高速超导磁悬浮列车、涌现拓扑现象、量子点激光器、量子计算及其应用、异构材料 | 本周直播物理讲座

报告人：赵勇，福建师范大学/西南交通大学

时间：8月25日（周二）10:00

单位：中科院物理所

参加方式：讲座以线上形式进行，采用“腾讯会议”软件

会议ID：731 563 959  

会议密码：0825

直播链接： 

https://meeting.tencent.com/s/1VXq86vhQzNw

https://meeting.tencent.com/l/Ho9AQlsPhxIj

摘要：

超导材料的强电应用涵盖了广阔的领域，高速磁浮列车就是其中重要的应用之一。我国幅员辽阔，人口众多，高速磁浮列车的应用在我国有着巨大的潜力。按照磁浮原理的不同，磁浮列车可以分为电磁吸引型、电动排斥型、以及超导量子磁悬浮型；按照磁浮关键材料的不同，亦可分为常导磁浮列车列、永磁磁浮列车、超导磁浮列车等类型。本讲座介绍了主要磁浮列车的基本原理、发展历史和现状、以及应用前景。其中就高速超导磁浮列车所涉及的物理、材料和电气技术等关键问题进行了特别的介绍。

报告人简介：

赵勇，本科和博士就读于中科大物理系，硕士就读于华中科大和中科院等离子体物理所。1988至1990年在浙江大学物理系任讲师和副教授；1990-2003年在新南威尔士大学材料学院任博士后、研究员、高级研究员和教授；2003年起在西南交大任首席教授、超导中心主任；2018年起在福建师大任教授。主要研究领域包括超导材料的制备技术、磁通钉扎特性、超导磁浮原理及应用。2004年获聘长江学者特聘教授，2005年获国家杰出青年基金。在JACS、PRB、APL等期刊发表论文200余篇，获国家发明专利授权60余项。

报告人：Dr. Xiaoran Liu, Rutgers University

时间：8月25日（周二）10:00

单位：中科院物理所

参加方式：讲座以线上形式进行，采用“腾讯会议”软件

会议ID：177 139 447  

会议密码：0825

直播链接： 

https://meeting.tencent.com/l/4o9thMHfnMZS

摘要：

The interplay between electron-electron correlations and strong spin-orbit coupling has lead to tremendous predictions for correlated topological states of matter. As the archetypal candidates for magnetic Weyl semimetal, the pyrochlore iridates have been proposed to host more exotic topological phases in their thin films, manifested as the emergence of zero-field Hall conductance induced by the Berry curvature of bands. In this talk, I will show combined experimental and theoretical evidences for the observation of these emergent topological states in high-quality (111) pyrochlore iridate thin films, where intrinsic anomalous Hall effect with extremely large coercivity is demonstrated on the low-temperature magnetic phase with the peculiar all-in-all-out antiferromagnetic ordering. The nontrivial band topology is revealed as a result of the surface state induced by the termination of the film. These results highlight the intrinsic bulk-surface correspondence of the Ir sublattice in pyrochlore and open new directions for novel correlated topological materials.

报告人简介：

Dr. Xiaoran Liu received his bachelor in materials science and engineering from Nanjing University. Then he went to University of Arkansas and got his PhD in Physics there. After that, he joined Rutgers University as a named postdoctoral fellow funded by the Gordon and Betty Moore foundation. Xiaoran Liu’s research interest is mainly in the design and fabrication of high-quality thin films and heterojunctions of novel quantum materials, where interesting electronic, magnetic, optical, and/or topological phenomena take place. In addition, he is also interested in studying novel bulk quantum materials by means of state-of-the-art characterization tools such as synchrotron/neutron-based techniques.

