报告题目：Emerging physical properties of single-layer transition metal dichalcogenides

报 告 人：Prof. Yu Ye     School of Physics, Peking University

主 持 人：张立军 教授

报告时间：2017年12月5日 15:00

报告地点：南区唐敖庆楼D区429报告厅

主办单位：材料科学与工程学院

摘要：The single atomic crystal layer of transition metal dichalcogenides (TMDCs), with numerous exotic physical properties, has become a worthy successor to graphene. The TMDC undergoes an indirect to direct band gap transition when it is thinned down from bulk to single layer, due to the strong confinement. The single layer TMDCs hold large exciton binding energy and rich excitonic transition physics. The inversion symmetry breaking brings nonlinearity to the single layer TMDCs, making them good piezoelectricity and second-harmonic generation materials. Moreover, single layer TMDCs are found with nonequivalent valley degree of freedom, due to the inversion symmetry and strong spin-orbital coupling. In this talk, I will focus on our recent effort on probing the unique physical properties of single layer TMDCs and their potential applications towards two-dimensional on-chip optoelectronics.

Yu Ye obtained his Ph.D. degree in Physics from Peking University in 2012. Then, he worked as postdoctoral fellow at department of Mechanical Engineering, University of California at Berkeley from 2012 to 2016. He current holds an assistant professor position at School of Physics, Peking University. He is interested in the light-matter interactions and electrical properties of two-dimensional materials in condensed matter physics, with an emphasis on novel physical phenomena emerging in atomically thin materials, van der Waals heterostructures and surfaces/interfaces by nanoscale device designs, optical spectroscopy, electrical transport, and scanning photocurrent measurements.