清华大学材料科学与工程研究院《材料科学论坛》

学术报告

报告题目：New physics and applications of ?materials with metal-insulator transitions

报告人：Prof. Junqiao Wu (Department of ?Materials Science and Engineering, UC Berkeley)

报告时间：2019年5月25日（周六） 下午4:00

报告地点：清华大学逸夫技术科学楼A205学术报告厅

联系人：刘锴老师

欢迎广大师生踊跃参加！

报告摘要：
Metal-insulator transitions ?arising from electron correlation or lattice reconfiguration offer a ?unique window to probe solid state physics, as well as a platform to ?design novel devices. In this talk, I will show our recent discovery ?on novel thermal conduction physics in the charge-density-wave ?material tantalum disulfide, where an unusual, temperature-independent ?thermal conductivity is found and attributed to strong electron-phonon ?coupling that dominates over the conventional phonon-phonon ?scattering. I will also discuss how we engineer vanadium dioxide for ?novel device applications: by grading or meta-structuring its ?metal-insulator phase transition, we demonstrate ?temperature-indepdendent thermal radiation which is used for a ?superior infrared camouflage and decoy, high temperature-coefficient ?of resistivity for infrared detection, high sensitivity to ionic ?strength of solutions for chemically powered neumorphic computing, as ?well as switchable thermal radiation used for thermal imaging gradient ?enhancing and smart radiative cooling.

报告人简介：
Professor Junqiao Wu received a B.S. from Fudan ?University and a M.S. from Peking University, China. He obtained a ?Ph.D. degree from the University of California, Berkeley, and did ?postdoctoral research at Harvard University. He is currently a full ?professor at the Department of Materials Science and Engineering, and ?the Chair of the Applied Science and Technology Graduate Group at UC ?Berkeley, and also holds joint appointment at the Lawrence Berkeley ?National Laboratory. His honors include the 29th Ross N. Tucker ?Memorial Award, the US-NSF Career Award, the US-DOE Early Career ?Award, the Presidential Early Career Award for Scientists and ?Engineers (PECASE) from the White House, the Outstanding Alumni Award ?from Peking University China, and the Fellow of APS. The Wu group ?explores novel properties and applications of nanomaterials, phase ?transitions at the nanoscale, and optoelectronic, thermal and ?thermoelectric properties of electronic materials. Prof. Wu has ?published over 200 widely cited papers in these fields. For more ?details, visit https://wu.mse.berkeley.edu/.