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报告人：Tatsuya Miki，Saitama University
时间：10月14日（周二）10:00
单位：Asian-Pacific Condensed Matter Physics (CMP) seminars
链接：
摘要：
Chiral materials have attracted significant attention for their unique electronic phenomena, such as cross-correlation responses, chirality-induced spin selectivity (CISS), and circular dichroism. To understand and control the material chirality, it is important to consider the quantitative measure that can continuously characterize the chirality of electrons, going beyond the binary distinction of “left” and “right” . Recently, electron chirality, based on relativistic quantum theory, has been proposed as a quantitative measure of chirality. However, it is still unclear which physical parameters in solids control electron chirality and how this connects to the experimentally observable quantity.
In this talk, we will present the results of quantitative evaluations of the electron chirality using first-principles calculations. The electron chirality exhibits rapid sign changes with respect to the chemical potential, indicating the possibility of controlling right- and left-handed electrons through the small chemical potential shift, such as electron or hole doping. Furthermore, we will demonstrate that electron chirality can be observed experimentally by using circularly polarized light in photoelectron spectroscopy. Finally, to gain clearer insight into the origin of electron chirality, we also study simplified atomic models with chiral crystal fields and will present the results of this analysis.
报告人简介：
Tatsuya Miki is a Specially Appointed Researcher at the Institute for Materials Research, Tohoku University. His research focuses on the theoretical and computational study of strongly correlated electron systems and emergent quantum phenomena in condensed matter physics.
He received his Ph.D. in Physics from Saitama University in 2025, where he also earned his M.Sc. in 2023 and B.Sc. in 2021. During his doctoral studies, he was awarded the prestigious JSPS Research Fellowship for Young Scientists (DC1), recognizing his outstanding potential as an early-career researcher. He joined the Institute for Materials Research at Tohoku University in 2025.
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报告人：Maja Colautti，National Institute of Optics，CNR-INO
时间：10月14日（周二）16:00
单位：清华大学物理系
地点：物理楼W105
摘要：
The generation and manipulation of quantum states of light is required for key applications, such as photonic quantum simulation, linear optical quantum computing, quantum communication protocols, and quantum metrology. In this context, I will present our recent advancements in using single organic molecules at cryogenic temperature as bright and stable sources of coherent single photons in the solid state. In particular, I will focus on our results on two-photon interference (TPI) experiments performed between distinct molecules on the same chip, and our recent insights on how to mitigate the practical limitations on the TPI among distinct emitters via the control of the electrical environment at the nanoscale. Indeed, we recently provided experimental demonstration of a hybrid tuning method for controlling the frequency of quantum emitters and at the same time to reduce the emitter sensitivity to charge noise, controlling spectral fluctuations . This successful strategy is based on the combined use of the electric field generated by electrodes and of optically excited long-lived charge states, which provide two efficient knobs for enhanced control of single-molecule emitters for quantum photonic experiment.
Dibenzoterrylene-doped nanocrystals of anthracene are dispersed on a glass substrate, nanostructured with 4 μm gap interdigitated gold electrodes. A combination of optical pumping and electrodegenerated electric field is implemented (electrically guided optical Stark shift: EGOSS), yielding a high degree of control on the local applied field with high spatial resolution and out-of-plane orientation. This allows for a reduction of spectral fluctuation (by a factor of 12) for a given frequency shift, with respect to the case of an in-plane-only electric field manipulation. In this way, the emission frequencies of single molecules can be tuned without degrading their spectral stability.
报告人简介：
Maja Colautti did her PhD in atomic and molecular photonics at the European Laboratory for Non-Linear Spectroscopy (LENS) in Florence, from 2016 to 2020, during which she developed hybrid strategies to efficiently integrate organic quantum emitters on chip. In 2021 she was visiting PostDoc Researcher at the Technical University of Denmark and at the Niels Bohr Institute in Copenhagen. During this period, she also worked for the Sparrow Quantum start-up developing quantum dot based devices for quantum technologies applications. Currently, she is a fixed term researcher at the National Institute of Optics in Florence, focusing her research on organic quantum emitters and hybrid nanophotonic strategies for diverse quantum applications.
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报告人：李贵新，南方科技大学
时间：10月15日（周三）15:10
单位：北京大学物理学院
地点：物理学院中212教室
摘要：
非线性光学超构表面是一类由空间变化的功能基元组成的超薄非线性光学器件。通过合理选择超构功能基元的材料组成、空间对称性，人们可以在亚波长尺度上对超构表面上产生的谐波进行多维度光场调控。通过构建具有旋转对称性的等离激元超构单元，可连续改变人工结构材料中非线性极化率的几何相位，进而对超构表面上产生的谐波、太赫兹波的振幅、偏振、波前进行调控。此外，将光学几何相位的概念推广到传统非线性光学晶体研究中，为控制谐波产生过程中的光自旋-轨道相互作用研究提供了新的视角。
报告人简介：
李贵新，南方科技大学工学院材料科学与工程系、精密光学工程中心教授，2023年度美国光学学会会士、求是科技基金会2019年杰出青年学者奖获得者。主要研究领域：光学超构表面、非线性光场调控、几何相位，研究工作曾多次被《自然-光子学》、《自然-纳米技术》、《自然-物理》作为亮点报道。担任OpticsExpress副编辑。
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报告人：Nobuo Hinohara，University of Tsukuba, Japan
时间：10月16日（周四）15:00
单位：中国科学院理论物理研究所
地点：南楼6520
摘要：
The quasiparticle random-phase approximation (QRPA) is a widely used framework for describing nuclear collective excitations, such as giant resonances and low-energy modes, within the mean-field or density functional theory (DFT). However, the construction and diagonalization of the QRPA matrix in the two-quasiparticle basis can be computationally demanding, especially when nuclear deformation is taken into account.
