodetectors.
报告人简介:
Dr. Ping Ma is currently a senior researcher and lecturer at Swiss Federal Institute of Technology Zurich (ETH Zurich), Switzerland. He received the Doctor of Science degree from ETH Zurich in 2012. He had a research stay at Oracle Labs in the USA, where he performed industrial research and product development on silicon photonics-based optical transceivers and interconnects. His current research focuses on the development of advanced functional materials and the enabled innovative devices for next-generation classical and quantum information and communication technologies, which is carried out in collaboration with both academic and industrial partners. He has authored more than forty scientific publications in peer-reviewed journals and conference proceedings, including research articles in Nature Nanotechnology and Nature Materials.
报告人:马小松,南京大学物理学院
时间:12月8日(周二)14:00
单位:江苏省物理学会
参会方式:蔻享直播
直播链接:https://www.koushare.com/lives/room/216584
摘要:
量子信息处理是基于量子物理的信息处理方式,它以空前高效的方式增强了通信安全和计算能力。量子光学为量子信息处理以及探索量子物理基本问题提供了一个理想的理论与实验平台。在这个报告里,我和大家一起探索量子光学的世界,介绍量子叠加,纠缠,量子态隐形传送与集成量子光学器件等概念与实验。
报告人简介:
南京大学物理学院教授,博士生导师。2010年毕业于奥地利维也纳大学物理系,获得博士学位。其后在维也纳大学进行博士后研究工作,致力于长距离量子通信实验。2012年入选“欧盟玛丽居里学者”人才支持计划,前往美国耶鲁大学进行集成量子光学芯片方向的研究。
报告人:肖熠博士,中科曙光异构算法研究员
时间:12月9日(周三)16:00
单位:中科院理论物理所
会议直播室:9000240612(需安装小鱼易连客户端)
会议直播链接:
http://live.xylink.com/live/v/9680cdaa761ee1d8017622a6bdcd19ec
摘要:
异构并行编程模型是目前超级计算机主要采用的并行编程模型,HIP是一种可以支持在不同加速器平台间进行切换显式异构并行编程模型。本次培训主要介绍HIP并行编程模型及并行程序设计方法,同时介绍并行计算基础、加速器硬件基本结构以及如何从将CUDA程序移植至HIP并行平台。
报告人简介:
肖熠,博士,中科曙光异构算法研究员,中国科学院计算技术研究所博士后。主要从事并行算法、高性能计算体系结构和深度学习方向研究。
6Searching for Topological Superconductor Candidates by Using Versatile Methods
报告人:郭艳峰,上海科技大学
时间:12月10日(周四)15:00
单位:中科院强耦合量子材料物理重点实验室、中国科大物理系、科研部
参会方式:蔻享直播
直播链接:https://www.koushare.com/lives/room/420505
摘要:
Topological superconductors have potential use for low decoherence topological quantum computation. However, well-recognized topological superconductors are rather few. Superconductors hosting nontrivial topological states have been proposed as topological superconductor candidates. In this talk, I would like to introduce our use of versatile techniques to search for such materials, including the high-pressure crystal growth of Nb2P5, pressing the topological nodal-line semimetal SrAs3 under high pressure to induce superconductivity, and ambient pressure crystal growth of TaSe3 and BaTi2Sb2O. These superconductors show different nontrivial topological states in their electronic band structures.
