极性半导体、太赫兹、异质结构、复杂体系

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1

报告人：阚二军，南京理工大学

时间：10月18日（周二）12:00

单位：江苏省物理学会

会议链接：

摘要：

二维极性半导体存在多种长程序，可以在自旋、电荷等多自由度上控制电子器件的输运性质，对于逻辑器件和信息存储技术的发展具有重要意义。在这其中，发展铁电、铁磁乃至磁电耦合半导体尤其重要。在本报告中，我们将介绍我们课题组最近在这类极性半导体中所取得的一些典型进展，探究其中的关键物理要素。

报告人简介：

阚二军，南京理工大学教授，博士生导师，半导体微纳结构与量子信息感知工信部重点实验室主任。先后获得国家杰出青年基金、国家优秀青年基金、江苏省杰出青年基金等项目支持。面向电子信息器件，长期从事极性半导体方面的研究，在新型铁电半导体、室温铁磁半导体机理和门压控制磁性的机制方面取得了系列原创成果，先后在Phys. Rev. Lett., J. Am. Chem. Soc等期刊上发表了SCI论文100余篇，SCI引用6000余次。

2

报告人：郭怀珂，犹他大学

时间：10月18日(周二) 14:00

单位：中科院理论物理所

地点：理论所南楼6620

Zoom Meeting：

Meeting ID: 830 3940 1647

Passcode: 760258

摘要：

Macroscopic dark matter, with the most prominent example of primordial black holes, lies at the high mass end of all dark matter candidates. In this talk, I will show that extreme mass ratio inspirals (EMRIs) are ideal systems in searches for light, in particular subsolar, compact macroscopic dark matter. I will also show that LIGO is able to detect a special class of non-standard EMRIs that we call mini-EMRIs. I will introduce the mini-EMRIs and show that they can be detected with techniques used in current searches of gravitational waves from isolated neutron stars at LIGO.

报告人简介：

郭怀珂，LIGO-Virgo-KAGRA科学合作组成员。2016年博士毕业于美国马萨诸塞大学阿默斯特分校，2016-2018年为中科院理论物理研究所博士后，2018-2021年为俄克拉荷马大学博士后，2021-2022年为犹他大学博士后。目前主要从事粒子物理唯象学、物质反物质不对称、暗物质以及相关的引力波的理论研究和在LIGO的实验探测工作。

3

报告人：Prof. Gilles TARJUS，Sorbonne Univ./CNRS, Paris

时间：10月18日（周二）15:00

单位：中科院理论物理所

Zoom Meeting ID：815 5224 3930

password：560729

Link：

摘要：

When cooled fast enough to avoid crystallization, a liquid becomes increasingly viscous and eventually forms a glass. This “glass transition”, one of the oldest unsolved problems in condensed-matter physics, has given rise to a wide diversity of views. The mean-field theory provides an elaborate and consistent picture of glasses and glass formation that is exact for liquids in the limit of infinite spatial dimensions. What, however, remains of this description in finite dimensions where spatial fluctuations generate mechanisms of all kinds that may alter the picture? I will review the issue and discuss possible strategies to make progress.

报告人简介：

Prof. Gilles TARJUS is the Head of the Statistical Physics group at the CNRS, LPTMC (Dept. of Condensed-Matter Theoretical Physics), Sorbonne University, Paris (France). Prof. Gilles TARJUS was appointed as a Research Charge at the CNRS, LPTMC in 1979, and then promoted to the Research Director in Paris in 1994. Before it, he worked as a Research fellow of Chemistry and Biochemistry, at UCLA, California (1987-1989) and was designated as an invited professor in 1996. He earned his doctoral degree in physics at the University of Pierre & Marie Curie (Paris VI) in 1980 and a diploma from Ecole Polytechnique (Parisi) in 1977. His work in the field of statistical physics and condensed-matter theory has been focused for the last 20 years on glassy and disordered systems. He has published more than 240 papers in peer-reviewed journals and has given 160 invited talks and seminars. He has been the advisor or co-advisor of 13 Ph.D. students and 8 post-docs.

