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报告人:Dr. Bo Fu,University of Hong Kong
时间:1月19日(周二)10:00
单位:中科院物理所
参会方式:腾讯会议
会议ID:313 233 964
会议密码:0119
会议链接:
摘要:
Recently, an intriguing magnetic-field driven crossover from positive to negative magnetoresistance (MR) has been observed in a variety of topological materials, where a notch-shaped longitudinal MR appears in the vicinity of the zero magnetic field and turns into a negative MR when the magnetic field exceeds some critical value. We first present a quantum interference theory for three dimensional Dirac materials. It reveals a striking crossover from positive to negative magnetoresistivity, uncovering strong competition between weak localization and weak antilocalization in multiple Cooperon channels at different chemical potentials. We then develop a quantum diffusive theory for massive Dirac materials in a finite uniform magnetic field. The quantum fluctuation of electromagnetic field still survives for massive Dirac fermion, and consequently, the quantum anomaly related longitudinal magnetoconductivity is found to be positive and quadratic in a magnetic field and decays quickly with the mass. Our work sheds light on the important role of spin-orbit coupling in the magneto-transport in in topological nontrivial and trivial Dirac materials.
报告人简介:
Dr. Bo Fu received his Ph.D. in condensed matter physics in 2017 under the supervision of Prof. Qunxiang Li and Prof. Qinwei Shi at the University of Science and Technology of China. Currently, he worked in Prof. Shunqing Shen’ group at the University of Hong Kong as a postdoctoral fellow. His research mainly focuses on magneto-transport theory in Dirac materials and intriguing phenomena in higher order topological insulators and superconductors.
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报告人:刘蕴,英特尔高性能计算解决方案架构师
时间:1月20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:
摘要:
英特尔oneAPI提供了一个异构计算的平台,通过SYCL的编程模型,实现同时对CPU,GPU,FPGA等硬件的支持。本报告将对oneAPI平台的特点和使用方法进行介绍。
报告人简介:
刘蕴,英特尔高性能计算解决方案架构师,服务于英特尔IAGS计算机性能及开发者产品部,数据中心生态系统工程部门。在英特尔公司负责与高性能计算领域的软件和应用的开发者合作,从事解决方案的设计和优化。在CPU指令集优化,基于傲腾持久化内存的解决方案落地等方面拥有丰富的经验。(Liu Yun, Intel HPC Solution Architect, working at IAGS/DEE (Datacenter Ecosystem Engineering). He is working with software developers and ISVs, to optimize the application with new HW or features. He is experienced in enabling CPU instructions and Optane persistent memory in the application.)
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报告人:Ying Li,Graduate School of CAEP
时间:1月19日(周二)10:00
单位:中国科学院计算技术研究所
参会方式:蔻享直播
会议链接:
摘要:
Computing is useful only if it produces correct outcomes. On a scalable quantum computer with millions of qubits, we can obtain the correct outcome by protecting information using error correction codes. In this talk, I will review quantum error correction, fault-tolerant quantum computation and present alternative approaches that can reduce computing errors without encoding. Using error extrapolation and quasi-probability decomposition, we can realise high-accuarcy computation on near-future quantum devices with a limited number of qubits.
报告人简介:
Ying Li, Associate Professor at Graduate School of CAEP, working on the theory of quantum computation, including fault tolerance, error mitigation, network architecture and algorithms. He obtained Bachelor and Master degrees at Nankai University in 2006 and 2009, respectively, and PhD degree at the National University of Singapore in 2013. Before he joined Graduate School of CAEP in 2017, he worked in the University of Oxford as a postdoctoral researcher for four years.
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报告人:何珂,清华大学物理系
时间:1月21日(周四)15:00
单位:合肥微尺度物质科学国家研究中心、国际功能材料量子设计中心、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
会议链接:
摘要:
量子反常霍尔效应是一种无需磁场的量子霍尔效应。它不但是量子霍尔效应相关拓扑量子现象得以实际应用的关键,还是探索手征拓扑超导电性、拓扑磁电效应等诸多拓扑量子物态和效应实现的基础。2012年底,此效应在磁性掺杂拓扑绝缘体薄膜中得以实验实现,然而量子化的反常霍尔电阻和无耗散输运只有在低于100 mK的极低温环境下才能实现,这严重影响了量子反常霍尔效应相关研究的进展和应用。最近几年一种内禀磁性拓扑绝缘体MnBi2Te4的发现为大幅提高量子反常霍尔效应实现温度带来了希望。在这个报告中,我将介绍量子反常霍尔效应的概念、人们通过过去几年的研究对磁性拓扑绝缘体中量子反常霍尔效应机制所获得的理解,以及为提高其实现温度所作的尝试。尤其我们将介绍最近人们在本征磁性拓扑绝缘体所取得的研究进展,以及如何基于这类材料获得高温量子反常霍尔效应。
报告人简介:
何珂,2000年于山东大学物理系获得理学学士学位。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。何珂的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研究。共发表学术论文50余篇,被引用5000余次。曾3次在美国物理学会年会做邀请报告。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)、日本仁科芳雄亚洲奖(2015)、叶企孙物理奖(2017)、国家自然科学一等奖(2018)等荣誉和奖励。
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