题  目：Interlayer excitons in van der Waals heterostructures: fundamentals and applications

关于范德瓦尔异质结中的层间激子的基础和应用研究

报告人：肖三水 副教授   丹麦科技大学

主持人：朱晓龙 研究员

时  间：2023年12月22日（周五）下午2:30

地  点：光学大楼B325会议室

报告人简介：

Sanshui Xiao obtained his PhD degree at Zhejiang University in 2004. In August 2004, he joined the Royal Institute of Technology as a post-doc researcher. In 2006, he started to work at the Technical University of Denmark, and he is now Associate Professor there. His current research interests include exploring the fundamental physics of light-matter interactions at the nanoscale and developing 2D materials-based optoelectronic devices. He obtained the European Optics Prize from the European Optical Society in 2008 and has been serving as the topical editor for Applied Optics (2017-2022).

肖三水，2004年获得浙江大学博士，同年加入瑞典皇家工学院做博士后研究，2006年加入丹麦科技大学，现在是丹麦科技大学副教授。他目前主要的研究方向是研究微纳尺寸下光跟物质的相互作用以及基于二维材料的新型光电子器件。他于2008年获得欧洲光学学会奖，曾担任美国光学协会应用光学的责任主编。

报告内容：

The appearance of the moiré period resulting from stacking atomic thin layers with rotational misalignment and/or lattice mismatch creates moiré superlattices, which have emerged as a unique platform for exploring novel physics, e.g., superconductor in the magic-angle superlattice, correlated insulator, and exciton localization. The formation of periodic energy potential traps in such a system strongly modulates existing excitonic states and their transport properties even at room temperature. I will first give a brief overview of recent activities/highlights in our group, e.g., graphene based silicon ring-resonator modulators, graphene plasmonic waveguide modulators, and graphene plasmonic waveguide photodetector. Then, I will mainly discuss two recent projects: (1) localization and interaction of interlayer excitons in MoSe2/WSe2 heterobilayers: addressing different trap mechanisms.  (2) observation of room-temperature moiré exciton in the MoS2/WSe2 system, the impact of moiré potential on excitonic light emission, and potential application for lasing at optical fiber communication O-band.

通过堆叠具有旋转错位和/或晶格失配的单原子厚度的二维材料，可以产生莫尔超晶格，它已成为探索新物理的独特平台，例如魔角超晶格中的超导体、相关绝缘体和激子局域化。即使在室温下，这种系统中周期性能量势阱的形成也会强烈调制现有的激子态及其输运特性。这个报告我首先简要概述我们小组最近的研究方向，例如基于石墨烯的硅环谐振器调制器、石墨烯等离子体波导调制器和石墨烯等离子体波导光电探测器。然后我主要讨论最近的两个项目：（1）MoSe2/WSe2异双层中层间激子的局域化和相互作用。（2）MoS2/WSe2体系中室温莫尔激子、莫尔势对激子光发射的影响以及光纤通信O波段激光的潜在应用。