报告介绍 报告摘要： The concepts of equilibrium and nonequilibrium steady states in a classical many-body system are introduced as mathematical concepts associated with stationary Markov processes. For both discrete stochastic systems with master equations and continuous diffusion processes with Fokker–Planck equations, the nonequilibrium steady state (NESS) is characterized in terms of several key not...

报告介绍 报告摘要：　　利用光聚合方法，制备了新型的“C/TiO2/C”复合纳米管和复合纳米带（厚度为2-3nm）光催化材料。这些复合光催化材料具有非常优异的促进光生电荷分离、抑制电荷复合的能力，在紫外区的表观量子产率(AQE)高于95%甚至接近100%。光解水产氢性能测试发现，“C/TiO2/C”复合纳米管材料在1个太阳强度的模拟太阳光辐照下，光解水产氢速率达37.6 mmol/h/g催化剂。同时材料还展示出优异的光催化活性稳定性。...

报告介绍 报告摘要： We will present our recent and ongoing efforts in exploring the intrinsic properties and applications of some important and representative inorganic nanographene analogues (IGAs), such as MoS_2 and BN, and the theoretical design of emerging IGAs with unusual chemical bonding.

报告介绍 报告摘要： 　　Recent developments in time-dependent Density functional theory (TDDFT)-molecular dynamics (MD) make it possible to explore excited carrier dynamics and its coupling with lattice dynamics at femtosecond time scale. This talk presents several recent examples to illustrate the significance of such a development [1]. First, we consider energy transfer of photoexcited carriers in hydrogen...

报告介绍 报告摘要：　　报告将报道我们在氧化物纳米团簇催化反应活性方面的最新研究进展。我们使用实验和理论相结合的方法，对低温下氧化物团簇上的甲烷活、一氧化碳氧化等重要反应进行了系统研究，得到了一系列具有较高反应活性的氧化物团簇以及它们的结构和反应机理。对大尺寸、多元氧化物团簇的研究，有助于模拟实际催化体系的基底效应和 尺寸效应。

报告介绍 报告摘要： Quantum confined semiconductor nanocrystals have emerged as a new class of light harvesting and charge separation materials in photovoltaic and photocatalytic devices. Compared with single component quantum dots (or “artificial atoms”), semiconductor nanoheterostructures (or “artificial molecules”), consisting of two or more component materials, offer additional op...

报告介绍 报告摘要： 　　Individual-based population dynamics articulates stochastic behavior of individuals and considers deterministic equations at the population level as an emergent phenomenon. Using chemical species inside a small aqueous volume (a cell) as an example, we introduce Delbruck-Gillespie birth-and-death process for chemical reactions dynamics. Using this formalism, we (1) illustrate the...

报告介绍 报告摘要： 　　Organic solar cells have the potential to spawn a new generation of light-weight, low-cost, and solar-powered products on thin and flexible substrates. Current energy conversion efficiency of 10.6% has been in reach. In this talk, I will discuss the engineering of active layer nanomorphology for improved charge transport in polymer solar cells via various acceptor loadings and so...

报告介绍 Abstract：　　The electrical current in a semiconductor can be carried by negatively charged electrons or positively charged holes. In undergraduate physics, we are often taught that holes in the valence band are just an absence of an electron. But they aren’t. Valence band holes are spin-3/2 particles, and this gives them very different properties to spin-1/2 electrons, particularly when conf...

报告介绍 Abstract: 　　While the topological order in two dimensions has been studied extensively since the discover of the integer and fractional quantum Hall systems, topological states in 3 spatial dimensions are much less understood. In this work, we propose a general formalism for constructing a large class of three-dimensional topological states by stacking layers of 2D topological states and introduci...

报告介绍 Abstract: 　　Interband cascade (IC) structures were originally introduced for achieving efficient mid-infrared (IR) lasers [1]. By taking advantage of the broken band-gap alignment in type-II InAs/Ga(In)Sb quantum wells to form interband cascade stages, IC lasers reuse injected electrons for photon generation with high quantum efficiency. Unlike intraband quantum cascade lasers, IC lasers use inter...

报告介绍 报告摘要： The consumption of fossil fuels creates energy shortage and serious environment issues, which limits sustainable development of the society. Solar energy is the most abundant renewable energy in the world. However, it needs to be stored as chemical energy due to its low energy density, uneven distribution and discontinuous radiation. Hydrogen is considered as a promising clean energy carr...

报告介绍 报告内容：　　石墨烯展现出优异的物理性质，是多科学共同关注的明星材料。对石墨烯的深入研究又推动了其他二维单层材料的发展。在当前二维材料的研究中，存在如下具有共性的关键科学问题：（1）原子是如何经由团簇的中间阶段聚集生长为二维单层？（2）在生长和器件应用中衬底的作用如何？（3）结构缺陷特别是晶界的存在对二维材料物理性质的影响如何？（4）怎样有效调控二维材料的能隙从而扩展其应用领域？近年来本课题组综合运用第...

报告介绍 报告摘要：　　Spin pumping has become one of the most important phenomena in spintronics. Yet, the theoretical work on the spin pumping remains limited to the original framework of the scattering approach which is more suitable for mesoscopic transport. For a disordered system, a natural approach is to utilize the linear response theory in which we reformulate the spin pump current in terms of spect...

报告介绍 报告摘要：　　Nanoparticles made of noble metals such as silver and gold exhibit strong optical absorption due to their surface plasmon resonance (SPR) that corresponds to the collective oscillation of surface conduction electrons in response to the incident electromagnetic waves. As the nanoparticles are smaller than 20 nm the interfacial quantum effect may take place to influence the SPR of t...

报告介绍 报告摘要：在过去的1-2年中，一种基于杂化钙钛矿吸光材料（CH3NH3PbI3等）新型薄膜太阳能电池引起了世界范围内的高度关注。此类电池效率在3-4年中从不到4%已快速上升到20%左右。虽然器件效率发展速度惊人，但许多关于钙钛矿的基础化学、物理、材料科研问题仍有待解决。此报告会先简单介绍一下钙钛矿太阳能电池，然后讨论我们在过去1-2年中在包括材料化学，器件物理，电荷在材料和器件中的传输等相关问题上的一些研究成果。