4

报告人：李玉同，中国科学院物理研究所

时间：10月18日(周二) 20:00

主办：“天涯·致远” 物理大讲坛

会议链接：

摘要：

大能量高峰值功率太赫兹辐射源对于太赫兹科学研究和应用非常重要。最近，利用强激光和等离子体相互作用产生太赫兹辐射的研究引起了人们的关注。我们对强激光-固体靶相互作用产生太赫兹辐射的新途径进行了探索。发现强激光可以在固体薄膜靶中产生大量高能电子，当电子从靶背面逃逸到真空时，通过渡越辐射和鞘层辐射，可以激发了高强度太赫兹辐射。利用Vulcan超强皮秒激光装置，实验上获得了能量高达200 mJ的强太赫兹脉冲，这是迄今为止在实验室中获得的最高太赫兹能量。利用物理所的飞秒激光装置，也获得了峰值功率超过GW的强太赫兹源。利用该源，我们已经初步开展了强太赫兹场和物质非线性相互作用研究。

报告人简介：

李玉同，中国科学院物理研究所研究员、中科院光物理重点实验室主任。主要从事强激光和物质相互作用研究，在强激光驱动新型高功率太赫兹辐射及其应用、新型激光核聚变方案、实验室天体物理等前沿问题的研究中，取得了多项具有国际影响的进展。在国内外学术刊物发表SCI论文200余篇（其中10篇Phys Rev Lett，2篇Nature Physics），国际会议邀请报告60多次。获得国家杰出青年基金、中青年科技创新领军人才、万人计划和国家百千万人才工程、国务院特殊津贴专家、国家自然科学二等奖、中国科学院杰出成就奖、中国物理学会王淦昌物理奖、求是杰出科技成就集体奖、中国科学十大进展、蔡诗东等离子体物理杰出成就奖等奖项和荣誉。

5

报告人：Donna Strickland，2018年诺贝尔物理学奖得主

时间：10月18日(周二) 20:20

单位：北京交通大学，北京航空航天大学、北京物理学会

会议链接：

摘要：

本次报告将对啁啾脉冲放大技术进行介绍，在保证放大前后的激光脉冲宽度基本一致的前提下，将脉冲能量提高若干数量级，从而大幅度提高激光脉冲的峰值功率。该技术已经普遍应用于超短超强脉冲激光系统中，助推了强光与物质非线性相互作用的研究，也促进了激光眼科手术、手机玻璃微加工等新兴激光应用领域的发展。

6

报告人：崔晓玲，中国科学院物理研究所

时间：10月19日（周三）16:00

单位：清华大学高等研究院

会议链接：

摘要：

Quantum droplet describes a self-bound object that is stabilized by quantum effect. It has a long research history ever since the Kerson Huang's theoretical model in late 1950s and the intensive study of Helium nanodroplet in 1980s. In recent years, quantum droplet has regained great interest in ultracold gases thanks to its realization in both dipolar gases (since 2016) and in binary boson mixtures (2018). In this talk, I will discuss how to use ultracold droplets to engineer and simulate various interesting physical phenomena, including Borromean binding, droplet impact dynamics, and liquid-gas coexistence at zero temperature. While some of the phenomena are typically seen in our classical world, the ultracold droplets offer the opportunity to unveil intriguing quantum effects behind them and allow their explorations in a fully controlled quantum setting.

报告人简介：

Xiaoling Cui is a professor at the Institute of Physics(IoP), Chinese Academy of Sciences. She got B.S. degree from Shandong University in 2005 and Ph.D. from IoP in 2010. During 2010-2013, she worked as an associated member in the Institute for Advanced Study in Tsinghua University and a research associate in Ohio State University, and after that she joined IoP. Her research interest is to explore and bridge the few- and many-body physics in ultracold atoms and related fields.

7

报告人：陈育涵，北京师范大学系统科学学院

时间：10月20日(周四) 10:30

单位：中科院理论物理所

腾讯会议：554-309-888

会议密码：9703

会议链接：

摘要：

Complex brain systems span multiple levels. As a substrate for function, insight into the large-scale brain structures is crucial for fundamental and systems-level understanding of primate brains. In this talk, we will combine the findings from different computational models and various multi-modal neuroscience experimental datasets to explore the different balance mechanisms of structural connectome across various levels: 1) in the mesoscopic level, the balance between basic constraints of cost and efficiency shapes the structural brain connectome to form the important mesoscopic features; 2) in the important functional system level, the relationship between the structural connectome and energy metabolism reveals the underlying mechanism of balance of benefit and risk; 3) in the regional level, the large-scale primate brain connectome across different regions are revealed by biological rules; 4) During the evolution for mammalian brains, brain scaling is revealed by a dataset with various structural features in the gray matter and the white matter in over 100 mammal brains.

