报告介绍 Abstract:　　Low temperature fuel cells are electrochemical devices that convert chemical energy directly to electricity. They have great potential for both stationary and transportation applications and are expected to help address the energy and environmental problems that have become prevalent in our society. Despite their great promise, commercialization has been hindered by lower than predicted...

报告介绍 报告摘要：　　科研行为大致可分为负责任的、不当的和不端的三类。科研诚信是负责任的科研行为最基本的和最重要的组成部分。近年来我国出现的许多学术不端问题，除了大环境的影响和研究者个人道德品质缺陷外，对于青年学生和研究人员也还存在不懂和不重视的问题。演讲者作为一些学术期刊的编委、国家基金委监督委员会成员、以及中国科协科技工作者道德与权益委员会委员，调查和处理过多个学术不端事件，其中有的广受公众关注。演讲者...

报告介绍 报告摘要： Spintronics is a field of general interest, which aims to utilize the spin degree freedom of electrons for novel information storage and logic devices. In this talk, I will discuss the spin dependent properties of graphene that make it a promising candidate material for spintronics. First part of my talk will answer the question: why graphene is a good spin channel material. I will presen...

报告介绍 Abstract:　　In this talk I will present our recent progress in scanning tunneling microscopy and spectroscopy investigations of emerging 2D materials beyond graphene, including topological insulators (TI) and transition metal dichalcogenides (TMDs). 　　The scientific interests of TI originate from its spin chiral topological surface state (TSS). However, it has been very difficult to create a...

报告介绍 Abstract:　　In monolayer haxagonal lattices, two inequivalent valleys appear in the Brillouin zone. With inversion symmetry breaking, we find chiral phonons with valley contrasting polarization and ionic magnetic moment. At valley centers, there is a three-fold rotational symmetry endowing phonons with a quantized pseudo angular momentum, which includes spin and orbital parts. From conservation of ...

报告介绍 报告摘要： Ever since its discovery the notion of Berry phase has permeated through all branches of physics. Over the past three decades it was gradually realized that the Berry phase of the electronic wave function can have a profound effect on material properties and is responsible for a spectrum of phenomena, such as polarization, orbital magnetism, various quantum, anomalous, or spin Hall effect...

报告介绍 Abstract: 　　Intrinsic spin-orbit coupling in graphene is relatively weak, some tens of micro eVs. On one hand, this is good, as the projected intrinsic spin relaxation is also slow, on the order of microseconds. On the other hand, a greater value for the spin-orbit interaction is desired for spin manipulation and spin-orbit induced phenomena, such as the spin Hall effect. In this talk I will revie...

报告介绍 Abstract:　　The deeper understanding of topology in physics has led to a new concept of physical objects - topologically ordered system. A topological insulator is an electronic material that has a band gap in its interior like an ordinary insulator but possesses conducting states on its edge or surface. The talk gives an overview about the emerging field of topological photonics and concerns the o...

报告介绍 报告摘要：　　磁和电是物质的两种基本性质，也是现代信息时代的物质基础。近年来，研究者一直在努力探索固体中磁性与电性的耦合和调控。寻找具有磁性与电性共存和耦合的材料体系，一方面有助于人们对凝聚态物理与材料物理的科学认识，另一方面对设计新型量子器件有着重要影响。　　本报告中将简要介绍我们最近的两个理论工作。第一部分是铁电场效应异质结。一般的铁电场效应可以显著地调节与之相连的氧化物的电阻，但对其磁性影响甚...

报告介绍 Abstract: 　　The oxidation of volatile organic compounds (VOCs) is one of the main reasons for the regional high ozone and PM2.5 concentrations in the atmosphere. Peroxy radicals (RO2) are important radical intermediates in the atmospheric oxidation of VOCs. It is usually assumed that the peroxy radicals will react with NOx and HO2/RO2 radicals. However, our recent preliminary studies find that the...

报告介绍 Abstract: 　　Particle formation process via gas-to-particle conversion (nucleation) within complex flow systems is critical for environmental aerosol generations, as well as in many industrial applications. The main concern is the entangled interaction of fluid dynamic and particle nucleation, where the later is highly sensitive to accurately predicting both thermal and chemical transports within t...

报告介绍 Abstract: 　　In this talk, I will briefly discuss the recent progress in engineering topological states in condensed matter systems, including honeycomb lattices and topological insulators. Some of the basic concepts about topological phases will be introduced. As concrete examples, I will mainly focus on several of our findings of various topological phases (quantum anomalous Hall effect, 2D topol...

报告介绍 报告摘要： Ultrashort intense x-ray pulses available from new XFEL and HHG light sources allows to employ ultrafast and non-linear processes in atoms and molecules for probing quantum coherence effects and electron correlations on core-to-valence transitions [1]. The strong x-ray field can sufficiently alter the vibronic dynamics in the system, which is reflected particularly in the significant chan...

报告介绍 报告摘要：　　Low-dimensional magnetic materials have been proposed as building blocks for many intriguing applications, ranging from spintronics to quantum information processing, due to their novel properties which do not present in their bulk counterparts. Many new features of low-dimensional magnetic materials, such as magnetic anisotropy (MA), magneto-optic Kerr effect (MOKE) and quantum anomal...

报告介绍 Abstract:　　Tailoring the properties of semiconductor and magnetic structures has been a driving force of information technology. The goal of combining ferromagnetism with semiconductors into a single material has been pursued by physicists and materials scientists for about five decades. A brief review of the history of the magnetic semiconductors will be given before presenting our recent results...

报告介绍 报告摘要： Quantum Hall liquid is the first definitive example of a state of matter which does not break any symmetry, and exhibits "topological order". In this talk I will give a elementary introduction of this fascinating state of matter including the theoretical frameworks we use to understand it.报告人简介：　　Professor Dung-Hai Lee received his B.S. degree from the National Tsinghua ...