Time: 16:00pm, 14th July, 2020

Speaker: Dr. Yijun Yu, Department of Physics, Fudan University

Abstract: 

Vast opportunities exist in correlated Two-dimensional (2D) materials: they feature a number of exotic phenomena such as charge density waves (CDWs), high-temperature superconductivity (HTS) and magnetism. However, experimentally extracting monolayers from bulk correlated materials and control their electronic properties turned out to be extremely challenging. In this talk, I will introduce the fabrication and control technique we developed in the past years and intriguing results we obtained in several 2D systems. In the model CDW material 1T-TaS2, we are able to control the phase transitions by thinning it down to the 2D limit or electrochemical gating. In itinerant magnet Fe3GeTe2, we observe intrinsic ferromagnetism in the 2D limit and the Curie temperature can be turned up to room temperature. In monolayer high-temperature superconductor Bi2Sr2CaCu2O8+, we obtain a phase diagram lack of dimensionality effect, which indicates that monolayer cuprate contains all essential physics of HTS.

Brief CV of Dr. Yijun Yu:

Dr. Yijun Yu is currently a Postdoc associate in Prof. Yuanbo Zhang’s group in Fudan University, Shanghai, China. He received his doctoral degree in 2018 in the same group. His current research interest is focused on transport properties of correlated 2D materials with an emphasis on controlled modulation of electronic structures.

Click to view the recorded report video►http://as.iphy.ac.cn/video_detail.php?id=27554