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学术报告


6月2日报告

发布时间:2015-06-01
报告题目:Electronic Transport and Device Applications of 2D Materials
报告人:南京大学缪峰教授
时间:6月2日(周二)下午2:30
摘要:During the last decade, tremendous research efforts have been focused on two-dimensional (2D) materials due to their rich physics and great potentials for many applications. Our group is now focusing on electronic transport, electro-mechanical properties, optoelectronic properties, and related device applications of various 2D materials, as well as related van der Waals heterostructures.
The first part of my talk will focus on the electro-mechanical properties of suspended graphene, which is the thinnest flexible conductive material. I will present the direct observation and controlled creation of one- and two-dimensional periodic ripples in suspended graphene sheets, using both spontaneously and thermally generated strains.We are able to control ripple orientation, wavelength and amplitude by making use of graphene’s negative thermal expansion coefficient and electrostatic force. The latest results on the layer-number dependent positive piezoconductive effect will also be discussed. 
The second part of the talk will cover our recent studies on atomically thin rhenium disulfide (ReS2) flakes with unique distorted 1T structure,  which exhibit interesting in-plane anisotropic transport and mechanical properties, as well as excellent optoelectronic properties. We fabricated mono- and few-layer ReS2 field effect transistors, which exhibit competitive performance with large current on/off ratios (~107) and low subthreshold swings (100 mV dec-1). The observed anisotropic ratio along two principle axes reaches 3.1, which is the highest among all known 2D semiconducting materials. We further successfully demonstrated an integrated digital inverter with good performance by utilizing two ReS2 anisotropic field effect transistors, suggesting the promising implementation of large-scale two-dimensional logic circuits. Our latest results on the ultra-high photoresponsivity phototransistors based on few-layer ReS2 with successful demonstration of weak signal detection will also be presented.
个人简介
缪峰,江苏海安人,南京大学物理学院和南京微结构国家实验室教授、博士生导师。2000-2004年在南京大学物理系学习,获理学学士学位;2004-2009年,美国加州大学河滨分校博士研究生,2009年获博士学位,并获最佳博士毕业生奖;2009-2012年在美国惠普实验室(硅谷总部)任助理研究员;2012年入选国家“青年千人计划”;2014年获江苏省杰出青年基金资助;现任科技部“量子调控”国家重大科学研究计划(青年科学家专题)项目首席科学家。
主要从事石墨烯、过渡金属硫族化合物为代表的新型低维材料的低温电子输运、光电性质、机械性能等基本物性的研究,以及相关功能电子器件在信息存储、逻辑运算、传感器等领域的应用基础研究。在石墨烯的电子弹道输运、超导电流传输、悬浮石墨烯的机电性质、基于硫化铼的场效应及逻辑器件、忆阻器(memristor)的工作机制及材料设计等研究上取得了一系列创新成果,多项工作在国际同行中产生重要影响。作为主要作者或通讯作者在Science、Nature Nanotechnology、Nature Communications、Physical Review Letters、Advanced Materials等国际权威学术期刊上发表论文,共发表SCI论文40余篇,总引用6000余次,H因子21;并申请新型材料及电子器件相关美国专利8项(已获授权4项),中国专利2项。