Time: 14:00-15:30, Wed., September 11, 2024

Venue: E10-304, Yungu Campus

Host: Dr. Yao Yang, Assistant Professor, Westlake University

Language: Chinese

Speaker：

Prof. Junhao Lin

Department of Physics

Southern University of Science and Technology

Biography:

Dr. Junhao Lin obtained his PhD degree of Physics from Vanderbilt University, USA, in 2015. He had his postdoctoral work as a JSPS fellow in AIST, Tsukuba, Japan from 2015-2018, hosted by Dr. Kazu Suenaga, and continue the research mostly in 2D materials with low-voltage monochromatic S/TEM. He joined Department of Physics, Southern University of Science and Technology (SuSTech) in 2018 as a tenure-track associate professor, and was exceptionally promoted to tenured full professor in 2024. His main research direction includes analysis of complex defect structures in novel 2D materials, real time in-situ observation of the dynamical processes in structural transition of materials under various environmental stimulations, and the development of 2D ferromagnetic and ferroelectric materials. He has published more than 130 journal papers, including first/corresponding authored paper in Nature (3), Science (1), Nature Nanotechnology/Materials/Electronic/Synthesis (5) and etc., with a total citation of more than 15000 times, H-index 52 (GoS data).

Abstract:

Two-dimensional (2D) materials are considered to be the candidates for future nano-electronic, optoelectronic and spintronics applications. Understanding the structural origin of the novel physical properties in 2D materials serves as the key step for functionality engineering and improved performance in devices. In this talk, I will first show the quantitative intensity analysis of scanning transmission electron microscopy (STEM) imaging, revealing the atomic scale structure-properties correlation in emerging 2D materials. Secondly, I will introduce the universal strategy to overcome the structural degradation problem of air-sensitive 2D materials. We develop a home-built interconnected inert gas protection system compatible with atomic STEM imaging, and I will show the recent breakthroughs in structure-properties correlation of various air-sensitive 2D materials through quantitative intensity analysis. Examples including but not limit to: monolayer amorphous carbon where the high-density distorted defect network contribute to its ultrahigh mechanical toughness; intrinsic defect structures in air-sensitive WTe2/MoTe2 monolayer and their heterostructures with enhanced defect states; superlattice reconstruction in 2D ferromagnetic heterostructure with exotic magnetic responses, etc.

Contact:

zhusongmei@westlake.edu.cn