报告介绍 报告摘要：Transition metals (TM) with partially-filled d electron shells form a series of compounds with a uniquely wide range of electronic, magnetic, elastic, and thermodynamic properties. These compounds can have a plethora of implications in electronics, semiconductors, optical switches, resistors, magnetic devices, superconductors, to name a few. The discovery of 2-dimensional (2D) mono-layered...

报告介绍 Abstract　　Coulomb charging and electronic doping are ubiquitous effects, which may profoundly affect various properties of low-dimensional nanostructures. In this talk, I will first review the concept of Coulomb explosion [1] and Coulomb sink [2], as two unique manifestations of charging on the stability and growth of metal nanoclusters in gas phase and on surface, respectively. I will then discus...

报告介绍 报告摘要： 　　In the past decade, as scaling of Si CMOS technology approaches its end, III-V and Ge are indentified as the high-mobility channel materials to replace Si beyond 10 nm node according to the newest ITRS. The rise of two-dimensional (2D) atomic-layer crystals, such as graphene, MoS2 and phosphorene, has also given unique opportunities and challenges to the device research. In this talk,...

报告介绍 报告摘要： Highly efficient chemical-electrical energy conversion has become the primary target for the development of renewable energy technologies such as water electrolyzers and fuel cells. Such energy conversion to a large extent relies on efficient electrocatalysts that are desired to be highly active, durable and cost-effective. Precious metals such as platinum (Pt) and iridium (Ir) are c...

报告介绍 报告摘要：　　Surface-enhanced Raman scattering (SERS) relies on the localized surface plasmon resonance and enhancement of electromagnetic fields around metal nanostructures to drastically increase the Raman scattering cross sections of molecules in close proximity to the nanostructures. It has been documented that Ag nanocubes embrace SERS properties with enhancement factors up to 106 at visible e...

报告介绍 Abstract　　We investigated two different structures of Li-based magnetic compounds by a first-principles algorithm based on density functional theory. The purpose is to investigate materials with large magnetic moments by expecting the Li atom to easily give up its electron and explore the conditions when these materials are half metals. 　　One class of compounds is in the form of the half Heusler...

报告介绍 报告摘要： 　　The relatively high efficiency of solar cells based on silicon (Si) has led them to dominate the solar cell industry for the past few decades. It is of current interest to develop the photon management with nanostructures since the ability to suppress the reflection and light trapping over a broad range of wavelengths and incident angles plays an important role in the performance of o...

报告介绍 报告人简介：A. Eychmüller教授是半导体物理化学领域的著名科学家，主要致力于亚微米至原子尺寸半导体材料的合成、结构及性质研究，在光电转换、传感电化学及生物技术等领域的应用，取得了许多优秀成果。现已在Nature Medicine, Nature Nanotechnology, Chemical Society Reviews, Angewandte Chemie-International Edition, Nano Letters, Journal of the American Chemical Society, ACS Nano, Advanced Materials等国际高水...

报告介绍 报告摘要： Using first-principles electronic-structure codes, a huge number of materials are being studied since some years. The amount of already created data is immense. Thus, the field is facing the challenges of “Big Data”, which are often characterized in terms of the “four V”: Volume (amount of information), Variety (heterogeneity of the form and meaning of the dat...

报告介绍 Abstract: 　　Cold atoms recently became the testbed for studies of spin-orbit coupling phenomena which cannot be seen in solids. It is well-known that spin-orbit coupling leads to a spin-coordinate entanglement producing mixed states in reduced spin subspace. We study two consequences of this entanglement for spin dynamics in Bose-Einstein condensates. First, spin-orbit coupling simulates a von Neu...

报告介绍 报告摘要： 　　Recent advance in nano-fabrication has made it possible to design and synthesize nanoparticles with nearly precise controls on nanoparticle sizes, shapes, compositions and structures for catalytic applications. In this presentation, I will summarize the common methods used to synthesize monodisperse nanoparticles. I will use Au- and Pt-based nanoparticles as examples to demonstrate th...

报告介绍 报告摘要： The advances in spintronics development demand on an element-specific and time-resolved magnetic measurement. Both have been realized by applying soft x-rays at synchrotron sources. In this talk, I will choose two examples to illustrate such applications. In the first topic, I will talk our ongoing experiment on time-resolved X-ray Magnetic Circular Dichroism (XMCD) to directly detect the...

报告介绍 报告摘要： 　　Thermoelectric materials can directly convert heat into electricity and vice versa. Such materials utilize the Seebeck effect for power generation and the Peltier effect for refrigeration. As the global energy crisis and environment pollution becoming more and more serious, the search for new thermoelectric materials is of important significance. In this talk, the thermoelectric prope...

报告介绍 报告摘要：　　The solar energy-driven photoelectrochemical (PEC) water splitting and photocatalysis have been continuing to drive substantial developments in new materials and methods for optimizing the energy conversion and utilization efficiency. Meanwhile, these studies have been inspiring research efforts in utilizing the PEC conversion platform to investigate the chemical/biological targets in ...

报告介绍 报告摘要： 　　Surface plasmon polaritons (SPPs) supported on noble-metal surfaces possess larger wavevectors than that of light at the same frequency from the visible to the infrared frequency range. Therefore, noble-metal nanostructures can function as near-field transducers to compress light below the diffraction limit and to realize diffraction-unlimited applications such as plasmonic nanoantenn...

报告介绍 Abstract:　　The first order semiclassical theory is a powerful and intuitive tool to understand the behavior of Bloch electrons (AHE, ANE, etc). The key ingredients are the orbital magnetic moment and Berry-curvature-induced anomalous velocity. However, the first order semiclassical theory is insufficient to derive various second order response functions. Here, I will introduce a semiclassical...