报告人简介：

Yuhan Chen received her BS in theoretical physics at the University of Science and Technology in China in 2006, and Ph.D. in Computational Neuroscience at Hong Kong Baptist University in 2013, where she also spent two years pursuing postdoctoral research. From 2015-2021, she worked as an assistant researcher at the state key laboratory of cognitive neuroscience and learning at Beijing Normal University. She is currently an assistant researcher in the School of Systems Sciences at Beijing Normal University since 2021. The focus of her laboratory is to understand the brain mechanisms of information processing and functional integration by building a cross-scale dynamic model with different brain regions. Meanwhile, she also National Brain Program Child Brain Development Program to investigate the mechanisms involved in the formation and evolution of baby connectomes through the combined application of computational models and multimodal connectome datasets. Yuhan Chen has published a series of publications in PNAS, Cerebral Cortex, PLoS Computational Biology, etc.

8

报告人：张云龙，中科院国家天文台

时间：10月20日（周四） 10:30

单位：中科院理论物理所

地点：理论所南楼6420

Meeting ID: 837 2279 4090

Passcode: 222234

Zoom会议：‍‍‍‍‍‍‍‍‍‍‍‍‍

摘要：

We explore the possibility of detecting entangled photon pairs from two patches of the sky, such as cosmic microwave background or other cosmological sources. The measurements use two detectors with different photon polarizer directions. When two photon sources are separated by a large angle, a null test of unentangled photons can be performed. The deviation from this unentangled background is the signature of photon entanglement. To confirm whether the deviation is consistent with entangled photons, we derive the photon polarization correlation to compare with, similar to that in a Bell inequality measurement. Besides, with the use of holographic Schwinger–Keldysh correlators, we construct the CHSH (Clauser–Horne–Shimony–Holt) form of Bell inequality, and find that its violation can also be implemented in the holographic model of EPR (Einstein–Podolsky–Rosen) pair.

报告人简介：

张云龙，中科院国家天文台副研究员。2014年中科院理论物理所获理学博士，先后在台湾大学、韩国亚太理论物理中心APCTP进行博士后研究。2018年起任日本京都大学JSPS学者、Yukawa基础物理研究所特任助理教授，2020年底入职中科院国家天文台。研究领域为引力理论和宇宙学，包括黑洞物理和引力全息应用、超轻暗物质和引力波探测等。

9

报告人：徐军，清华大学

时间：10月20日（周四） 15:00

单位：中科院理论物理所

地点：北楼322会议室

摘要：

成核是结晶的关键步骤，其研究困难重重。基于随机成核假设，建立了稀释体系成核动力学和临界核尺寸的定量方程，测定了聚合物结晶的次级临界核尺寸，挑战了传统的Hoffman-Lauritzen理论。半晶固体的长时间应力松弛不能用常见模型来描述，发现其松弛单元尺寸随应力下降而不断增大，建立了新的应力松弛动力学方程。开发了基于酚-氨基甲酸酯新型可逆键的动态共价交联聚合物，研究了其分子设计测量和动态网络重排动力学的调控。设计合成了既具有动态自修复性能而且具有紫外光表面接枝和自交联特性的多功能动态共价交联材料，展示了该材料在柔性电子领域的应用。

报告人简介：

徐军，博士，长聘副教授，博士生导师。1997 年清华大学化工系本科毕业，2002 年清华大学化工系博士毕业。2002 年毕业后留在清华大学化工系工作，聘为助理研究员。2006 年晋升为副教授。2011年到德国弗莱堡大学物理系Günter Reiter教授研究组进行洪堡学者访问研究。主要研究兴趣包括高分子结晶、生物降解高分子、动态共价高分子等。先后承担国家自然科学基金项目、中德国际合作项目、和美国宝洁等公司多项国际合作项目以及和国内企业的横向合作项目等。2011年入选洪堡学者，2012年入选教育部“新世纪优秀人才”，同年获得冯新德高分子奖（Polymer 刊物年度中国最佳文章提名）。理论和实验相结合，揭示了环带球晶的形成机理，测得了几种高分子结晶的次级临界核尺寸。生物降解聚二元酸二元醇酯研究成果在企业实现了万吨级产业化和广泛应用。

