报告题目：Optical investigation of 2D materials

报告人：于霆 教授

邀请人：程迎春 教授

报告时间：2022年6月15日（星期三）9:30

报告地点：科技D楼1903

摘要

Two-dimensional (2D) materials, such as graphene and monolayer transitional-metal-dichalcogenides (TMDs), have aroused great attention due to the underlying fundamental physics and the promising atomically-thin optoelectronic applications. Optical properties of these 2D materials are fundamentally interesting such as magneto-phonon resonance in graphene, patterned charge-phonon coupling in NbSe2 and strong excitonic emission in monolayer WS₂. Meanwhile, development of practical optoelectronics based on 2D materials is very promising, which opens many opportunities for the next-generation light-emitting applications such as valley light-emitting diodes and on-chip vertical-cavity surface-emitting lasers (VCSELs). Here, we report observations of magneto-phonon coupling effects in graphene layers, collective charge density wave (CDW) phases in 2H-NbSe2, wealthy excitonic emission states of monolayer WS₂, and 2D semiconductor lasing from monolayer WS₂ embedded VCSELs. Overall, our studies provide many new understandings on fundamental light-matter interactions in atomically thin materials and pave ways to develop industrially attractive light-emitting applications based on 2D semiconductors.

个人简介

于霆,武汉大学物理科学与技术学院教授，博士生导师，国家级人才项目入选者，国家重点研发计划“纳米前沿”重点专项首席科学家。2003年获新加坡国立大学博士学位，2003-2005新加坡千禧年博士后，2005年加入南洋理工，2017年获聘新加坡南洋理工大学正教授（终身职位），2020年回国加入武汉大学。于霆教授博士长期从事二维材料物性研究与性能调控，及其在微电子、光电子、光通讯和电化学储能等方面新型、高效器件的应用开发。尤其针对可用于新一代信息通信与存储的二维材料光学、光电特性等领域做出许多引领性工作。发表SCI论文300余篇，他引28,000多次，H因子93。