1
报告人：Dr. Alfred Zong，UC Berkeley
时间：12月30日（周三）14:00
单位：中科院物理所
参会方式：腾讯会议
会议ID：914 238 532
会议密码：1230
会议链接：https://meeting.tencent.com/l/IFnefst2wlgO
摘要：
When electrons in a solid are excited by light, they can alter the free energy landscape and access phases of matter that are out of reach in thermal equilibrium. This accessibility is often enabled by the presence of phase competition, when one state of matter is preferred over another by only a small energy scale that, in principle, is surmountable by the excitation. To this end, we studied light-induced phase transitions in two different charge density waves (CDWs), which serve as model systems for other broken-symmetry states. First, using time-resolved photoemission and electron diffraction, we investigated the rare-earth tritelluride family, where only a unidirectional CDW exists at high temperature. After the suppression of this original CDW by photoexcitation, a different, competing CDW along the perpendicular direction appears, which has no equilibrium counterpart. Second, I will discuss how a single pulse of light can generate or erase competing CDW domains in 1T-TaS2. A peculiar photoinduced domain wall emerges as a result, which may host a novel density modulation in addition to the equilibrium CDW. Our findings provide a framework for understanding the interplay between competing orders and for unleashing novel states of matter that are “trapped” under thermal equilibrium.
报告人简介：
Alfred Zong completed his Bachelor in Physics and Master in Computer Science at Stanford University, during which he studied cuprate superconductors with photoemission under the guidance of Zhi-Xun Shen. He moved on to MIT to conduct his PhD research in the group of Nuh Gedik, where he investigated photoinduced phase transitions and metastable orders using a number of advanced ultrafast techniques. He is currently a Miller research fellow at UC Berkeley, examining electron and spin dynamics in solids with attosecond spectroscopy and diffraction.
2
新年悟理”2021跨年科学演讲——什么是相对论
报告人：曹则贤，中国科学院物理研究所
时间：12月30日（周三）19:00
单位：中国科学院科学传播局、中国科学院物理研究所、长三角物理研究中心(中国溧阳)
参会方式：蔻享直播
会议链接：https://www.koushare.com/lives/room/057781
摘要：
相对论的发展是一个长达300余年的过程，一部相对论史就是一部近代欧洲的数学物理思想史。狭义/广义相对论是和量子力学差不多同时发展起来的，爱因斯坦、普朗克、外尔、狄拉克、泡利等人都是同时思考相对论与量子力学问题的。在精神上，相对论和热力学相通，都是从原理出发去构建恰当的物理理论。相对论的发展在爱因斯坦1915年写出引力场方程那一刻达到了顶峰。相对论是纯粹理性思维的胜利，是物理现实的内在和谐与数学表达的形式美学之间完美的相互激励，是严谨的日耳曼文化同浪漫的拉丁文化相结合的产物。物理规律的变换不换性是相对论的核心思想。沿着朴素相对论、伽利略相对论经由狭义相对论抵达广义相对论，这一条绵密的思想河流上有最激动人心的关于物理学创造的历史画卷。
正如爱因斯坦向列维齐维塔抱怨的那样，鲜少有人以独立、批评的眼光关切相对论的细节。本次跨年科学演讲，主讲人曹则贤研究员将认真呈现相对论之历史的、哲学的、数学的和物理的含义，充分讨论相对论构造的细节。
报告人简介：
曹则贤，男，1966年生，1987年毕业于中国科学技术大学物理系，1997年在德国Kaiserslautern大学获物理学博士学位，1998年加入中国科学院物理研究所至今，现为中国科学院物理研究所研究员，同时是中国科学技术大学、中国科学院大学、清华大学等校授课教师；曾在Science、APL、PNAS、PRL、Adv. Mat.、Nature子刊等国际杂志上发表研究论文百余篇，另发表中文物理学、材料学教育论文近两百篇，编、译、著有《物理学咬文嚼字》 (四卷)《至美无相》《Thin Film Growth》《一念非凡》《惊艳一击》《量子力学-少年版》《相对论-少年版》《云端脚下》等专著多部。
3
Quantum Computation and Quantum Simulation with Trapped Ions
报告人：Kihwan Kim，Tsinghua University
时间：12月30日（周三）15:10
单位：北京大学物理学院
地点：物理楼中楼212
摘要：
In this lecture, I will discuss how to use trapped ions for quantum information processing including quantum computation/simulation. The trapped ion system is one of the leading candidates for the practical quantum computer/simulator and nowadays many companies such asIonQ, Honeywell, Alpine Quantum Computer and so on, has been involved in developing their quantum computer with trapped ions. Here I will begin the lecture by introducing various type of ion traps mainly in Paul trap, then discuss the basic process of quantum computation as initialization, quantum gates, and detections. I will also bring out the difficulties and problems with current technology and discuss the technical and theoretical developments to address them. Finally, I will provide the outlook for the large scale quantum computation with trapped ions in near future, mostly related to the perspective of NISQ (noisy-intermediate scale quantum computing).
报告人简介：
Prof. Kihwan Kim is a tenured associate professor in Tsinghua University. He received his Bachelor, Master and Ph. D from Seoul National University. He then did his postdoctoral work at Innsbruck University and the University of Maryland. He has been pursuing the development of quantum computation and quantum information science with trapped ions since he joined Tsinghua at 2011. Prof. Kihwan Kim and his group has already demonstrated the potential and ability of trapped-ion system. In particular, the longest coherence time of a single qubit in the world has been reported from his group. Recently, the experimental research of global entangling gates on arbitrary ion-qubits, which was published to Nature. He also raised many talented students and already over 10 students received the Ph. D under his supervision.
报告人：徐顺，中国科学院计算机网络信息中心，
时间：12月30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）
摘要：
本报告重点介绍分子动力学模拟软件eMD在GPU异构计算中的算法设计与程序优化。
报告人简介：
徐顺，中国科学院计算机网络信息中心副研究员，CCF高性能计算专委委员。2012年毕业于华南理工大学，获计算机应用技术博士学位；2008年11月-2010年5月在亚太理论物理中心（APCTP，韩国浦项科技大学）访问学习；2015年7月中国科学院大学凝聚态物理学博士后出站。2015年8月起在中国科学院计算机网络信息中心高性能计算部（暨中国科学院计算科学应用研究中心）工作，主要研究科学计算软件并行优化和大规模分子模拟应用，开发了eMD分子模拟软件；主持或参与了科技部“国家重点研发计划”高性能计算专项、中国科学院“十三五”科研信息化工程和中国科学院-英特尔并行计算中心等课题项目。
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