纳米尺度下的热输运：新奇纳米效应与物理模型

Thermal Properties of Nanomaterials:Something Unexpected but Physically Explainable

报告人：张刚教授（新加坡科技研究局A*STAR）

邀请人：李伟峰，13046031298

时间：2019年7月9日9点30分

地点：离子束二楼报告厅

Abstract

The conduction of heat is one of the fundamental energy transport mechanisms in nature. Traditionally, the phenomenon of heat conduction is believed to follow Fourier’s law, which has received great success in describing macroscopic heat transport and is widely accepted as a general truth. Here the speaker will demonstrate that phonons transport in one-dimensional nanomaterials superdiffusively, which leads to a size dependent thermal conductivity. In other words, Fourier’s law is not applicable in nano materials. Moreover, using silicon nanowire as example, different mechanisms to reduce thermal conductivity by phononic engineering will be presented. All these features combined together to make semiconducting nanowire a very promising candidate for thermoelectric device applications. Subsequently, the speaker will present their recent theoretical approach for modeling phonon transport in two-dimensional materials and nanoscale interfacial thermal transport.

报告人介绍：

Prof. Zhang received B. Sci and PhD in physics from Tsinghua University in 1998 and 2002, respectively. He is currently a senior scientist and capability group manager in Institute of High Performance Computing (IHPC), A*STAR, Singapore, which he joined in February 2013. Prior to his joining IHPC, he was a professor at Department of Electronics, Peking University. His research is focused on the energy transfer and harvesting in nanostructured materials. He has authored or co-authored more than 190 publications in the peer-reviewed international journals, including 28 published in prestigious journals with impact factor higher than 10, and 9 review articles including 1 in Review of Modern Physics. His H-index is 49 and total citation is more than 8900. He was awarded with an Outstanding Ph.D. thesis Award in Tsinghua University (2002) and Singapore Millennium Foundation Fellowship (2002-2004). He serves as technical committee member for IEDM, associate editor for Frontiers in Physics, guest editor for Advanced Functional Materials, Chinese Physics B and editorial board member for Scientific Reports.

张刚教授分别于1998年和2002年在清华大学获得物理学学士学位和博士学位，现任新加坡科研局（A*STAR）高性能计算研究所（IHPC）资深科学家和课题组PI。在加入A*STAR之前，张教授曾工作于北京大学电子系。研究方向是纳米尺度材料的能量传输过程。张教授在国际著名期刊上发表论文190余篇，其中28篇影响因子大于10，9篇为领域综述文章，1篇发表在物理领域顶级期刊《Review of Modern Physics》（IF= 38.296）上。H指数为49，总引用超过8900次。获得清华大学2002年杰出博士学位论文奖和新加坡千禧基金会奖（2002-2004）。张刚教授是IEDM的技术委员会成员，物理学前沿（Frontiers in Physics）的副主编，高级功能材料（Advanced Functional Materials）的客座编辑，Chinese Physics B and Scientific Reports的编委会成员。