时间：2025年5月23日（周五）上午10:00-11:30

Time：10:00-11:30, Friday, May 23, 2025

主持人: 西湖大学理学院郑昌喜博士

Host: Dr. Changxi Zheng, PI of School of Science, Westlake University

地址：西湖大学云谷校区E10-211教室

Venue: Room E10-211, Yungu Campus

语言：中文

Language：Chinese

代中伟博士

劳伦斯伯克利国家实验室

Dr. Zhongwei Dai

Lawrence Berkeley National Lab

主讲人/Speaker:

Dr. Zhongwei Dai holds a B.S. from Wuhan University (2010) and a Ph.D. from the University of New Hampshire (2018). His doctoral research focused on characterizing atomic structures of 2D materials using LEEM/µLEED-IV analysis. As a postdoctoral researcher at Brookhaven National Laboratory (2018–2021) and Lawrence Berkeley National Laboratory (2022–2024), he investigated quantum well states in twisted bilayer graphene and quasi-particle coupling in WS₂/moiré heterostructures, with his findings published in Physical Review Letters.

Dr. Dai is the recipient of the CFN Director’s Postdoc Award. He has presented his work at leading international conferences, including the LEEM-PEEM Symposium and the American Physical Society (APS) Annual Meeting.

讲座摘要/Abstract:

Study of ultra-small objects leads to fundamental understanding of the building blocks of our universe. Using this knowledge, we can now reconstruct and manipulate matter on the atomic level. Low Energy Electron Microscopy and Photoemission Electron Microscopy (LEEM/PEEM) is a powerful, quantum-principle-based technique that is critical to further our understanding of matter on the atomic level. I will present recent research results using two types of advanced LEEM/PEEM facilities for 2D materials atomic level characterization. First, I will show results of room temperature study of 2D materials using aberration corrected LEEM (AC-LEEM) and synchrotron light source equipped X-ray PEEM (XPEEM) in Brookhaven National Lab. These materials include semi-metal graphene and quasicrystal twisted bilayer graphene, semiconductor MoS2 and quantum spin liquid material RuCl₃. Then I will show results of 2D magnet and 2D superconductors using a newly developed cryogenic-spin-polarized-LEEM (Cryo-SPLEEM) at the Lawrence Berkeley National Lab. Finally, I will show study of 2D quantum heterostructure systems of WS₂/hBN and graphene/hBN using two different novel synthesis methods and basic characterization using low energy electron diffraction (LEED).

讲座联系人/Contact:

理学院，钟梦真，邮箱：zhongmengzhen@westlake.edu.cn

School of Science, Mengzhen Zhong, Email: zhongmengzhen@westlake.edu.cn