10

报告人：Markus A. Huber，University of Regensburg

时间：10月20日（周四） 15:00

单位：中国科学院物理研究所

会议链接：

Zoom：897 5032 2416

Passcode: 363647

摘要：

Advancements in electronics, quantum technology and nanoscience require a nanoscopic understanding of the internal processes in custom-tailored quantum materials. Since the elementary building blocks of condensed matter are in constant motion, still images are not enough.

In this talk, I will show how femtosecond terahertz nanoscopy unravels the dynamics of photoexcited charge carriers in custom-tailored van der Waals (vdW) heterostructures. I will introduce a novel polarization nanoscopy technique to trace charge carrier dynamics in conducting and non-conducting materials. We demonstrate ~40 nm spatial and sub-cycle temporal resolution and non-invasively probe the interlayer tunneling across an atomically sharp WSe2/WS2 interface. We see pronounced variations in the formation and annihilation of optically bright and dark excited states as a result of nanoscale strain and changes in atomic registry. Our results demonstrate that ultrafast nanoscopy is an indispensable tool to study intrinsically disordered materials like vdW heterostructures.

On a WSe2 homobilayer, we precisely tune the density of excitons by photodoping and observe the transition of a gas of strongly bound excitons into an electron-hole plasma. By revealing this excitonic Mott transition on the nanoscale, we circumvent averaging over nanoscale inhomogeneities and extract the true nature of the process. We find a continuous transition with spatial variations not correlated with topography. Our results indicate that the exciton binding energy can be modulated on length scales inaccessible to other ultrafast non-contact probes. We foresee that the technique could resolve the interplay between excitons and a broad variety of quantum phases in real space.

As an outlook, I will shortly discuss recent breakthroughs in lightwave scanning tunneling microscopy and how ultrafast multi-messenger scanning probe microscopy could be achieved. This novel approach could soon allow us to tailor (bio)chemical reactions or ultrafast phase transitions, on their intrinsic atomic-scale spatial and fs-temporal scales.

报告人简介：

Dr. Markus A. Huber has studied physics at the University of Regensburg (Germany) and University of Colorado at Boulder (USA). In his studies, he focused on ultrafast near-field microscopy to study atomic and electron dynamics on the nanometer length scale. After his Ph.D., Dr. Huber joined Tony Heinz’s group at Stanford university to learn more about atomically thin materials. Recently, Dr. Huber has obtained a staff scientist position in Regensburg, continuing his work on nanoscopy, especially on 2D systems, as a team leader.

11

报告人：于涛，华中科技大学

时间：10月20日（周四）20:00

单位：中国人民大学物理学系

会议链接：

摘要：

近年来我们系统研究了磁子、表面声子、电子、光子和量子比特等元激发之间的手征相互作用。这种手性相互作用使得一种准粒子只能和某个方向传播的另一种准粒子相互作用，从而能够将准粒子进行单方向的激发，进而导致诸如手性自旋和声子泵浦、非接触自旋泵浦、手性自旋塞贝克效应、磁子的趋肤效应、磁子陷阱、磁子多普勒效应和自旋二极管效应等新现象。低温时，磁子的近场磁场和超导体可以通过迈斯纳效应实现强耦合，从而可以解决磁子难以像电子那样电控的难题，可以用来实现点接触、一维通道、低耗散等方式有效操控磁子的输运。在手征耦合磁体阵列中，我们在国际上较早预言了实现非厄米趋肤效应的条件，这使得利用调控耗散来实现磁子积累以及高灵敏探测微波磁场成为可能。

报告人简介：

于涛，现任华中科技大学物理学院教授，博士生导师，马普所物质结构和动力学研究所客座研究员。2018年获中国科技大学博士学位。之后在荷兰代尔夫特理工大学、日本东北大学和德国马普所物质结构和动力学研究所进行博士后研究工作。2021年加入华中科技大学任教授。长期专注于研究磁性理论，自旋电子学理论，量子输运理论，非常规超导电性理论，和光与物质强相互作用等。

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