Young Hee Lee
Prof. at Sungkyunkwan Univ. (Korea), CAS Foreign Academician, PKU Guest Chair Prof.
Abstract
Ferromagnetism in van der Waals two-dimensional (2D) materials has been reported recently. Intrinsic CrI3 and CrGeTe3 semiconductors reveal ferromagnetism but the Tc is still low below 60K. In contrast, monolayer VSe2 is ferromagnetic metal with Tc above room temperature but incapable of controlling its switching via gating due to metallic nature. Moreover, the long-range ferromagnetic order in diluted metal chalcogenide semiconductors has not been demonstrated at room temperature. The key research target is to realize the long-range order ferromagnetism, Tc over room temperature, and semiconductor with gate tunability.
In this talk, we introduce magnetic dopant, vanadium in semiconducting WSe2 and manifest Tc at room temperature and gate tunability at low doping concentration. We further explore different doping concentrations including highly degenerate regime and demonstrate unconventional magnetic order by random telegraph spin noises via interlayer coupling and more recent progresses.
Speaker's Introduction
He has been a full professor of the Physics Department at SKKU, since 2001. He received Ph. D. from Kent State University in Ohio (1986) in physics. Prior to joining SKKU in 2001, Prof. Lee was a full professor in the Physics Department at Chonbuk National University since 1986. He was a visiting scholar at Ames Laboratory, Iowa State University in 1989, IBM, Zurich in 1993, and Michigan State University in 1996. He was a Director of Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) at SKKU in 2012-2023. He has been a fellow of Korean Academy of Science and Technology since 2007 and Academician, Chinese Academy of Sciences since 2021. Currently, he is a HCR distinguished professor at SKKU.
He serves for an Associate Editor of ACS Nano. He was awarded the first SKKU fellow in 2004 at SKKU, Science award from Korean Physical Society in 2005, Lee Hsun Research Award, IMR, Chinese Academy of Sciences, China in 2007, and Einstein Award IMR, Chinese Academy of Sciences, China in 2017. He was also nominated as a National Scholar by Ministry of Education in 2006. He got Sudang prize in 2015, Kyung Am prize in 2019, and Song-Bong prize in 2020. He was highly cited researcher (HCR) for 2018-2024.
