报告介绍 Abstract： In this talk, I will summarize the recent research on synthesis, characterization and applications of two-dimensional nanomaterials in my group. I will introduce the synthesis and characterization of novel low-dimensional nanomaterials, such as graphene-based composites including the first-time synthesized hexagonal-close packed (hcp) Au nanosheets (AuSSs) on graphene oxide, surface-...

报告介绍 Abstract： 　　Motivated by the problem of time optimal control of two level quantum systems, we investigate the role of symmetries in general time-optimal control problems. If a symmetry is present the underlying (reduced) orbit space where the geodesics are studied is not simply a manifold but it has a reduced dimension and the structure of a stratified space. We study the relationship betwee...

报告介绍 报告摘要： 宇宙射线成因核素41Ca（半衰期约十万年）作为年代计和示踪剂在考古学、生物医学和地质学等许多领域都具有十分重要的科学意义和实用价值。然而，由于自然界里的41Ca含量极其低，目前还不能够实现对其进行准确测量。在各种高灵敏的分析手段中，加速器质谱（AMS）是最有可能实现自然界41Ca准确测量的分析手段之一。报告内容包括：AMS原理介绍、国内外发展现状、41Ca应用的意义以及AMS对41Ca测量存在的关键问题和挑战等。报告...

报告介绍 Abstract：　　In this talk, we first highlight issues with orbital related theory in predicting molecular reactivity. Conceptual density functional theory is then introduced next, whose strength and weakness are both showcased. The main purpose of this talk is to introduce to the audience a new recent effort to appreciate and entertain molecular reactivity using simple density functionals, which is ...

报告介绍 Abstract： Solar energy conversion, particularly solar-driven chemical fuel formation, has been intensely studied in the past decade as a potential approach for renewable energy generation. Efficient solar-to-fuel conversion requires artificial photosynthetic systems with strong light absorption, long-lived charge separation and efficient catalysis. Colloidal quantum confined nanoheterostructures ha...

报告介绍 Abstract： Here, I will present our systematic investigation of a K–O2 battery that uses K+ ions to capture superoxide (O2-) to form the thermodynamically stable KO2 product. This allows for the battery to operate through the facile one-electron redox process of O2/ O2-. Without the use of catalysts, the battery shows a low discharge/charge potential gap of less than 50 mV at a modest current ...

报告介绍 Abstract： 　　This talk will focus on a special class of functional polymers, made up from polymerization of ionic liquids (ILs). They are commonly termed poly(ionic liquid)s or polymerized ionic liquids (PILs). In such a structure configuration, some unique properties of ILs are incorporated into the macromolecular architecture. This inno...

报告介绍 报告摘要： 　　量子材料不仅包括拓扑材料、二维材料还包括异质结、超晶格等人工材料，是目前材料科学发展的热点和前沿。在这些量子材料中人们发现了许多新奇的量子效应，它们在国防、信息、能源和化工等领域有极其重要的应用前景。我将介绍如何通过异质外延方法来制备自然界中不存在的几种量子材料，包括锡烯、人工拓扑超导材料和界面超导材料等。并用原位的表征方法对这些材料进行了研究，发现了Majorana费米子存在的证据和10...

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报告介绍 报告摘要： Conformal and oriented metal-organic frameworks (MOF) thin film enclosing arbitrary nanostructures (substrates, nanowires, nanocrystals) are fabricated with precisely controlled thickness and pristine interface. This is achieved by atomic layer deposition of aluminum oxide on the substrates and addition of a tetra-topic porphyrin based linker, 4,4',4'',4'''-(porphyrin-5,10,15,20-tetrayl)-...

报告介绍 Abstract： While Kohn-Sham density functional theory (KS-DFT) has been extremely successful and is now widely used in the studies of molecules and condensed matter it has several shortcomings. This is mainly due to the self-interaction error (SIE) inherent in practical implementations of the method. This, for example, makes the description of energy levels in semi-conductors, localized defect states...

报告介绍 Abstract： Engineering solid state quantum systems is one of the grand challenges in the 21st century. In this talk I will review several approaches to controllably manipulate and engineer single emitters in wide bandgap semiconductors – promising qubits for scalable nanophotonics. In the first part of my talk I will show self-assembly methods to couple luminescence from single quantum emitter...

报告介绍 Abstract： I will discuss two examples of magneto-optical transport properties in gapped Dirac materials, focusing on 2D transition-metal dichalcogenides (TMD) and topological insulators (TI). First we will talk about the use of Faraday effect to measure the intrinsic spin fluctuations and how this facilitates the extraction of spin relaxation time in 2D TMD. It is shown that spin noise measurement ...

报告介绍 Abstract： The combination of density functional theory (DFT) for describing electronic structure and rate theory for obtaining the mechanism and rate of atomic scale transitions provides a powerful tool that can help with interpretation of experimental measurements and even prediction of the properties of new materials and chemicals.  Several applications of this methodology in the study of su...

报告介绍 报告人简介：　　麻生明，有机化学家，浙江东阳人，现任浙江大学理学部主任、长江特聘教授，中国科学院上海有机化学研究所研究员，2014年加入复旦大学化学系。1986年杭州大学化学系毕业，1988年、1990年分别在上海有机化学研究所获得硕士和博士学位，师从陆熙炎院士。1990-1992年在上海有机所任助理研究员、副研究员；1992-1997年分别在瑞士苏黎世联邦理工大学(ETH)和美国普渡大学(Purdue University，导师：Negishi教授)从事博士后...

报告介绍 Abstract: 　　We have performed large scale variational search for the best RVB ansatz for the spin-12 kagome antiferromagnet with both nearest-neighboring(NN) and next-nearest-neighboring(NNN) exchanges assuming only translational symmetry. We find the best RVB state is always fully symmetric and has an mean field ansatz that is gauge equivalent to a previous proposed Z2 spin liquid ansatz. The Z2 ...