报告人简介:
上海科技大学物质科学与技术学院研究员、终身制序列助理教授、博导、课题组长,上海市高校东方学者特聘教授、浦江人才计划获得者。2008年硕博连读毕业于中科院物理研究所;2008年至2012年日本国立材料研究所(NIMS)博士后;2012年至2015年牛津大学物理系博士后;2015年加入上科大任现职。长期从事新量子物质材料探索、高品质单晶生长及物理性质研究,主要围绕拓扑材料、超导材料及新颖磁性材料开展研究。已在Nature子刊, PRL,JACS等学术期刊发表论文100多篇,总引用次数逾2200次。
7Prediction of Multifunctionality in Epitaxial AlN/ScN Superlattices
报告人:向红军,复旦大学
时间:12月10日(周四)10:00
单位:江苏省物理学会凝聚态物理与计算物理专业委员会
参会方式:蔻享直播
直播链接:https://www.koushare.com/lives/room/438156
摘要:
First-principles calculations are performed to investigate the effect of epitaxial strain on energetic, structural, electrical, electronic, and optical properties of 1 × 1 AlN/ScN superlattices. This system is predicted to adopt four different strain regions exhibiting different properties, including optimization of various physical responses such as piezoelectricity, electro-optic and elasto-optic coefficients, and elasticity. Varying the strain between these four different regions also allows the creation of an electrical polarization in a nominally paraelectric material, as a result of a softening of the lowest optical mode, and even the control of its magnitude up to a giant value. Furthermore, it results in an electronic band gap that cannot only change its nature (direct vs indirect), but also cover a wide range of the electromagnetic spectrum from the blue, through the violet and near ultraviolet, to the middle ultraviolet. Furthermore, we predict that epitaxial and initially nonpolar AlN/ScN superlattices are excellent energy storage materials with an ultrahigh energy density of up to 200 J/cm3 and an ideal 100% efficiency. These findings thus point out the potential of assembling two different materials inside the same heterostructure to design multifunctionality and striking phenomena.
报告人简介:
向红军,复旦大学物理系教授。1997-2006 年就读于中国科学技术大学,并获学士和博士学位,2006-2009 年在美国北卡州立大学和美国可再生能源国家实验室以博士后身份开展研究。向红军教授从事计算凝聚态物理研究,在多铁性物理模型建立和计算方法发展等方面取得了进展。代表成果有:提出了自旋序诱导铁电性的普适模型,突破了传统模型的局限,给出了一大类多铁的一般物理图像,已被领域专家认可。建立了计算磁相互作用及磁电耦合强度的四态法,该方法不仅已被诺贝尔奖获得者Albert Fert等30多个研究组采用,而且使他发展的多铁性普适模型具有定量预言能力。基于这些模型和方法,他解释了多铁材料中铁电性的来源,发现了新磁电耦合机制;设计了高性能多铁材料,部分预测已被实验证实。相关研究成果以第一/通讯作者身份发表在Phys. Rev. Lett., Nature Mater., Nature Comm., Phys. Rev. X等杂志上。共发表论文180多篇,其中Phys. Rev. Lett. 30篇。2014年起连续被爱思唯尔(Elsevier)评选为中国高被引学者。2018年获国家自然科学基金委杰出青年科学基金资助,获意大利国际理论物理中心ICTP奖。
8Exploring nanoscale ultrafast dynamical phenomena by 4D electron microscopy | 青促会物理论坛
报告人:付学文,南开大学
时间:12月11日(周五)9:00
单位:中科院物理所
地点:中国科学院物理研究所,M236会议室
摘要:
In the past decade, four-dimensional electron microscopy (4D EM), which enables the direct observation of transient morphologies, structures and carrier dynamics of materials in real time and space, has attracted increasing interest to the research community due to its powerful capability in the interdisciplines of physics, material science, chemistry, and biology. In this presentation, I will firstly give a brief introduction of the development of 4D-EM, several cutting-edge technologies, and the state-of-the-art of its applications. Then I will present our most recent development of two-color photon induced near field electron microscopy (PINEM) in 4D EM based on “photon gating” effect, which enhances the temporal resolution of 4D-EM by an order of magnitude. Such high temporal resolution enables visualizing the ultrafast electronic dynamics of a single nanostructure. Using this methodology, we reveal the nanoscale-femtosecond dielectric response of a single VO2 nanowire in the insulator-to-metal phase transition. After that, I will talk about our development of liquid-phase 4D EM and its first application in imaging Brownian dynamics and photochemical reaction dynamics of nanoparticles in liquid on the nanometer-nanosecond time scale. Both the translational and rotational dynamics of individual nanoparticles were imaged in both diffusion and ballistic regimes, and a full transition from diffusive to superdiffusive, and further to ballistic rotation was revealed with increasing the asymmetry of the particles. With increasing laser fluence, photoinduced photomorphic reaction dynamics such as agglomeration, coalescence, and fusion dynamics of plasmonic nanoparticles in liquid were directly unraveled. This advanced liquid-phase 4D EM opens a promising possibility for future study of numerous physical, chemical and biological dynamical processes in native environments. In the end, I will introduce the recent development of low-cost, laser-free 4D-EM and its application in visualization of electromagnetic wave propagation dynamics in high frequency miniature electronic devices at nanometer and picosecond scales, which extends the application of 4D EM to the field of electromagnetic dynamics in nanoscale electronic devices.
