Significance of Interlayer and Intralayer Interactions in 2D Materials
Date : March 12, 2025 16:00 ~
Speaker : 이관형 (서울대학교 재료공학부)
Professor : Prof. Sunghoon Jung, Prof. Joonho Jang, Prof. Yongjoo Baek
Location : 56동105호
Two-dimensional (2D) materials exhibit exceptional electronic, optical, and mechanical properties, which can be further tuned by controlling interlayer and intralayer interactions. While intralayer bonding dictates the fundamental properties of individual monolayers, interlayer interactions—particularly in van der Waals heterostructures and twisted multilayers—introduce new degrees of freedom that enable novel quantum phases and emergent physical phenomena.
In this talk, I will discuss our recent efforts in understanding and engineering these interactions to tailor the electronic structure, excitonic behavior, and ferroelectronic properties of 2D materials. Specifically, I will present our work on utilizing interlayer and intralayer reactions to fabricate fully commensurate (FC) structures and applying this approach to sliding ferroelectrics. Additionally, I will introduce our research on hypotaxy in 2D materials, where controlled growth strategies enable the fabrication of wafer-scale single crystal transition metal dichalcogenides (TMDs) with precise controllability of thickness and crystalline orientations. These methodologies provide new opportunities for manipulating sliding ferroelectronic properties and realizing advanced functional materials based on TMDs.
By leveraging interlayer twist angles, strain engineering, and external stimuli, we demonstrate how to precisely control these interactions to unlock new material properties. This research not only deepens our fundamental understanding of 2D materials but also paves the way for next-generation electronic and optoelectronic applications.