时间：2019年7月12日，周五上午10：30-11: 30
报告人：新加坡A*STAR Zhang Gang教授
Thermal Properties of Nanomaterials: Something Unexpected but Physically Explainable
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.
Biography
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.
