报告介绍 Biosketch:　　Professor Fuchun Zhang obtained a B.S. from Fudan University in 1968. He went to Virginia Polytechnique Institute and State University and received his Ph.D. in physics in 1983. From 1986 to 1988, he worked in ETH Zuerich, Switzerland as a Research Associate. He joined University of Cincinnati, USA as a faculty member in 1988. From 2003 to 2012, he served as a Chair Professor in the Un...

报告介绍 Abstract: 　　A microscopic formalism to calculate thermal transport coefficients is presented based on a thermal vector potential, whose time-derivative is related to a thermal force. The formalism is free from unphysical divergences reported to arise when Luttinger's formalism is applied naively, because the equilibrium 'diamagnetic' currents are treated consistently. The mathematical structure fo...

报告介绍 Abstract: 　　The spin-orbit coupling is at the heart of efforts for spintronics, which aims to use spin for information storage and logic applications. There are two extreme cases for it, namely large spin orbit coupling and low spin orbit coupling. For materials with large spin orbit coupling such as platinum (Pt) and iridium ? manganese (Ir-Mn), a pure spin current could be generated via the spin...

报告介绍 报告摘要： A highly competitive research environment with increasingly limited research funding has created a “Publish or Perish” attitude among scientists who are judged on the quantity rather than quality of their research articles. This presentation provides a brief overview of current trends and challenges in scientific publishing, some ethical considerations, how publishers and auth...

报告介绍 报告摘要： Colloidal quantum dots (CQDs), nanometer-scale semiconductor crystals capped with surfactant molecules and dispersed in solution, have provided a powerful platform for the development of numerous classes of solution-processed optoelectronic devices over the past decade, including photovoltaic cells, photodetectors, and light-emission devices. In addition to enabling solution processing, a...

报告介绍 报告人简介： 　　2004年获得复旦大学凝聚态物理博士学位，2004年到2009年在中国科学院物理研究所工作，先后任助理研究员，副研究员，2009年到安徽大学物理和材料学院工作，任副教授。主要研究方向为巨磁电阻材料和器件开发，纳米磁性多层膜的制备和性能，新型纳米技术材料的探索及其机理研究等。　　在凝聚态物理、氧化物钙钛矿材料的电磁特性与微结构以及低维材料探索与性能等研究中取得了有意义的进展。在国际有影响的刊物（如Phy...

报告介绍 报告摘要：The continuous downsizing of modern electronic devices implies the increasing importance of quantum phenomena. As the feature sizes of transistors inch towards 10 nanometer, simulations including quantum effects and atomistic details are inevitable. A novel hybrid quantum mechanics and electromagnetics (QM/EM) method is developed to model individual electronic components at the nanoscale. ...

报告介绍 报告摘要：　　由于电子/晶格/轨道和自旋自由度存在很强的相互作用，钙钛矿氧化物具有几乎涵盖了凝聚态物理中所有奇异的物理性质：高温超导、庞磁电阻、铁电、多铁性、重费米子等。钙钛矿氧化物的不同材料间晶格匹配高，便于构造异质结构，而且通过生长不同的钙钛矿结构可实现对其界面的调节和设计。在钙钛矿氧化物异质结构中，当材料的空间尺度接近电子之间相互作用的特征长度时，由于电子的强关联相互作用，就会出现电子态分布不均...

报告介绍 Abstract:　　Low temperature fuel cells are electrochemical devices that convert chemical energy directly to electricity. They have great potential for both stationary and transportation applications and are expected to help address the energy and environmental problems that have become prevalent in our society. Despite their great promise, commercialization has been hindered by lower than predicted...

报告介绍 报告摘要：　　科研行为大致可分为负责任的、不当的和不端的三类。科研诚信是负责任的科研行为最基本的和最重要的组成部分。近年来我国出现的许多学术不端问题，除了大环境的影响和研究者个人道德品质缺陷外，对于青年学生和研究人员也还存在不懂和不重视的问题。演讲者作为一些学术期刊的编委、国家基金委监督委员会成员、以及中国科协科技工作者道德与权益委员会委员，调查和处理过多个学术不端事件，其中有的广受公众关注。演讲者...

报告介绍 报告摘要： Spintronics is a field of general interest, which aims to utilize the spin degree freedom of electrons for novel information storage and logic devices. In this talk, I will discuss the spin dependent properties of graphene that make it a promising candidate material for spintronics. First part of my talk will answer the question: why graphene is a good spin channel material. I will presen...

报告介绍 Abstract:　　In this talk I will present our recent progress in scanning tunneling microscopy and spectroscopy investigations of emerging 2D materials beyond graphene, including topological insulators (TI) and transition metal dichalcogenides (TMDs). 　　The scientific interests of TI originate from its spin chiral topological surface state (TSS). However, it has been very difficult to create a...

报告介绍 Abstract:　　In monolayer haxagonal lattices, two inequivalent valleys appear in the Brillouin zone. With inversion symmetry breaking, we find chiral phonons with valley contrasting polarization and ionic magnetic moment. At valley centers, there is a three-fold rotational symmetry endowing phonons with a quantized pseudo angular momentum, which includes spin and orbital parts. From conservation of ...

报告介绍 报告摘要： Ever since its discovery the notion of Berry phase has permeated through all branches of physics. Over the past three decades it was gradually realized that the Berry phase of the electronic wave function can have a profound effect on material properties and is responsible for a spectrum of phenomena, such as polarization, orbital magnetism, various quantum, anomalous, or spin Hall effect...

报告介绍 Abstract: 　　Intrinsic spin-orbit coupling in graphene is relatively weak, some tens of micro eVs. On one hand, this is good, as the projected intrinsic spin relaxation is also slow, on the order of microseconds. On the other hand, a greater value for the spin-orbit interaction is desired for spin manipulation and spin-orbit induced phenomena, such as the spin Hall effect. In this talk I will revie...

报告介绍 Abstract:　　The deeper understanding of topology in physics has led to a new concept of physical objects - topologically ordered system. A topological insulator is an electronic material that has a band gap in its interior like an ordinary insulator but possesses conducting states on its edge or surface. The talk gives an overview about the emerging field of topological photonics and concerns the o...