报告介绍 Abstract: 　　First, I will introduce the itinerancy enhanced quantum fluctuation of magnetic moments in iron-based superconductors. We demonstrate the active role of electron itinerancy in modulating strong anisotropic quantum spatial fluctuation and tuning the ordered anti-ferromagnetic moments. This is performed by first integrating out the itinerant degree of freedom of a degenerate spin-fermion...

报告介绍 报告摘要： While a few large species within partially hydrolyzed aluminum solutions of the Keggin type have been isolated and structurally characterized (e.g., epsilon-Al13, delta-Al30, Na-delta-Al13), other known isomers, while speculated, have not yet been identified. The current work utilizes a novel synthetic method first enabling the synthesis of Keggin-type Al structures at high concentrations...

报告介绍 报告摘要： In this presentation, I will summarize surface science studies addressing a prototypical model oxide system – the rutile TiO2(110)–(1 × 1) surface. The identification of point defects on the terraces such as oxygen vacancies, hydroxyl groups, and near surface defect such as Ti interstitials will be discussed. Using high-resolution scanning tunnelling microscopy (STM) sev...

报告介绍 Abstract: 　　Spin photocurrents induced by optical excitation with circularly polarized radiation in semiconductors are reviewed. The absorption of circularly polarized light results in optical spin orientation due to the transfer of the angular momentum of photons to electrons, which causes a directed motion of electrons in unbiased semiconductors. A characteristic feature of this spin photocurren...

报告介绍 报告摘要： 　　Amorphous matter especially amorphous alloys （or metallic glasses）are currently among the most actively studied materials. In the last half century, the amorphous alloys, which is a newcomer in glassy family, is at the cutting edge of research and of current interest and significance in condensed matter physics, materials science and engineering. The unique structural features and o...

报告介绍 报告摘要： 　　The formation of chemical bonds depends strongly on the spatio-temporal conditions within an ensemble of starting molecules. We found that by using nanostructured surfaces on metallic single crystals, a significant increase of the reaction rate can be obtained, even with simple linear hydrocarbons exhibiting very poor chemical reactivity. By imposing appropriate self-organized nano-co...

报告介绍 报告摘要： 测定聚合物溶液的相图是项繁琐而细致的工作。将微流技术、荧光标记和激光光散射相结合，发展出一种快速、简便和可靠的聚合物溶液相图测定方法，这源于对基本要领的正确理解和深度把握。

报告介绍 报告摘要： 　　(1) a simple introduction , (2) the main points of the enhancemen by the local electromagnetic field (EM) at spherical silver particles. (3) the experimental evidence for SERS active sites of atomic dimensions . The average signal from the SERS active sites(SAS) mimics a non-genuine" first layer effect” which is often interpreted as “Chemical effect". (3) Th...

报告介绍 报告摘要： 　　While organic molecules are recognized for their strong nonlinear optical properties, the main challenge for applications is the need of developing a solid-state organic material that not only reflects the high optical nonlinearities of its molecular components, but that also has a high optical quality and can be easily and efficiently combined with current integrated optics technolog...

报告介绍 报告摘要： 　　This talk will present an overview of recent discoveries about singlet and triplet excitons and their interaction in rubrene, a molecular crystal currently under intense study as an organic semiconductor for electronic and optoelectronic applications. Photon absorption in this material directly results in the creation of singlet excitons, whose radiative recombination leads to a photo...

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报告介绍 Abstract: 　　There have been surging developments in the area of spin-orbit coupled quantum gases. In this talk, I will review the recent experimental and theoretical advances in understanding these fascinating many-body systems. Then I will turn to my current theoretical work on spin-oribt coupled quantum gases. Finally I will conclude with some interesting directions and some challenging problems...

报告介绍 报告摘要：　　Nanobubbles on hydrophobic surfaces can be imaged using Atomic Force Microscopy and are implicated in the very long-range attraction measured between hydrophobic surfaces. However, the widely accepted theory of bubble dissolution predicts that small bubbles under the influence of Laplace pressure should rapidly dissolve resulting in bubble lifetimes of less than a second. Such short li...

报告介绍 报告摘要： Nanopore detector is considered as a promising candidate for the third generation DNA sequencer for $1000 genome. Tremendous progresses have been made for improving the sensitivity of nanopore sensors toward this goal. Nonetheless, there are still several profound and intrinsic challenges for achieving this goal. One is to prepare electrical probes with single-base resolution. The other i...

报告介绍 报告摘要： Because atoms and molecules are small in size and fast in motion, it is difficult to visualize them directly and probe their microscopic motions, which precludes a microscopic understanding on dynamics of condensed matter, such as phase transition kinetics and collective vibrations (normal modes). In contrast, micrometer-sized colloidal particles can serve as good model systems for these ...

报告介绍 报告摘要： 　　Manipulating light on the nanometer scale is a challenging topic not only from a fundamental point of view, but also for applications aiming at the design of miniature optical devices. Nanoplasmonics is a rapidly emerging branch of photonics, which offers various means to manipulate light using surface plasmon excitations on metal nanostructures. Here I will talk about our recent stud...