报告介绍 报告摘要：　　Radiation damages to living tissue play an important role in DNA mutation. In addition to the primary ionizing and secondary particles damaging mechanism, molecular environment can also play important role. Here, we report two new ionization-fragmentation mechanisms which can only be happened in hydration/cluster system: (i) the intermolecular Coulombic decay (ICD) where one primary io...

报告介绍 Abstract：　　Electrical control of quantum bits could pave the way for scalable quantum computation. An acceptor spin qubit in Si, based on spin-3/2 holes, can be controlled by electrical means using a gate electrode, which offers fast one- and two-qubit rotations and long coherence times at certain sweet spots. The relaxation time T1, while allowing 105 operations, is the primary limiting factor [...

报告介绍 报告摘要：　　Symmetry, dimensionality, and interaction are crucial ingredients for phase transitions and quantum states of matter. As a prominent example, the integer quantum Hall effect (QHE) represents a topological phase generally regarded as characteristic for two-dimensional (2D) electronic systems, and its many aspects can be understood without invoking electron-electron interaction. The intr...

报告介绍 Abstract：　　Carbon-based metal-free materials have been attracting numerous interests for electrocatalysis due to various merits such as abundance, low cost, high conductivity and tunable molecular structures. However, to date, the electrochemical activities of these electrocatalysts are mainly attributed to different active dopants (e.g., N, B, P or S), leading to a common concept that heteroatom...

报告介绍 报告摘要：　　随着功能电子器件的微型化和集成化，人们对低维纳米薄膜材料的需求日益提升。与传统半导体和金属二元氧化物相比，含稀土元素的钙钛矿氧化物完全有可能成为未来磁、电、声子和光子学器件的理想材料之一。功能器件的集成离不开异质界面，而异质界面本身也是一种功能器件。复杂氧化物薄膜和超晶格在异质界面处表现出极其丰富的新颖物性，且对外场非常敏感，兼具深邃的物理内涵和广阔的应用前景。目前，对低维氧化物界面物...

报告介绍 报告简介：　　表面合成反应无溶剂参与，可以原位制备通过溶液合成难以获得的不溶性大尺寸共轭分子体系，并可以通过扫描探针显微技术进行单分子在位测量，获得共轭分子体系的本征性质。近十年来，利用表面合成反应构建低维纳米分子体系取得了重要进展，代表性工作如石墨烯纳米带等，发现了许多新奇的物理性质。报告人在开展有机合成方法学研究工作的基础上，结合有机化学相关理论，进一步开展了低维共轭分子体系的原位制备与性质研究...

报告介绍 Abstract: 　　Metal and semiconductor quantum dots (QDs) exhibit unique size and composition dependent optical properties. The key elements that determine their optical properties are localized surface plasmon resonance in metal  anoparticles and excitons in quantum dots. Particularly, we study plasmon-exciton interaction of single QDs near metal nanoparticles. When QDs are placed near Au ...

报告介绍 Abstract：　　The Danish research group has drilled several ice cores through the Greenland Ice Sheet.  The logistics and methods to drill will be presented.  From ice cores, it is possible to look into the past and gain knowledge on how the ice sheets reacted to changing climate.  This knowledge can be used to improve predictions of sea level rise in the future.  The Greenland a...

报告介绍 Abstract：　　This talk gives an introduction to sum-frequency spectroscopy that we have developed over the years.It is a nonlinear optical technique that can provide more (sometimes unique) information about materials than linear optical techniques. In particular, its applications to surfaces and interfaces have greatly expanded the scope of surface science research.A number of relevant examples in...

报告介绍 Abstract：　　The interaction of light and matter at the nanometer scale lies at the heart of quantum optics because it concerns elementary processes such as absorption or emission of a photon by an atom. Over the past decade, we have shown that direct coupling of a photon to a single two-level atom should be possible via tight focusing. However, because transitions in quantum emitters are typically...

报告介绍 Abstract:　　Indistinguishable nuclei call for applications of the nuclear spin hypothesis and the proper molecular symmetry (MS) groups. This has fascinating consequences for the quantum dynamics. I shall present three examples, from the familiar H2 molecule via a methyl group to boron rotors. Such molecular rotors with identical nuclei do not allow classical molecular dynamics simulations which st...

报告介绍 Abstract：　　We perform first-principles molecular dynamics (MD) simulations on liquid water and lithium based on Kohn-Sham density functional theory (KSDFT) and orbital-free density functional theory (OFDFT), respectively. Water is of the utmost importance for life and technology. However, a genuinely predictive ab initio model of water has eluded scientists. We demonstrate that a fully ab initio ...

报告介绍

报告介绍 报告摘要：　　拓扑电子物态是当前凝聚态及材料物理领域的重要关注焦点。声子晶体是具有宏观周期性结构的人工材料，其中的声子态或声波态也可具有异于寻常的拓扑性质。本报告主要介绍介绍两类拓扑声子晶体，即能谷声子晶体和外尓声子晶体，内容涉及能谷声子晶体中的能谷态的涡旋特性、拓扑相及拓扑相变、能谷边缘态及拓扑输运，以及外尓声子晶体中的Weyl点、费米弧表面态及其拓扑输运等。报告人简介：　　刘正猷，国家杰出青年基金获得...

报告介绍 Abstract：　　Perovskites include a family of functional materials with ABX3 structure. Barium titanite (BaTiO3) is a typical inorganic ferroelectric perovskite that possesses switchable spontaneous polarization. Ferroelectric polarizations are usually switched by electric field, but other forms of switching mechanisms have been demonstrated, such as flexoelectricity, pyroelectric effect, and change...

报告介绍 Abstract：　　Although the richness of spatial symmetries has led to a rapidly expanding inventory of possible topological crystalline (TC) phases of electrons, physical realizations have been slow to materialize due to the practical difficulty to ascertaining band topology in realistic calculations. Here, we integrate the recently established theory of symmetry indicators of band topology into firs...