报告介绍

报告介绍 报告摘要：Titanium dioxide (TiO2) is one of the most widely used semiconductors in photovoltaics and photocatalysis because it is nontoxic, abundant, stable and photoactive. However, the wide bandgap, low electron mobility and short minority carrier diffusion length of TiO2 limit its quantum efficiency in these applications. In this talk, I will present a solution chemical approach for making TiO2 n...

报告介绍 报告摘要：To design materials with optimum properties and desired behavior, accurate descriptions of the underlying physics and chemistry of the materials are needed. Computer modeling combined with experiments play crucial and integrated roles, to provide detailed insight into structure, capture the structure-property-performance relationships, advance the understanding of experimental observations...

报告介绍 报告摘要： Computer simulations are used to study the unusual structure and dynamics of liquid/solid water at molecular scale. As an introduction, I calculate prototype water structures on metal surface. This study is further extended to silica surface, where a two-dimensional tessellation ice is observed. The new configuration is stable up to room temperature, because all the water molecu...

报告介绍 Personal statement:　　My research interest lies in quantum correlated physics in novel materials, such as oxide interfaces, topological insulators and superconductors, high temperature superconductors, and frustrated magnets. We develop innovative experimental tools to explore crucial signatures of novel phenomena in new materials. As a Ph.D. student at Princeton University, I invented a new techni...

报告介绍 报告摘要：　　In recent years, the interest in studying quantum-dot nuclear spin systems and their coupling to confined electron spins has been further fueled by its importance for possible quantum information processing applications. The fascinating nonlinear (quantum) dynamics of the coupled electron-nuclear spin system is universal in quantum dot optics and transport. In the first part of this ta...

报告介绍 报告摘要： A powerful approach for investigating properties of matter is light scattering. In this talk, I will discuss how light scattering is used to probe collective modes of electrons in two distinct systems. The first example focuses on light scattering from collective electron oscillations in metals called plasmons. We have recently proposed and demonstrated a novel three-dimensional orientati...

报告介绍 报告摘要：　　This talk focuses on different numerical methods for simulation of acoustic wave propagation in the areas of architectural acoustics and biomedical ultrasound. For architectural acoustics, the sound field modeling in long spaces is formulated using 1-D transport equations. Experiments obtained from a long room scale model are used to verify the transport equation models. In addition to...

报告介绍 报告摘要：　　In this talk, we discuss results from some recent theoretical studies on the novel electronic and optical properties of single-molecule junctions, graphene nanostructures, and surface states of topological insulators.  Owing to their reduced dimensionality and unique electronic structure, these systems present opportunities for study of unusual manifestation of concepts/phenomena ...

报告介绍 报告摘要： The potential-energy-surface crossings between different electronic state widely exist in photophysics, photochemisty and photobiology. At the crossing regions, the strong nonadiabatic couplings induces the ultrafast nonadiabatic transitions that play essential roles in many important photoinduced reactions. The simulation of such nonadiabatic dynamics represents a great challenging ...

报告介绍 报告摘要：　　拓扑绝缘体内部为绝缘体但边缘有导电态。这些边缘电子态具有拓扑保护、自旋偏振等特性, 在自旋电子学、量子输运等领域有着诱人的应用前景。当前理论计算和实验证实的拓扑绝缘体基本上都为化合物(如Bi2Se3、Bi2Te3)或合金(如Bi1-xSbx)材料。实验表明这些材料内部的杂质和缺陷态往往在输运过程中占主导地位, 严重限制了拓扑电子态奇异性能的发挥。单元素拓扑绝缘体有可能弥补化合物/合金材料的这些不足。借助量子受限效...

报告介绍 报告摘要：    In 1929, at the dawn of quantum mechanics, Paul A. M. Dirac stated that the physical laws for a large part of physics and the whole of chemistry are completely known. The challenge is to develop practical methods for explaining the features of complex atomic systems.   In this talk, we present a brief overview of some current theoretical and computational ...

报告介绍 报告摘要： Understanding cellular and organism functions requires studying the spatially resolved dynamics of protein networks. Föster Resonant Energy Transfer (FRET) imaging has long been established as the best method for detecting protein interactions and signaling events in living systems. FRET imaging of complex protein interactions requires an imaging method that can simultaneously detect...

报告介绍 报告摘要： 　　5d based iridates have recently attracted great attention due to the large spin-orbit coupling (SOC). It is now recognized that the SOC that competes with other relevant energies, particularly the on-site Coulomb interaction U, and have driven novel electronic and magnetic phases. Combining single crystal neutron and x-ray diffractions, we have investigated the magnetic and crystal st...

报告介绍 报告摘要：　　When establishing bio­lms, many bacterial species are able to move across surfaces in multicellular groups, a process known as swarming. Flagellated bacteria swarm within a thin layer of ‑uid. This micro‑uidic environment is critical to the physiology of swarming cells. We aimed to understand the interaction between swarming cells and the ‑uid layer. Using micron-...

报告介绍 报告摘要：　　Efficient injection of spin-polarized electrons from a ferromagnetic (FM) source into a semiconducting heterostructure is a prerequisite for the realization of semiconductor spintronic devices. However, due to the large conductivity mismatch between FM metals and semiconductors, direct deposition of the FM metal on the semiconductor surface will result in very poor spin injection effic...