To address this challenge, the finite-amplitude method (FAM) has been proposed as an efficient approach to solve the QRPA equations within the time-dependent DFT framework. In this talk, I will present an overview of the FAM, with an emphasis on its implementation in existing DFT codes. I will also discuss its extensions to various QRPA applications, including low-energy collective excitations, zero-energy modes, and the QRPA sum rule.
报告人简介：
Dr. Nobuo Hinohara is an Assistant Professor at the Center for Computational Sciences, University of Tsukuba. He earned his Doctor of Science in Physics from Kyoto University, specializing in nuclear large-amplitude collective motion. He previously held research positions at RIKEN, the University of North Carolina, and the University of Tennessee, and was a visiting scholar at Michigan State University. His research focuses on nuclear structure theory, including nuclear density functional theory.
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报告人：李征征，北京大学
时间：10月16日（周四）15:50
单位：中国科学院理论物理研究所
地点：南楼6520
摘要：
Beta-decay half-lives set the time scale of the rapid neutron capture process (r-process), and therefore determine the production of the heavy elements in the universe. Currently, the data required by r-process mainly relies on theoretical calculations. The most commonly used model for beta-decay half-lives is proton-neutron quasiparticle random phase approximation (pnQRPA), which becomes numerically prohibitive in deformed nuclei. The implementation of finite amplitude method to pnQRPA enables its application for all nuclei without additional approximation. In this work, the pnQRPA based on the deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc) is developed by implementing finite amplitude method. The deformation effects and isoscalar pairing effects on the low-lying Gamow-Teller transitions are discussed, and their influences on beta-decay half-lives are studied.
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报告人：孙磊，西湖大学理学院
时间：10月17日（周五）16:00
单位：中国科学技术大学精准智能化学重点实验室
链接：
摘要：
分子量子比特框架（MQF）材料将稳定自由基集成于金属有机框架或共价有机框架中，可通过对框架材料的结构构建来设计自由基所处的声子和电磁环境，实现对其电子自旋动力学性质的精准调控，有望实现化学特异性量子传感、光量子存储等量子信息应用。本研究利用半醌式自由基构建一系列MQF材料，利用脉冲电子顺磁共振（EPR）波谱探索其自旋动力学性质的构效关系，提出增强结构刚性和降低自旋浓度的设计原则，将室温自旋弛豫时间和退相干时间分别提升至超过300 μs和5 μs。在手性MQF中观测到反常自旋弛豫现象，基于磁场和客体分子对该现象的调控，提出手性结构导致非对称自旋-声子耦合，发现了一种新型准粒子—自旋-声子极化子，并探索了其在加速量子比特初始化效率方面的应用。以上述MQF材料为量子探针，利用弛豫测试法和超精细光谱法，在室温溶液相实现了对微观粘度和核自旋的量子传感，并通过对脉冲序列及其相循环方法的设计实现了量子相干性提升和量子传感性能优化。
报告人简介：
孙磊，吉林长春人。本科就读于南京大学化学化工学院，2011年获得学士学位。随后加入麻省理工学院化学系Mircea Dincă课题组，于2017年获得无机化学博士学位。2017‒2019年和2019‒2021年先后在美国西北大学化学系Danna E. Freedman教授和阿贡国家实验室纳米材料中心Tijana Rajh高级研究员的指导下从事博士后研究。2019‒2022年于佐治亚理工学院计算学院攻读机器学习，获得计算机科学硕士学位。2021年11月加入西湖大学理学院，兼任化学系和物理系助理教授，组建分子量子器件和量子信息实验室。
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报告人：Leonardo Lessa，Perimeter Institute for Theoretical Physics
时间：10月17日（周五）9:00
单位：新加坡国立大学理学院物理系
链接：
摘要：
Symmetries and their anomalies are among the most powerful non-perturbative tools to characterize quantum many-body systems. Traditionally however, they have been limited to isolated systems, described by pure states. In this talk, we discuss how symmetries are a powerful constraint even when interactions with the environment are present. First, we show that topological order can survive as a long-range-entangled phase of matter even for mixed states. Crucially, this phase is characterized by emergent 1-form anomalous symmetries. Second, we address 0-form anomalies, which can appear at the boundary of SPT phases. There, we prove that strongly symmetric anomalous states exhibit long-range multipartite entanglement. Curiously, we find anomalous states possessing tripartite entanglement but no bipartite entanglement, an intrinsic feature of mixed states. Finally, if time permits, we discuss (non-anomalous) on-site symmetries. There, we find that thermal states with strong symmetries or superselection rules are generically entangled, which confirms previous results on specific symmetries and Hamiltonians.
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