Twisted two-dimensional materials

Hyoung Joon Choi

Department of Physics, Yonsei University, Seoul, Korea

Abstract: Twisted layers of two-dimensional materials such as graphene and transition-metal dichalcogenides have emerged as a new platform of novel electronic structures. Since they have large moiré supercells typically, it becomes a challenge to perform accurate theoretical calculations of their electronic structures. Here, we present atomistic approaches to atomic and phononic structures of twisted graphene layers [1-3] and twisted transition-metal dichalcogenide layers [4-5], and discuss their atomic, electronic, and phononic properties [1-5].

[1] Y. W. Choi and H. J. Choi, Phys. Rev. B 98, 241412 (2018).

[2] Y. W. Choi and H. J. Choi, Phys. Rev. B 100, 201402 (2019).

[3] Y. W. Choi and H. J. Choi, Phys. Rev. Lett. 127, 167001 (2021).

[4] S. Y. Lim, H.-g. Kim, Y. W. Choi, T. Taniguchi, K. Watanabe, H. J. Choi, and H. Cheong, ACS Nano 17, 13938 (2023).

[5] S. Oh, H.-g. Kim, J. Kim, H. Jeong, H. J. Choi, and H. Cheong, 2D Materials 11, 025004 (2024).

Bio: Hyoung Joon Choi is Professor of Department of Physics, Yonsei University, Seoul, Korea. He received B. S. in Physics from Seoul National University in 1992, M. S. in Physics from Seoul National University in 1994, and Ph. D. in Physics from Seoul National University in 2000. He performed his postdoctoral research at Department of Physics, University of California, Berkeley as a Miller Research Fellow (2000-2003). He joined the faculty of School of Computational Sciences, Korea Institute for Advanced Study in 2003, and joined the faculty of Department of Physics, Yonsei University in 2005. He is President of Association of Asia Pacific Physical Societies (AAPPS) from 2023 to 2025. His research areas are computational studies of physical properties of solids and nanostructures, including exotic electronic structures, electronic transport, superconductivity, and magnetism.