报告介绍 报告摘要:Sensors developed based on Guided-Mode Resonance (GMR) structure provide unique features that are suitable for detecting biological analytes. This seminar will discuss the GMR enhanced fluorescence assay that takes advantage of the strengthened evanescent field on GMR surface, where it interacts with the immobilized fluorescent biomaterials. The GMR enhancement capability significantly impr...

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报告介绍 Abstract: In semiconductor heterostructure, the Coulomb interaction is responsible for the electric current drag between two 2-d electron gases across an electron impenetrable insulator. For two metallic layers separated by a ferromagnetic insulator (FI) layer, the electric current drag can be mediated by a nonequilibrium magnon current of the FI. In this talk, I describe how an electron spin curren...

报告介绍 报告摘要:Carbon cage Fullerene molecules, like C60 found broad interest in basic research, after the discovery of an efficient way of production by Krätschmer and Huffman in 1990. Also in surface science Fullerenes became an important prototype molecular system, because it is relatively simple to produce well-defined structures, and rich physics has been found.The investigation of charge transf...

报告介绍 Abstract:Intermediate band photovoltaics hold the promise of being highly efficient and cost effective photovoltaic cells. Intermediate states in the band gap, however, are known to facilitate nonradiative recombination. Much effort has been dedicated to producing metallic intermediate bands in hopes of producing lifetime recovery -- an increase in carrier lifetime as doping levels increase. We show...

报告介绍 Abstract: Spin coherence and coherent spin transport are among the central issues of semiconductor spintronics. A host of optical studies have revealed a pronounced, nonmonotonic variation of the carrier spin lifetime with the doping level in GaAs, with a peak near the insulator-metal transition (IMT). While some aspects of these intriguing observations can be understood qualitatively based on the c...

报告介绍 Abstract：Gram-negative bacteriafrequently expel toxic chemicals through tripartite efflux pumps that span both the inner and outer membranes. The three parts are the inner membrane, substrate-binding transporter (or pump); a periplasmic membrane fusion protein (or adaptor); and an outer membrane-anchored channel. The fusion protein connects the transporter to the channel within the periplasmic spac...

报告介绍 Abstract:Semiconductor nanocrystals (also known as quantum dots, QDs) are solution processable, offering good photostability, high quantum yield, tunable and broad absorption, and narrow and tunable emission spectra. These properties make them promising materials for energy efficient lighting, low-cost photovoltaics, and biological sensing and imaging devices. Key elements that determine the optical...

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报告介绍 报告摘要：有限温度下材料性质的模拟，依据玻恩-奥本海默近似，要求人们对电子结构和原子核的运动分别进行准确的描述。近年来，随着第一性原理电子结构计算方法的发展，电子的量子描述已达到相当的精确度，而与之相应的原子核运动却很大程度停留在经典描述的层次。该处理所带来的一个直接后果是与原子核量子运动相关的量子隧穿、原子核有效势能面的修正、及高压下一些材料相图等基本物理问题不能被解释。在该报告中，我们将重点介绍...

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报告介绍 Abstract:The advance of Nano Science and Technology in recent years has helped create unprecedented opportunities to design and engineer structures at the quantum scale to realize novel material functionalities. As an example, advanced materials synthesis techniques such as molecular beam epitaxy (MBE) have enabled artificial engineering of low dimensional electronic systems that led to the discover...

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报告介绍 报告摘要: Bimetallic catalyst is one of the main categories of metal catalysts due to itstunability of electronic and geometric structures through alloying a second metal. The integration of a second metal creates many opportunities in varying surface structure and composition of metal catalysts toward a best catalytic performance.Fundamental studies of surface chemistry are critical for understandi...