报告介绍 Abstract： 　　Surface wetting phenomenon is of particular importance for applications of materials, it is also a central topics in physics, biology, material science, chemistry, geology, and nano science. Although the macroscopic wetting theory has been developed for centuries, it is still different to understand the wettability of surface on atomic level. We employed the molecular dynamics simulat...

报告介绍 Abstract： Hybrid ferromagnetic metal/organic interface, as known as “spinterface”, can exhibit highly efficient spin-filtering properties and therefore present a promising class of materials for future spintronic devices. The spin-polarization of spinterface at Fermi level can be different or even opposite in sign to that of adjacent ferromagnetic electrode. To ...

报告介绍 Abstract： 　　Bimetallic nanostructures of specific compositions and enclosed by certain facets can significantly alter their physical and chemical properties and thus provide the opportunities to tailor them for particular applications. Despite significant progress in recent years, it is still a grand challenge to control the spatial distribution of elements and surface structure of bimetallic nan...

报告介绍 Abstract：　　Quantum dots (QD) are quasi-zero dimensional structures with a unique combination of solid-state and atom-like properties. Unlike bulk or molecular materials, QD properties can be modified continuously by changing QD shape and size. Often, the bulk and molecular viewpoints contradict each other. The molecular view suggests strong electron-hole and charge-phonon interactions, and slow e...

报告介绍 报告摘要： 原位电子显微术通过对电镜中的样品施加外场刺激使得样品结构或形貌发生变化，同时利用透射电镜来研究样品变化的机制。这一技术的发展使得对静态物质的电镜研究发展到了对物质动态变化的观察。即使如此，所观察到的在电镜真空样品室中发生的物质变化与自然环境中的物质变化过程可能不尽相同，因为在自然环境中大部分物理、化学、和生物过程都发生在含有气体或液体的环境中。环境电镜正是为了解决这个问题而设计，通过对电...

报告介绍 Abstract：　　Human cardiovascular and brain activities produce extremely weak pulsed magnetic field strengths at sub-nanoTesla (nT) levels which travel via various nervous systems to deliver and exchange information between live biological systems. The ability to map weak magnetic field pulses in situ under ambient conditions will provide a unique window into live physiological processes. Meas...

报告介绍 报告摘要： Pt-Ni二元合金纳米颗粒可控制备及生长机理是获得与晶面取向相关的物理与化学性能的基础科学问题。原位液池透射电镜技术是研究纳米颗粒生长机理的先进技术。本报告介绍了采用原位液池透射电镜研究纳米Pt-Ni二元合金纳米颗粒的不同生长机理。报告人简介：　　郑立允，河北工程大学材料学院教授、院学术委员会主任，河北省有突出贡献的中青年专家、河北省“三三三人才工程”二层次。曾在美国特拉华大学从事博士后...

报告介绍 Abstract： When atomically thin two-dimensional materials are layered, they often form incommensurate noncrystalline structures that exhibit long-period moire patterns when examined by scanning probes. In this talk I present a methodology that uses information obtained from ab initio calculations performed on short-period crystalline structures to derive effective Hamiltonians that are able to effic...

报告介绍 Biosketch：　　Professor Qian Niu obtained a B.S. from Peking University in 1981. He went to the University of Washington for graduate studies, and received his Ph.D. in physics in 1985. Now he is a Trull Centennial Professor of Physics at the University of Texas at Austin, and an Adjunct Chair Professor at the International Center for Quantum Materials in Peking University. He has worked on the the...

报告介绍 Abstract： Spin is the fundamental electronic quantum degrees of freedom in solid state materials. In superconductors, Cooper pairs, as composed of two spin-1/2 particles, can have spin-1 angular momentum, leading to spin-triplet pairings. In this talk, we show that Majorana zero modes in solids has universal pure spin-triplet correlations for both time-reversal broken and respect topological superc...

报告介绍 报告摘要： 晶体管是现代历史中最重要的发明之一，是所有现代电器的关键主动元件。它的出现引发了现代社会的信息技术革命，对全球经济发展和人类进步产生了不可估量的影响。对于场效应晶体管来说，影响其性能的因素有很多，申请人将其归为三个方面：一方面是组成晶体管器件的材料，即半导体、金属和栅介质；另外一个方面是利用这些材料组成器件时，各个材料之间所形成的界面，即半导体/金属、栅介质/半导体和半导体/衬底之间的界面；...

报告介绍 Abstract： Low power is desirable for battery-powered electronics, such as mobile phone and internet of things (IOTs) devices etc. Spintronics is considered as an emerging technology that can offer this property based on its data non-volatility/fast operation/easy integration with CMOS. And spin transfer torque random access memory (STT-MRAM) has attracted much attention from academics and industrie...

报告介绍 Abstract： The maximum solar-to-electric power conversion efficiency of a conventional solar cell is determined by the Shockley-Queisser limit of ~33% [1]. In this lecture, I will discuss efforts in my group over the past a few years to explore photophysical mechanisms that may be used to exceed this limit [2]. The first approach is to create two electron-hole pairs from the absorption of one photon...

报告介绍 Abstract： The ability to directly probe ultrafast phenomena on the nanoscale is essential to our understanding of excitation dynamics on surfaces and in nanomaterials. Recently, a new ultrafast STM technique that couples terahertz (THz) pulses to the scanning probe tip of an STM was demonstrated (THz-STM), providing simultaneous 0.5 ps time resolution and 2 nm spatial resolution under ambient labor...

报告介绍 Abstract： The feverish research activity on lead halide perovskites has been fueled by their exceptional optoelectronic properties, e.g., in solar cells and light-emitting devices. Hybrid lead halide perovskites exhibit carrier properties that resemble those of pristine nonpolar semiconductors despite static and dynamic disorder, but how carriers are protected from efficient scattering with charged...

报告介绍 报告摘要： 随着同步辐射光源和自由电子激光的发展，x射线量子光学得到越来越多的关注，报告里提出了一种储存x射线脉冲的方法，这为以后的量子通信和量子计算提供了一种新的选择。References:Xiangjin Kong, WenTe Liao and Adriana Pálffy. Field control of single x-ray photons in nuclear forward scattering. New J. Phys. 16, 013049(2014).Xiangjin Kong and Adriana Pálffy. Stopping Narrow-Band X-Ray Puls...