报告人：Huiyun Liu，University College London

时间：8月25日（周二）19:30

单位：中国科学院半导体研究所

参会方式：蔻享直播

直播链接：https://www.koushare.com/lives/room/314409

摘要：

Si is one of the most important semiconductor materials as it has been the mainstays for modern electronics. However, it is not widely used for light emitting sources because bulk Si is an inefficient emitter, a result of indirect bandgap. Direct epitaxial growth of III-V nanostructures on silicon substrates is one of the most promising candidates for realizing photonic devices on a silicon platform. The major issue of monolithic integration of III-V on Si is the formation of high-density threading dislocations. As a zero-dimensional material, quantum dots (QDs) have three-dimensional quantum confinements, which create delta-function like density of states. QD lasers have low threshold currents, temperature insensitive operation, and less sensitivity to threading dislocations for lasing operation and operating lifetime, which are the ideal candidate to form active region in III-V lasers grown on group IV substrates. Here, I will show the development roadmap from initial proposal from UCL group to the potential commercial applications.

报告人简介：

Huiyun Liu received his PhD from form Institute of Semiconductor, Chinese Academy of Sciences at November 2001. After receiving his PhD, he joined the EPSRC National Centre for III-V Technologies at Sheffield University. In 2007, he was awarded Royal Society University Research Fellow, and started his academic career by taking Senior Lecturer position in the Department of Electronic and Electrical Engineering at University College London with commissioning the first new Molecular Beam Epitaxy reactor and creating a new group. In 2012, he was promoted as Chair Professor of Semiconductor Photonics at University College London. His current research interest concentrates on the nanometre-scale engineering of low-dimensional semiconductor structures by using Molecular Beam Epitaxy and the development of novel optoelectronic devices including lasers, detectors, solar cells, and modulators. He co-authored more than 300 papers and hold on several patents on silicon photonics and quantum dot techology.

报告人：郭国平，中国科学技术大学

时间：8月26日（周三）19:30

单位：《半导体学报》

参会方式：蔻享直播

直播链接：https://www.koushare.com/lives/room/837107

摘要：

近来，量子计算受到国内外越来越广泛的关注，各大跨国公司如Google、IBM、Intel和BAT华为等公司都布局量子计算研制，各种量子软件和量子计算应用研究也是不断涌现。本报告将在简要介绍国内外量子计算软硬件主要进展的基础上，重点汇报一下我们近期在半导体和超导量子芯片，量子测控系统，量子软件和量子应用等方面的工作。

报告人简介：

郭国平，教授，博士生导师，本源量子创始人。中国科学技术大学微电子学院副院长、中科院量子信息重点实验室副主任。长期从事半导体量子计算实验研究，在量子比特编码、操控、扩展以及量子软件、量子算法等方面做出系列创新性研究成果。国家重点基础研究发展计划项目A类、国家重点研发计划首席科学家，作为负责人承担了国家自然科学基金委重点项目等多个科研任务。获国家杰出青年基金、第十四届“中国青年科技奖”、2018年安徽省自然科学一等奖，入选中组部“万人计划”科技创新领军人才，教育部青年长江学者等。

报告人：朱运田，香港城市大学

时间：8月28日（周五）14:30

单位：Frontiers of Physics编辑部

参会方式：蔻享直播

直播链接：https://www.koushare.com/lives/room/038932

Strong and tough materials are desired for light-weight applications such as electric cars and aerospace applications. Recently, heterostructures are found to produce unprecedented strength and ductility that are considered impossible from our textbook knowledge and materials history. Heterostructured materials consist of heterogeneous zones with dramatic (>100%) variations in mechanical and/or physical properties. The interaction in these hetero-zones produces a synergistic effect where the integrated property exceeds the prediction by the rule-of-mixtures. Importantly, heterostructured materials can be produced by current industrial facilities at large scale and low cost. There are many scientific issues with such materials that challenge the communities of experimental materials science and computational material mechanics. Heterostructured materials are quickly becoming a hot research field in the post-nanomaterials era. In this talk I will present the current advances as well as future challenges and issues in this emerging field.

更多报告信息：中国物理学会期刊网学术讲座列表