报告人简介:
付学文,南开大学物理科学学院教授,博士生导师,海外引进青年人才,天津市杰出青年基金获得者,南开大学“百名青年学科带头人”,国家重点研发计划青年项目首席科学家。2014年获北京大学凝聚态物理博士学位(导师:俞大鹏院士),曾荣获北京市优秀博士毕业生、北京大学优秀博士毕业生和优秀博士论文奖。先后在美国加州理工学院(诺贝尔奖得主Ahmed Zewail教授研究组)和美国布鲁克海文国家实验室 (Yimei Zhu教授研究组)从事研究工作。2019年受聘于南开大学物理科学学院担任教授、博导,牵头建立了南开大学超快电子显微镜实验室。长期从事4D超快电子显微镜、超快阴极荧光等超高时空分辨电子成像与探测技术开发及其在低维量子功能材料的结构、载流子及自旋等动力学中的应用研究。在Science、Science Advances(3篇)、Nature Communications、Advanced Materials、PNAS、ACS Nano(4篇)、Nano Letters等知名国际期刊发表学术论文近40篇,获授权发明专利1项。研究成果多次被 Science、Phys.org、Physicsword、Nanotechweb、Advances in Engineering等科学媒体选为研究亮点进行报道。
9Magnetic excitations in quantum-disordered FeSe and NaYbSe2 | 卡弗里理论科学研究所讲座
报告人:Prof. Xing-Ye Lu,BNU
时间:12月14日(下周一)14:00
单位:Kavli Institute for Theoretical Sciences,UCAS
地点:KITS Seminar Room, 4th floor, No. 7 Building, UCAS Zhong-Guan-Cun Campus
摘要:
FeSe is a special material among the families of iron-based superconductors because of its extended nematic phase and highly-tunable anisotropic superconductivity. Upon cooling, FeSe enters a paramagnetic orthorhombic (nematic) state below Ts~90K with no static antiferromagnetic order formed. In this talk, I will present our RIXS and neutron scattering results on the magnetic excitations in the nematic state of uniaxial-strain detwinned FeSe, and discuss their connection to the origin of the high-Tc superconductivity in iron-based superconductors.
After that, I would like to present our recent progress on a quantum-spin-liquid (QSL) candidate—NaYbSe2. Compared with previous QSL candidates hosting substantial structural and/or exchange-interaction disorder, triangular-lattice antiferromagnetic system NaYbSe2 is a better candidate for the realization of QSL physics. We use various experimental techniques including heat capacity, magnetic susceptibility, elastic and inelastic neutron scattering to show the ground state of NaYbSe2 is likely a spinon Fermi surface QSL with gapless deconfined excitations.
报告人简介:
鲁兴业,北京师范大学物理学系副研究员、博士生导师,2019年国家优秀青年科学基金获得者。2014年博士毕业于中国科学院物理研究所;毕业论文获得中国科学院优秀博士论文奖;2014年11月至2016年12月在美国莱斯大学和瑞士保罗谢勒研究所瑞士光源从事博士后研究,入选玛丽居里基金会资助的PSI Fellow(2015-2017)。2017年回国后到北京师范大学物理学系开展工作。主要研究方向为关联电子材料的中子散射和共振非弹性x射线散射(RIXS)研究,关注的体系包括铁基超导、铜基超导、铱氧化物、低维量子磁性材料等等 。已在Science、Nature子刊、PRL等学术期刊发表论文80余篇,总引用次数1900余次。
更多报告信息:中国物理学会期刊网学术讲座列表